UNCLASSIFIED ENGINEERING... · 2020. 5. 18. · Course USA No. 2C6389 Vehicle USA No. 2C6388 Gravel 100 Hilly cross-country Level cross-country Marsh, swamp, and woods Belgian block

UNCLASSIFIED

Aoi?4140L

ARMED SERVICES TECHNICAL INFORMATION AGENCY ARLINGTON HALL STATION ARLINGTON 12, VIRGINIA

UNCLASSIFIED

NOTICE: When government or other drawings, speci- fications or other data are used for any purpose other than in connection with a definitely related government procurement operation, the U. S. Government thereby incurs no responsibility, nor any obligation whatsoever; and the fact that the Govern- ment may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or other- wise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use or sell any patented invention that may in any way be related thereto.

euelofunettt OHX& P'iool SesuUceA.

1

ASTIA AVAILABILITY NOTICE

U. S. Military Agencies rray obtain copies of this report directly from ASTIA. Other qualified ASTIA users should request through Aberdeen Proving Ground, Md. ATTN: ORDBG-DPS

Destroy when no longer needed. DO NOT RETURN.

This is an official Aberdeen Proving Ground technical report; hovever, the findings herein are not to be construed as a final Department of the Army position.

»

FOREIGN ANNOUNCEMENTS AND DISSFMINVTICN OF TH» REPORT BY ASTIA IS LIMITED ^

DEVELOPMENT AND PROOF SERVICES ABERDEEN PROVING GROUND

MARYLAND

AUTHORITY: SM0TA-REC.2 JCGilkey/HKillian/cjz

FIRST PARTIAL REPORT ON PRODUCTION ENGINEERING

TEST OF XM28 AND XM29 WEAPON SYSTEMS INSTALLED

ON TRUC^ UTILITY, l/^-TON, kxh, M151

Report No. DPS-775

Dates of Test: 30 August to 2 November 1962

ABSTRACT

The XM28 weapon system mounted on an M151 vehicle was subjected to road tests and firing tests at Aberdeen Proving Ground and was found to be gen- erally satisfactory. The test of the XM29 weapon system mounted on an M151 vehicle was terminated almost immediately after initiation at the direction of ATAC. The XM29 weapon system secondary vehicle was subjected to a road test and was found to be generally satisfactory.

It is recommended that the adapter kit for mounting the XM28 weapon system on the M151 vehicle be considered generally satisfactory for either vehicle operation or weapon firing provided the redesigned mounting bracket is used.

The XM29 weapon system secondary vehicle be considered acceptable as a support vehicle for that system.

The firing safety limits prescribed be adopted to minimize vehicle damage.

1

I "1

CONTENTS

PAGE

INTRODUCTION 7

DESCRIPTION OF MATERIEL 7

DETAILS OF TEST . .- 9

Automotive Tests 9

Artillery Phase . 10

CONCLUSIONS 17

RECOMMENDATIONS 18

REFERENCES 20

APPENDIX A: CORRESPONDENCE A-l

APPENDIX B: TEST PLAN B-l

APPENDIX C: LABORATORY REPORTS C-l

APPENDIX D: PHOTOGRAPHS D-l

APPENDIX E: FIRING RECORD ....... .,.-. . . . E-l

APPENDIX F: DISTRIBUTION F-l

1

TRUCK, UTILITY: 1/4-Ton, 4x4-, M151 With XM28 Weapon System Installed

BRAKES: ................. Internal Expanding, Hydraulic CREW: Two(2) CRUISING RANGE; 300 mi. DIMENSIONS 0/A;

Length...... 133-1/2 in. Width 71 in. Height 66-1/2 in.

ELECTRICAL SYSTEM: 21; volt ENGINE: Pour cylinder, liquid cooled, valve-in-head,

II4.I.5 cu. in., 71 HP at I4.OOO RPM, 128 lb. ft. torque at 1800 RPM.

FUEL CAPACITY: 17.7 gal. GROUND CLEARANCE: 9-l/8 in. STEERING: Worm and Double Roller SUSPENSION: Independent, coil spring, modified

for this increased payload. TIRE SIZE: 7.00x16 TRANSMISSION w/Transfer Case:

4. Forward speeds and 1 reverse TRANSMISSION GEAR RATIOS: Gear Ratio 1— -377TI

2 3.16:1 3 1.67:1 k 1:1 R 7.5:1

TREAD: Front , 53 in. Rear 53 in.

TURNING RADIUS: Right 16 ft. 7 in. Left 17 ft. 2 in.

WEIGHT w/o CREW: Right Front.. 710 lb. Left Front t>65 lb. Right Rear B25 lb. Left Rear °95 ib«

TOTAL 2895 lb.

Figure 1: Characteristics Photograph.

TRUCK, UTILITY: 1/4-Ton, 4x4-, M151 With XM29 Weapon System Installed

BRAKES: Internal Expanding, Hydraulic CggCn Two (2) CRUISING RANGE; 30O mi. DIMENSIONS O/A:

Length 163-1/2 in. Width 72-1/2 in. Height 66 In.

ELECTRICAL SYSTEM; 21+ volt ENGINE: Four cylinder, liquid cooled, valve

in-head, 141.5 cu. in., 71 HP at I4.OOO RPM, 128 lb. ft. torque at 1800 RPM.

FUEL CAPACITY: 17.7 gal GROUND CLEARANCE: 9-1/8 in. STEERING: 7 Worm and Double Roller SUSPENSION: Independent, coil spring, modified

for increased payload. TIRE SIZE: 7.00x16 TRAMSMISSION w/TRAflSFER CASE:

I4. forward speeds and 1 reverse. TRANSMISSION GEAR RATIOS: Gear Ratio

__ -^F.x 2 3.18:1 3 1.67:1 k 1:1 R 7.5:1

TREAD: Front 53 in. Rear 53 in.

TURNING RADIUS: Right 16 ft. 7 In. Left 17 ft. 2 In.

WEIGHT DISTRIBUTION w/o CREW: Right Front.. 690 lb. Left Front 615 lb. Rieht Rear 1005 lb. Left Rear 735 lb.

TOTAL 30L(.b lb.

Figure 2: Characteristics Photograph.

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TRUCK, UTILITY: 1/4-Ton, 4x4, Ml51 (XM29 Weapon System Secondary Vehicle)

BRAKES Internal Expanding, Hydraulic CREW Two (2) CRUISING RANGE; 300 ml. DIMENSIONS O/A;

Length 136 In. Width 63 In. Height 65 in.

ELECTRICAL SYSTEM; 21+ volt ENGINE: Pour cylinder, liquid cooled, valve-in-head,

11+1.5 cu. in., 71 HP at l+OOO RPM, 12b lb. ft. torque at 1800 RPM.

FUEL CAPACITY; 17.7 gal. GROUND CLÜÄRTTACE; 9-1/8 in. STEERING; Worm and Double Roller SUSPENSION; Independent, coll spring TIRE SIZE;. 7.00x16 TRANSMISSION w/TRANSFER CASE;

..................... 1+ Forward speeds and 1 reverse TRANSMISSION GEAR RATIOS;

TREAD

Gear

2 3 k R

Ratio Trrn 3.18:1 1.67:1

1:1 7.5:1

Front 53 in. Rear 53 in.

TURNING RADIUS: Right 16 ft. 7 Left 17 ft. 2

WEIGHT w/o CREW; Right front.. 635 Left front 670 lb. Right rear 615 lb. Left rear 595 lb.

TOTAL 2515 lb.

in. in.

lb.

Figure 3: Characteristics Photgraph.

1 INTRODUCTION

The adaptation of the XM28 and XM29 (Davy Crockett) weapon systems on truck, utility: l/k-ton, Kxh, M38AI, was previously tested at Aberdeen Proving Ground and found to be generally satisfactory (References 1 and 2). The Ml£l, however, is replacing the M3ÖA1 as the 1/^-ton utility truck in the Army vehicle system. It was therefore necessary that the XM28 and XM29 weapon systems be adapted for use on the MI5I vehicle.

ATAC installed the XM2Ö and XM29 weapon systems on two M151 vehicles using preproduction models of the planned adapter kits. A third vehicle was equipped to serve as the secondary, or support, unit for the XM28 system.

The three vehicles were delivered to Aberdeen Proving Ground for perform- ance and firing tests to evaluate the adequacy of the installation on these vehicles. The planned test programs for the XM28 system and the XM29 secondary vehicle have been completed. The test program for the XM29 primary vehicle was terminated almost immediately after initiation of the performance phase because of a pending redesign of the adapter kit. This report covers the testing of the XM28 system and the XM29 secondary vehicle.

The testing of the XM29 weapon system primary vehicle will be conducted after redesign of the adapter kit is completed and will be covered in a later report.

DESCRIPTION OF MATERIEL

2.1 General

The three M151 vehicles used for these systems are standard with the exception of a rear suspension overload kit installed on each of the two primary vehicles. This kit consists of the following changes and additions to the standard vehicle:

a. Larger rubber rear suspension arm bushings.

b. Higher strength steel in rear suspension arms.

c. Six-bolt mounting in lieu of the standard ^-bolt mounting of the rear suspension arms.

d. One additional bump stop for each rear suspension arm.

e. An additional coil spring for each rear suspension arm, concentric with and inside the standard coil spring.

. 1 2.2 XM28 Weapon System

The following items comprise the XM28 weapon system (Figure l) as mounted on the M151 truck:

a. XM63E1, 120-mm recoilless gun.

b. XM131, 120-mm vehicle mount.

c. XM28 vehicle adaption kit for stowage of:

6

7

8

9

10

Aiming circle.

XM120 mount tripod.

Two 120-mm launching pistons.

Four 120-mm propellant containers.

Ramming staffs,

XM28 fire control sight unit.

Aiming stakes.

Aiming stakes night-lighting devices.

Two projectiles, ballistic shape.

Mount, tolecr >;>o, KM! 17.

2.3 XM29 Weapon System

The following items comprise the XM29 weapon system (Figure 2) as mounted on the M151 truck:

a. XM64E2, 155-mm recoilless gun.

b. XM121, 155-mm upper carriage.

c. XM29 vehicle adapter kit for stowage of:

1) Aiming circle.

2) XM121, 155-mm mount tripod.

3) Two 155-mm launching pistons.

k) Four 155-mm propellant containers.

5) Ramming staffs.

6) XM29 fire control sight unit.

7) Aiming stakes.

8

8) Aiming stakes night-lighting devices.

9) Two projectiles, ballistic shape.

10) Mount, telescopic, XM117.

2.k XM29 Weapon System Secondary Vehicle

The secondary vehicle (Figure 3) is equipped with:

a. One projectile, ballistic shape.

b. One 155-nun launching piston.

c. Two 155-mm propellant containers.

d. One box 37-mm spotting rounds.

3. DETAILS OF TEST

3.1 Automotive Tests

3.1.1 Weight Distribution and Center of Gravity. Weight distribution and centers of gravity of all three vehicles were determined with the weapon system components in the stowed or travel position. Details of this data are included in Appendix C.

3.1.2 Vehicle Performance. The XM28 system vehicle and the XM29 second- ary vehicle were operated over various courses to evaluate their performance with the unusual type of payload. The mileage accumulated on each vehicle is shown in Table I.

Table I. Operation Summary, miles

XM28 System Vehicle XM29 System Secondary Course USA No. 2C6389 Vehicle USA No. 2C6388

Gravel Hilly cross-country Level cross-country Marsh, swamp, and woods Belgian block Paved road

Total test miles i+92 555 a Fifty miles of level cross-country operation was substituted for the 50 miles

of marsh, swamp, and woods requested on the XM29 system secondary vehicle. This substitution was made because the payload of this vehicle was not in ex- cess of normal payloads for the M151., therefore, performance should not be different from that of an M151 loaded with cargo.

1

98 100 153 150 100 a155

36 0 50 50 55 100

I 1 3.1.2.1 Performance Characteristics. Performance of the M151> l/^-ton

truck vas definitely affected by the installation of the XM28 -weapon system and the rear suspension overload kit. The weight of the system is not an excessive payload, although the distribution imposes a relatively high center of gravity. The spare tire and spare tire shield protrude from the side of the vehicle, and the weapon itself projects up and away from the normal dimen- sions of the fully equipped truck.

Uperation on unpaved, level, and hilly cross-country roads was affected to the extent that rear wheel side slippage was evident when nego- tiating slightly tight turns at moderate speeds.

Operation through densely wooded areas indicated that overhang- ing branches and bent tree trunks are capable of interfering with the weapon, hindering motion of the vehicle and causing damage to the system (Figures k through 6).

«a; gp»~*

H\ftn«>

Figure h; Accumulation of Brush on Weapon System.

Figure 5: Vehicle Movement Hampered by Tree.

Figure 6: Weapon System against Tree.

10

.1

1 Trees are also capable of interfering vith the spare tire pre-

venting movement of the vehicle (Figure 7).

It is difficult to determine precisely -what effect the addition of the weapon system has on mobility. However, the vehicle bogged down and was immobilized during operation in swampy terrain (Figure 8).

Figure 7: Spare Tire Striking Tree.

Figure 8: Vehicle Immobilized in Swampy Terrain.

3.1.2.2 Defects. A visual inspection of the XM28 system vehicle (USA No. 2C6389) after completion of the road tests revealed a crack in the right rear wheel housing portion of the body (Figure 9). The crack was adjacent to the forward edge of the bracket which supports the weapon and apparently was caused by the weight of the weapon increasing the stress at this point. Continued operation would have resulted in further cracking and buckling of the metal in this area.

Figure 9: Crack in Right Rear Wheel Housing of Vehicle No. 2C6389.

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■ l'fl

It was recommended that the weapon mounting bracket be modified to extend the full length of the wheel housing for increased rigidity. No sheet metal repairs were made pending reconsideration by the design agency.

There was no visible damage to the XM29 secondary vehicle (USA No. 2C6388) during the road test.

3.1.3 Extended Road Test of Modified Gun Mounting Bracket. The crack in the wheel housing of vehicle Wo. 2C63Ö9 C1*^ Va-T- 3.1.2.2), prompted a deci- sion by ATAC to redesign the gun mounting bracket. A bracket of the new design was fabricated and delivered to Aberdeen Proving Ground for replace- ment of the original bracket on this vehicle (Figure 10). Installation was made after completing the firing tests and repairing the vehicle damage caused by these tests.

A road test was conducted to evaluate the adequacy of the modified mounting bracket. The mileage accumulated on each course is shown in Table II.

1

Figure 10: Modified Gun Mounting Bracket, XM28 System.

Table II. Summary of Operations

Course Miles

Belgian block 100 Perryman cross-country 802 Paved l6k

Total IO66

An inspection of the modified bracket and related area at the com- pletion of the mileage disclosed no defects.

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3.2 Artillery Phase

3.2.1 Blast Effects on the Vehicle and Stability.

3.2.1.1 General. Firings consisted of ^1 excess pressure rounds with 9-pound charges of propellant, M5, MP, 0.040-inch web, lot HPC-132^5, fired for blast effects from XM63EI gun No. 209, mounted on the truck, utility, l/k-ton, kxk, MI5I0 These rounds were fired using both internal slugs(draw- ing No. FB51486) and XM5E1 launching pistons with external masses (drawing No. FCT0313> modified with adapters to fit XM5E1 pistons). These excess-pressure charges were used to achieve the highest chamber pressure conditions and, con- sequently, blast pressures which might be encountered in the field,

3.2.1.2 Preparation for Firing. The vehicle was prepared for firing by removing from the truck items needed to fire one round;

a. One launching piston.

b„ One propelling charge,

c. One porta-pack containing one projectile,

d. Sight unit consisting of telescope mount, XM117, No. 58, and elbow telescope, XM107, No, 58,

e. Aiming stakes and aiming circle.

In addition to the above items, the windshield was removed from the vehicle for most of the firings to prevent damage by blast and/or dis- placement of stones and debris resulting from reflected back blast. A hill composed of bank gravel was constructed for slope firings and the vehicle was positioned at various cants on the slope (Appendix A).

3.2.1.3 Facilities and Material, The following facilities and material were used to record data;

a. High-speed camera, 16-mm, to pictorially record any muzzle motion,

b. Motion-picture camera, 128 fps and 2k fps. to obtain an over- ail view of vehicular stability.

c. Still photographs of vehicle before and. after firing each round.

d. Gunner's quadrant to obtain gun elevations before and after firings,

e. Sight unit consisting of telescope mount, XM117, No, 58, and elbow telescope, XM107, No, 58, to determine tube throw-off after firing each round.

.13

. 1

3.2.1. If Traverse Measurements. Traverse was measured from 0° (gun parallel to the longitudinal axis of the vehicle, muzzle forward) with the gun mounted on the right side of the vehicle (Figure U). No right traverse firing was conducted because the gun, when traversed right, is too close to the vehicle to permit sight access to the gunner standing on the ground.

Figure 11: Definition of Direction of Traverse.

3.2.1.5 Results. A summary of the results of thiB phase follows:

a. The M151 vehicle is considered satisfactory as a firing platform and carrier for the XM28 weapon since the mechani- cal operation of the vehicle was not hindered by blast pressures, and it exhibited satisfactory stability.

b. Depending ongun orientation, the user must expect vehicle damage from the blast effects on the sheet metal body of the vehicle from repeated firings. It should be noted at this point that the XMS3EI, 120-mm recoilless gun is a high- trajectory weapon, producing relatively high levels of re- flected back-blast pressure from the ground.

c. Blast pressures from the XM63EI recoilless weapon has little or no effect on the chassis and engine assembly of the M151 vehicle. However, the body assembly will fatigue after it has been subjected to repeated firings. No significant damage to the on-vehicle equipment was observed.

Ik

1 Each gun position fired during this test simulated the worst conditions that could be expected under field con- ditions, and sheet metal fatigue was undoubtedly acceler- ated over normal usage in the field. Photographs of results of the blast-effects test are contained in Appendix D. It is recommended that the weapon be fired in the general areas shown by Figures 12 and 13 with precautions as stated in paragraph 3.2.1.6. When firing at gun elevations between 10° and 25°, the nozzle area between A and B (Figure 12) will afford traverse positions that will minimize muzzle or nozzle- blast damage.

i 150-

Figure 12: Elevation (A -

Recommended Positions for Firing between 25° and 10° ', B - 150° left Traverse).

When firing at gun elevations between 25° and k5°, the nozzle area between A and B (Figure 13) will afford the best trav- erse positions for minimizing reflected nozzle-blast damage to the vehicle.

Trammel-point measurements of the XM131 mount were taken during the firings of the XM28 system on the M38AI (Refer- ence 2). Therefore, it was not deemed necessary to repeat these measurements in this test. However, trammel points were measured four different times during the test and a maximum change of 0.25 inch was noted (Appendix C).

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1

Figure 13: Recommended Positions for Firing between 25° and ^5' Elevation (A - 0°, B - 122.7° Left Traverse).

3.2.1.6 Discussion. The recommended elevation limits are referenced to level ground. When firing within the recommended positions, the wind- shield and projectile porta-packs should be removed as precautionary measures. Should the recommended firing positions be exceeded, it is suggested that all on-vehicle equipment be removed.

In addition to precautions unique to firing from a vehicle, the general precautions for the weapon should be observed. Personnel should take a position to the side of the weapon and as distant as the extended firing cord, low energy detonating cord (LEDC), will permit. This distance is not constant. The cord may have slack left in it but, to minimize mal- functions, it should not overlap itself. It will not be capable of maximum extension at low temperatures because of stiffness of the coiled length. When firing,the face should be turned away to avoid any possibility of in- jury from flying particles of LEDC. All personnel should position them- selves so they are no more vulnerable to injury from the LEDC than the one who initiates it.

Following these precautions should prevent all but minimum damage to the vehicle. If there is slight deviation from them, it is probable that only minor damage would result. However, if the suggested maximum gun elevation and traverse were slightly exceeded in firing one round (as in an emergency) the vehicle could suffer severe body damage although it might not be disabled.

16

-71 Because of time limitation and the fact that the kit was assembled

to the vehicle when it arrived at Aberdeen Proving Ground, it was necessary to omit the test requirements outlined in paragraph 3.3.2a, sections 1 through k, of the test plan (Appendix B).

3.2.2 Elevation Tube Slippage Study. During testing of the XM131 mount on the M38AI, difficulty was encountered in obtaining a positive lock to hold the elevation tube rigidly (Reference 2). A new type production collet was fabricated by ATAC and was used during this test. Slippage of the elevation tube continued and was measured for each round fired. It varied, allowing an elevation change from a minimum of 0 mil to an exceptional maximum of 50 mils independent of elevation or traverse conditions. The use of external masses rather than internal slugs seems to make little or no difference in the amount of tube slippage. An approximate average change in gun elevation from tube slippage was approximately 15 mils, which is not considered excessive. This change can be easily corrected with the fine elevation adjustment mechanism (Appendix E).

3.2.3 Muzzle Motion Study. A study of muzzle motion was made to determine if any movement related to blast effects on elevation tube slippage occurred prior to piston exit. The results of this study showed no motion occurred in the vertical plane prior to piston exit. Thus, the range accuracy of the weapon would not be affected by this mounting.

k. CONCLUSIONS

It is concluded that:

a. The adapter kit for mounting the XM28 weapon system to the M151 vehicle is adequate for 1000 miles of vehicle operation and weapon firing provided the redesigned gun mounting bracket is used (ref par. 3).

b. The XM29 weapon system secondary vehicle is adequate for 500 miles of operation (ref par. 3.1.2.2).

c. The M151 is a stable firing platform for the XM28 weapon system (ref par. 3.2).

d. Depending on gun orientation, the user can expect vehicle damage from the effects of repeated firing. This damage should not im- mobilize the vehicle (ref par. 3.2.1.5).

e. Although some movement occurs in the elevation tube because of inadequate locking of the collet lock, the slippage which occurs is not considered serious enough to warrant any change in design (ref par. 3.2.2).

17

1 High-speed motion pictures of tube movement versus round exit show no tube movement before round exit and some slight movement after round exit. Therefore, the system accuracy is not affected by any elevation tube slippage which might occur (ref par. 3.2.2).

Minimum damage will be incurred by the vehicle when the weapon is fired within prescribed safety limits (ref par. 3.2.1.5).

RECOMMENDATIONS

It is recommended that:

a. The adapter kit for mounting the XM28 weapon system to the M151 be con- sidered satisfactory for vehicle operation and weapon firing provided the redesigned mounting bracket is used.

b. The XM29 weapon system secondary vehicle be considered acceptable as a support vehicle for that system.

c. The elevation and traverse firing limits, as outlined in this report, be adopted to minimize damage to the vehicle.

d. The M151 vehicle be considered a stable firing platform for the XM2Ö weapon system.

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APPROVED!

Lt Col, Ord Corps Deputy Director for Engineering Testing Development and Proof Services

~1 SUBMITTED:

•J. GILKEt Test Director

MI. KILLIAN Capt, Ord Corps Test Director

REVIEWED:

C. F. WATERS Chief, Wheeled Vehicle Branch

J. D. FARRELL Acting Chief, Mortar and Recoilless Rifle Branch

W. A, GROSS/JR. Chief, Automotive Division

H.A.'BECHTOL Chief, Artillery- Division

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REFERENCES

Zitz, J. S. and Correll, David R. "Vehicular Test of the XM29 Weapon System Mounted on Truck, Utility, l/k- Ton, kxk, M3ÖA1." Aberdeen Proving Ground. Report No. DPS-216, June I961.

2. Salvino, J. T. "Davy Crockett Weapon Systems on M3ÖA1 and M3TB1 Vehicles." Aberdeen Proving Ground. Report No. DPS-53O, June 1962.

20

J l

1

APPENDICES

PAGE

COREESPONDENCE A-l

TEST PLAN B-l

LABORATORY REPORTS C-l

PHOTOGRAPHS D-l

FIRING RECORD E-l

DISTRIBUTION F-l

1 COPY/cjz APPENDIX A

Correspondence

TEST DIRECTIVE

1. OBJECT: Evaluation of XM28 and XM29 weapon systems installed on truck, utility, 1/k ton, hxk, M151.

2. INTRODUCTION: Kits are being fabricated by Ordnance Tank-Automotive Command to mount the XM28 and XM29 weapons to the M151 vehicle. Engineering tests are required to determine the adequacy of the installations prior to re- lease of the equipment for production. Testing is required in the following areas:

a. Vehicle performance with the increased and redistributed loads.

b. Vehicle stability as affected by firing of the weapon.

c.i Stability of stowed components.

d. Effects of muzzle and reflected back blast upon the vehicle and stowed equipment,

3. ENGINEERING TESTS AND EVALUATION:

a. Testing

(1) Durability: Testing and evaluation shall consist of determining satisfactory performance of the equipment without malfunction. Subsequent to and during testing, investigation be conducted to reveal con- ditions of premature failure.

(2) Vehicle Evaluation: Vehicle testing and evaluation shall be limited to that which is required to determine the acceptability of the weapon system installation and the possibility of adverse conditions being imposed upon the vehicle body and chassis.

(3) Vehicle Stability: The vehicle chassis shall be instrumented to measure displacement vs time during and immediately after projectile launch- ing. Measurements shall be taken while firing five (5) rounds at each position of azimuth and elevation.

(h) Vehicle Performance: A mobility test shall be conducted to evaluate performance of the vehicles over the following types of terrain:

Miles

100 150 100

50 50 50

Type Course

Grave1 Cross Country (Hilly) Cross Country (Level) Mar sh-Swamp-Wo od s Belgian Block Paved Road

Location

Munson Churchill Perryman Munson Munson To and from courses

A-l

1 copy/cjz

(5) Blast Damage Assessment! One hundred (100) test slugs and fifty (50) subcallber rounds shall be fired from the vehicles. Weapons shall be fired from various azimuth positions and maximum and minimum elevation. Fifty (50) XM28 slugs and fifty (50) XM29 slugs with propellant cartridges, twenty-five (25) XM28 and twenty-five (25) XM29 spotting rounds will be provided by APG. Vehicles shall be fully stowed during this operation.

(6) Acceleration of Stowed Projectiles: Measurements shall be recorded with projectiles mounted in M151 vehicles.

k. TEST PLAN: The preparation of a test plan by Aberdeen Proving Ground, DSPS, shall include all detailed requirements essential for the proper testing and evaluation of the equipment. The formal test plan shall be forwarded for concurrence of this Command.

5. TEST PERIOD: Prototype testing shall commence on or about 27 August 1962 and will be completed prior to 5 October 1962.

6. MODIFICATION OF EQUIPMENT: No modifications to test items will be per- mitted without concurrence of the project officer, OTAC, or his authorized representative.

7. PHOTOGRAPHY:

a. Still photographs shall be taken of the following:

(1) All vehicle and component failures and corrective repairs.

(2) General photographs of the front, top, sides, and rear views.

b. Movies shall be taken of firing preparation, firing, and firing effects.

8. REPORTS: Upon commencement of testing, monthly memorandum reports and a final report will be required.

9. DISTRIBUTION OF REPORTS: Two copies of each report (item 8) shall be forwarded to the following:

a. Ordnance Tank-Automotive Command.

b. Ordnance Weapons Command.

c. Picatinny Arsenal.

d. Frankford Arsenal.

e. Watervliet Arsenal.

f. Ordnance Ammunition Command, ATTN: XM28 - XM29 Project Officer.

A-2

1 COPY/CJZ

10. CLASSIFICATION: Reports shall be unclassified where possible.

11. PRIORITY: A priority of 1A should be assigned to this test. If such a priority cannot be assigned, it is requested that this Command be so notified.

12. EQUIPMENT: Provisions of all XM28 and XM29 weapon system equipment, including vehicles, shall be arranged by OTAC.

13. VEHICLE CHARACTERISTICS: The following characteristics shall be determined: Gross weight; weight distribution; over-all dimensions; center of gravity; any safety devices required, minimum safe elevation and traverse condition.

A-3

i1 DK«wAc/202U0

»ADI i or PiflF.i

t 1 WORK ORDER

3 Aug 62 t. MCUKI

Commanding General Aberdeen Proving Grd

FROM: Res & Engr Directorate ATAC, SMOTA-RPF

S. OMS CBOI

J. 55>K0.12.533G0.03.0l*v»

». OMS Tl Til

APC Application

7. »UTH. OATl

2215

t. «FT. COOK t. UNI | TIM INDICATOR

B*

JO,. P ION. MM

CusT* a rv [mui JMAHIN wa. IDOVCD

1ft) 3 1R129 01 21» >n» DN

II. ACCOUNtlKS. CU ••■! M C»IIOK Of JUNOI (TO If) >*0< KllLlKI

2! x2Q*»0>*w*-3663^9-P5530-***-l8-O01 It. rcaroNUAMcc or THE FDUOIINS eoaa if AUTNOIIIKD ISUDJCCT TO «VAIIAOILITV or FUNOI)

APC Application*******

JOB 63-1 T. PTögram Authority Is provided for testing the XH28 & XH29 Adaption Kits

Installed on Truck, Utility, \/k Ton, kxk, H151 In accordance with Test Plan sub- mitted by APG/D&PS, subj: XH28 & XH29 Weapons Systems Installed on Truck, Utility« IA Ton, kxk, Ml 51.

2. Estimated time of performancet A. Start: 27 August 1962 B. Complete: 5 October 1962

3. Project Engineer: Mr. A. Pacholskl, SM0TA-REC.2, Ext. 3-Mlft).

13. QUANTITATIVE AMD CHANGE DAT*

a. ELEMENTS b. U/H c. OTY (Units) d. UMIT PRICE e. Total Cost

Prior Inc rease

Decrease

Current

Tolerance

N/A

N/A

000,000

000,000

000,000.000

000,000.000 None

14. TtKIT DATl rO« OOLI CATION

"228o! <

15. DISTRIBUTION DATA Rl INV. M«.

DOC. M STOCK OR PART NUMBER QUANTITY DOCUMENT NUMBER

I DENT t FSC Fl IN AOO

S

SUPPL. FNO 01 ST PROJ). RE0" 0 u UNIT PRICE jj . _»*.— ._ a uj , *—

FLS„ . WO-ER DATE SERTÄT * . *D°""S * «•« £°"- 8 8 u i 0OLLARS CTS -3 2 ££5 T'0N 2 DATt 5 . «B |2 8 as s : a 5 o«

r"

16. DESIRED DELIVERY SCHEDULE

ENTER DATE •

OTY

17. AUTHORIZED BY

R. FREEMAN ef. Program Office II. INCLOSURES

None,

qj£ A0S 20 APR 1962 ?0 A-fc> Amy-OTAC- Detroit

1

IKsxlstaJMm WORK ORDER

f««-, RT 555 Res & Engr Directorate ATAC, SMOTA-RPF

1. DATI MirAiie

29 Aug 62 t. Mciwui riiinn

99

Commanding General APG, D&PS

5. OMS cote

CMS 5530d2„533G0o02o01 •. OMS T I TL I

APC XM28 XM29/KL51

7 . AU TH. OA T I

2241

a. «M. COOt 9. LINE I TIM INDICATOR

B

10; MON, Nl

CU»T' » PY laiBtAL »IUIIN Nu. LSÜJLlSJtlkkl

14 3 1R129 02 24 DN

tt. ACCOUNTING CL »III P I CATION OP PUNO» (TO II) MAOC A V AI L A tl I

21x2040-*»*-3663409-P5530***-18-001

It. FdirOJIUAHCC Or THE rOUOUMi SOSS II AUTHORIZED (IUIJICT TO AVAIIAIILITY OP PUNOI)

APC XM28 XM29/M151

This amendment is issued to provide additional program authority for the following and to change the CMS Code in Block 5 of the basic document from 5530»12»533G0„03=01 to 5530o12o533G0„02o01 as indicated above0

Job 63-l„ Amendment 1

1» The basic order is amended to include the procurement of twenty-five (25) major caliber rounds using prototype pistons and external slugs to replace twenty-five (25) major caliber rounds using internal slugs„

2» The purpose of this procurement is to subject the gun to the actual firing conditions in order to evaluate the merits of the elevation lock on the XM131 Mount»

3. Target Completion Date; One (1) Month from receipt of this authorization» 4o All other teams and conditions remain in effect»

13. QUANTITATIVE AND CHANGE DATA

a, ELEMENTS 0. U/H C, QTV (Units) d. UNIT PRICE e. Total Cost

Prior Increase Decrease Current Tolerance

NA NA

NA

00,000 00,000 00„000

000,000,00 000,000.00

000,000»00

Type of Buy None

14. TAA6CT OATE POR 0ILI6ATI0N

2274 15. DISTRIBUTION DATA Rl INV. MGR.

DOC. H STOCK OR PART NUMBER QUANT ITY DOCUMENT NUMBER

I DENT t FSC

S

FUN ADDT-L; REO'ER DATE SERIAL *

SUPPL. FND OIST PROJ>- REO'O UI UNIT PRICE UJ

o u o § DOLLARS CTS

5- mm 3 u u ae O (9 < X

16. DESIRED DELIVERY SCHEDULE

ENTER DATE *

OTT

17. AUTHOR I ZED BY

R„ A„ MCDONALD

IB TYPED KÄME • TITLE

R. A. McDONALD, Act'g Ch„ Financial Contrö I» INCLOSURES

AOS 20 APR 1962 ?0 A-5 Amv-OTAC- Detroit

s 1

WNf£UAi2 FOR AMSTE-DPS-Tl(, MB. GlLKEY>a\D MS LEFEVRE APS

I0R AMCPM-DC, LT COL RQDcERS AND MR • L« LENZ USARWCj FOR MAJOR TIPP

USAIB, FROM SMQTA-REC«2, A«L« PACHOUKl , SCD L. St LUDWIG

CONFIRMING TELECON BETWEEN MR« GlLKEY, APG, AND MR • PACHOLSlU,

ATAC, IT IS REQUESTED THAT ALL TESTING, REPEAT, ALL TESTING OF THE

IM 29 KIT INSTALLED ON THE Midi PRIMARY VEHICLE ONLY BE SUSPENDED

UNTIL FlRTER NOTICE« TEST AT FORT BENNlNG REVEALED DEFICIENCIES

3GINFICANT IN MAGNITUDE TO WARRANT MODIFICATION AND/OR REDESIGN

OF THIS KIT INSTALLATION

BT

CFN TT to**Z AMSTE-DPS-TU AMCPM-DC USAIB SMOTA - REC.2 XM29 MIS*

*5/2t28Z RUCMEE

A-6

1 COPY/CJZ

PChase/is/25118

WORK ORDER

Date Prepared: 26 Oct 62. Document Priority: 99. To: Commanding General Aberdeen Proving Ground. From: RI EH, Res & Engr Directorate ATAC, SMOTA-RPF. CMS Code No.: 553O.12.533G0.O2.O1. CMS Title: APC XM28 XM29 Authority Date: 2299. RPT Code: B. Line Item Indicator: N.

PRON NR

FY Serial No. Amen NR Buyer Seller

3 1R129 03 EH KI

Accounting Classification of Funds (to be) Made Available: 21x2040-***- 3663^09 ~P5 5 30*-**-18-001

Performance of the Following Work Is Authorized (Subject to Availability of Funds):

APC XM28 XM29/M151

Job No. 63-I, and Z

1. D&PS is requested to include the performance of a 1000 mile mobility test on M1.51 vehicle with redesigned weapon mounting bracket for XM28 weapon system at no increase in program authority.

2. Estimated date of completion: 15 November 1962.

3. All other instructions remain unchanged.

Target Date for Obligation: 2319. Type of Buy: 2.

Authorized By: ft/ R, A. McDonald.

Typed Name & Title: R. A. McDonald, Actg Ch, Financial Control Branch.

A-7

-1

APPENDIX B

Test Plan

PRODUCTION ENGINEERING TEST PLAN

XM28 and XM29 Weapon Systems In- stalled on TRUCK, UTILITY: £-Ton,

4x4, M151

Project DA_

OMS

May 1962

J. C. Qllkey

Automotive Division Development and Proof Services

Aberdeen Proving Ground Maryland

B-l

1

TABLE OF CONTENTS

Production Engineering Test Plan

XM28 and XM29 Weapon Systems Installed on TRUCK, UTILITY: £-Ton, 4x4, M151

Subject Paragraph

No. Page No.

PROJECT IDENTIFICATION 1 2

PROJECT DESCRIPTION 2 2

Introduction 2.1 2

Objective 2.2 3

Description of Material 2.3 3

TEST PROCEDURES 3 3

Initial Mechanical Inspection 3.1 3

Characteristics 3.2 3

Adequacy of Weapon System Kit 3.3 4

Performance 3.4 5

Vehicle Stability as Firing Platform 3.5 5

Effect of Blast on Vehicle 3.6 6

REPORTS 4 6

SCHEDULE 5 9

REFERENCES 6 9

B-2

.

AUTOMOTIVE DIVISION DEVELOPMENT AND PROOF SERVICES

ABERDEEN PROVING GROUND MARYLAND

DRAFT OF PRODUCTION ENGINEERING TEST PLAN

1. PROJECT IDENTIFICATION

1.1 Subject; XM28 and XM29 Weapon Systems Installed on TRUCK, UTILITY: £-Ton, 4x4, M151

1.2 Project Number; Unasslgned

1.3 Type of Test; Production Engineering

1.4 Cognizant Agency; Ordnance Tank-Automotive Command

1.5 Authority; (a) OMS

(b) Letter,ORDMC-REV, dtd 30 Mar 62, Engineering Test Directive

1.6 DA Priority: 1A

1.7 Classification; Test Plan - Unclassified Reports - Confidential

1.8 Project Assignment: J. C. Gllkey, Wheeled Vehicle Branch

2. PROJECT DESCRIPTION

2.1 Introduction

The XM28 and XM29 Weapon Systems installed on TRUCK,

UTILITY: £-Ton, 4x4, M38A1 were tested previously at Aberdeen

Proving Ground and found to be satisfactory. The M151* however,

is replacing the M38A1 as the £-ton utility truck in the Army's

vehicle system. It is therefore necessary that the XM28 and

XM29 Weapon Systems be adapted for use on the M151.

?

B-3

1

Teats are required to determine the adequacy of the in-

stallations prior to release for production.

2.2 Objective

Determine the adequacy of the XM28 and XM29 Weapon Systeme

Installed on the M151 truck with particular emphasis on: (a) ve-

hicle performance with the increased and redistributed loads,

(b) vehicle stability under firing conditions, and (c) effect of

muzzle blast and reflected back blast upon the vehicle and stowed

equipment.

2.3 Description of Material

Unavailable at this time.

3. TEST PROCEDURES

3.1 Initial Mechanical Inspection

OPM 60-25 (9 Mar 60)

3.1.1 Purpose. To determine any shipping damage to the equip-

ment and ensure that all components are functioning normally before

starting the test.

3.1.2 Method. Perform mechanical inspection checking all

components for proper functioning. Make necessary adjustments.

3.2 Characteristics

OPM 60-15 (31 Oct 56)

3.2.1 Purpose. To record the characteristics of the vehicle

for comparison with similar Items.

3.2.2 Method.

a. Physical dimensions of the vehicle with mounted

equipment will be obtained and recorded.

3

b. Vehicle load distributions and ground pressures will

be taken and recorded.

c. Center of gravity will be determined.

3.3 Adequacy of Weapon Systems Kit

3.3.1 Purpose. Determine operating characteristics, capabilities,

and limitations of the Weapon System kit, (static, pre-flre con-

ditions).

3.3.2 Method.

a. Assemble and disassemble the kit and weapon to the

vehicle. Ascertain the following:

(1) Weight of various components.

(2) Ease of assembly and disassembly with, and without

arctic handgear.

(3) Tools required to accomplish task.

(4) Time required to accomplish tasks.

(5) Ease of loading and operation of weapon within

tactical requirements.

(6) Adequacy of kit.

b. Make physical measurements as followsJ

(1) Establish trammel references on kit and vehicle

as required.

(2) Height of weapon at 0° elevation from level

ground.

(3) Material soundness (magnaflux) of mount com-

ponents before and after firing tests.

c. Take photographs as follows:

(l) General view of components.

4 B-5

(2) General views (front, rear,top and side) of

vehicle with system installed.

3.4 Performance

3.4.1 Purpose. Determine the effect of the mounted equipment

on vehicle operating characteristics.

3.4.2 Method. Observations will be made while operating the

vehicle with mounted equipment over the following types of terrain:

Gravel 100 miles

Cross-Country (hilly) 150 miles

Cross-Country (level) 100 miles

Marsh - Swamp - Woods 50 miles

Belgian Block 50 miles

Paved Road 50 miles

3.5 Vehicle Stability as Firing Platform

3.5.1 Purpose. Determine the suitability of the vehicle as

a firing platform.

3.5.2 Method.

a. Obtain tube displacement data (2 prototype, 2 slugs

and 2 minor) (Fire one each at gun elevation of 195.6 and 800 mils).

(1) Tube displacement versus time in horizontal and

vertical utilizing one Fastex camera from side.

(2) Ascertain horizontal and vertical tube displace-

ment until shell exit and gun throw-off as result of firing.

b. Determine vehicle stability (8 slugs and 8 minor).

(1) Fire at various elevations and traverse positions.

(2) Hop cards on vehicle.

(3) Ascertain vehicle movement during firing and

gun throw-off as result of firing.

c B-6

~]

71

3.6 Effect of Blast on Vehicle

3.6.1 Purpose. Determine the extent of damage to the vehicle

by firing of the weapon.

3.6.2 Method.

a. Complete the following tasks with vehicle on level

ground (10 slugs).

(1) Fire one round at various gun elevations and

traverse positions, beginning at the position estimated as least

likely to cause damage.

(2) General motion picture coverage (128 fps) and

still pictures.

(3) Ascertain:

(a) Limits of gun elevation and azimuth least

likely to cause vehicle damage.

(b) Assessment of vehicle damage.

(c) Blast pressures at various locations on

the vehicle (drivers, gunners, etc.) using paper blast gauges.

(d) Durability of gun mount.

b. Repeat the above with the vehicle positioned on a

front, rear and side slope of approximately 15° (30 slugs).

4. REPORTS

4.1 Me mo ran dum Re po rt s.

0PM 60-391 (30 June 1961)

Memorandum reports will be submitted bi-monthly unless

excessive delays are anticipated in which case the suspension

of reports will be explained in the preceding report. Distribution

B-7

\ 1

will be made to:

Addressee No. of Copies

Commanding General Ordnance Tank-Automotive Command Detroit Arsenal Center Line, Michigan ATTN: ORDMX-AL

ORDMX-LC ORDMC-KEC ORDMC-REO ORDMC-REM 0RDMC-REW.1 ORDMC-R ORDMC-RRC ORDMC-PMC ORDMC-FMW ORDMC-LT ORDMC-IF.l ORDMC-IF.5 ORDMC-WS ORDMC-REV

1 2 1 1 1 2 1 1 1 2 1 2 2 1 1

Chief of Ordnance Department of the Army Washington 25, D.C. ATTN: ORDTW-TVS

ORDIT ORDFM

2 1 1

CONARC Liaison Office Aberdeen Proving Ground, Md,

Commanding Officer USA Ord Test Activity Yuma Test Station Yuma, Arizona ATTN: ORDBG-TA-ET-AU

Commanding General Ordnance Weapons Command Rock Island, 111.

Commanding General Picatinny Arsenal Dover, New Jersey

B-8

1 Addressee No. of Copies

Commanding General Frankford Arsenal Philadelphia, Penna. 2

Commanding General Watervllet Arsenal Watervliet, N. Y. 2

Commanding General Ordnance Ammunition Command Rock Island, 111. ATTN: XM28 - XM29 Proj Officer 2

4.2 Formal Technical Report

OPM 60-390 (30 Jun 196l)

A goal of 30 days is established for submission of a

formal technical report after completion of testing. Copies of

reports will be distributed in the number of copies to the

agencies listed in 4.1 and to:

Addressee No. of Copies

British Army Staff 3100 Massachusetts Ave, N.W. Washington 8, D.C. THRU: 0C0, ORDGU-SE 2

Canadian Army Staff 2450 Massachusetts Ave., N.W. Washington 8, D.C. THRU: 0C0, ORDGU-SE 2

Armed Services Technical Information Agency Arlington Hall Station Arlington 12, Virginia 10

Diamond Ordnance Fuze Laboratory Washington 25, D.C. ATTN: ORDTL-012 1

8

B-9

1

Addressee

Commandant, U. S. Marine Corps Washington 25, D.C. ATTN: A0-4H

President Marine Corps Equipment Board Quantico, Virginia

Navy Liaison Office Aberdeen Proving Ground, Md.

Technical Library Aberdeen Proving Ground, Md.

No. of Copies

1

1

1 - Vellum 1 - Reference 1 - Record

5. SCHEDULE

5.1 Start

Scheduled for 2y Aug 1962.

5.2 Completion

Estimated 5 Oct 1962 assuming no abnormal delays from

exoessive maintenance, lack of parts, etc.

6. REFERENCES

6.1 Corre spondence

Letter, ORDMC-REV, dated 30 March 1962, Subject:

Evaluation of XM28 and XM29 Weapon Systems Installed on TRUCK,

UTILITY: i Ton, 4x4, M15L

6.2 Reports

APG DPS-216, June 1961 "Vehicular Test of the XM29

Weapon System Mounted on TRUCK, UTILITY: £■ Ton, 4x4, M38AI."

9

B-10

-J APPENDIX C

Laboratory Reports

ABERDEEN PROVING GROUND, MARYLAND

AUTOMOTIVE ENGINEERING IABORATOHY REPORT

PROJECT »0: l/A ska DATE: 26 Stptrabor 1962 REPORT NO: 62-9$

WEIGHT DISTRIBUTION CHARACTERISTICS

AMD CENTER OF GRAVCTf LOCATIONS OF TRUCK,

UTILITr, lA TON, kXk, ML51, USA REQ. HO.

2C6388, 2C6369 AND 2C6391 WITH XM2Ö

OR ggg WEAPON SYSTEM PATL0AD8

DATES OF TEST: 20 and 2i S*ptamb«r 1962

TABLE OF CONTENTS

PAGE NO.

1. INTRODUCTION 2. RESULTS 3. DETAILS OF TEST

2 2 thru k

k

INCLOSURE

1 Summary Data ShMt So. 62-95-1

C-l

1. INTRODUCTION

1.1 Object Of Tost

To determine the weights and erattr of gravity locations of the 10.51 Trucks with tha XM28 or XM29 Weapon By sterna.

1.2 References

Automotive Engineering Laboratory Report No. 62-63 entitled "Quality Aeaurance Test of Truck, l/U Ton, hxh, KL5I, USA. Reg. No. 2D2712," dated 6 July 1962. Weight distribution characteristics were a« followst

Wheel Position W/0 Payload-Lb W/Crosa-Country Pay load - Lb

W/Hlghway Payload-Lb«

Left front 65O 735 7^5 Right Front 650 770 790 Left Rear U95 930 U35 Right Rear 520 910 1210

Total Weight 2315 33^5 388O

* Includes two crewmen.

2. RESULTS

2.1 Bpeclflo

Tabulated below are the total vehicle weights with payload, driver and two crewmen.

Total Weight - Pounds

MI51 No. 2C6389 M151 No. 2C6391 M151 No. 2C6388 V/XM28 Weapon W/XM29 Weapon XN29 Weapon System

Condition System Payload System Payload Secondary Vehicle

W/0 Crew 2895 3

\ 1

The above weights were distributed as follows:

Per Cant of Total Weight

Position M151 No. 2C6389 MI5I No. 2C6391 MI5I So. gggjgg W/0 With W/2 W/0 With W/2 W/0 With W/2

Crew Driver Crewmen Crew Driver Crewmen Crew Driver Creienen

Front Wheels

Rear Wheels

47.5 47.4 ^.7

52.5 52.6 53.3

42.9 42.3 42.3 51.8 51.3 50.6

57.1 57.7 57.7 48.2 46.7 49.4

Loft Side

Right Side

47 49 47.1

53 51 52.9

44.3 46.6 45.5 50.3 52.8 50.7

55.7 53.4 54.5 49.7 47.2 49.3

Complete weight distribution data are presented on Inelosure 62-95-1.

- Center of gravity locations of the vehicles with their respective payloads, without crew are as follows:

Center of Gravity - Inches

Longitudinal Transverse * Above

Ground Level

»Q51 No. 2C6389 20-1/2

KL51 No. 2C6391 25-1/4

M151 No. 2C6388 20-1/2

Forward of Rear Wheels Centerline

39-3/4

36-1/4

45-1/4

To Right To Left of Vehicle of Vehicle Centerline Centerline

1-5/8

* Computed from load distribution values.

3/16

2.2 Discussion

The weight distribution data reflect that the transverse loadings on vehiolea 389 and 391 are unequal and may have an undesirable effect on vehicle stability when operated on high crown roads or cross-country. Moving the •pare tiro from the right to the left side of the vehicle would improve this

condition but the amount of weight transfered would not be sufficient to equalise the load.

DETAILS OP TEST

3.1 Poacrigtion

Tbs throe W.5I Trucks utilised for these tests ware standard vehicles modified to accept the XM2Ö or XM29 Weapon System components. The spare tire locations on vehicles Hos. 2C6389 and 2Ö6391 vere changed from the left rear to the right side for the weapon Systems Installations, and hoary duty suspen- sion components were provided.

3.2 Procedure

Weight distribution was determined by placing load cells under each Wheel. AU wslghts include the complete weapon system components intended to he carried by each vehicle but did not include the vehicle's pioneer equipment.

The longitudinal and vertical center of gravity Locations were determined by the suspension method.

SUBMITTED!

T. COOKS Engineer

REVIEWED: APPR»

}/Ji> . tflLES 'Rry. JUHHSOH

of, Field Engineering Section Chief,/ Automotive Engineering laboratory

V

c-k

-71

WKIOHT DISTRIBUTION CHARACTERISTICS OF

TRUCK, UTILITY, 1/U TON, klük, WL51, USA REG. NO. 2C6389, W/XM28 WEAPON SYSTEM]

TRUCK, UTILITY, lA TON, kXk, «51. USA REG. NO. 2C6391, W/XM29 WEAPON SYSTEM!

TRUCK, UTILITY, l/U TON, UX^ M151, USA REG. NO. 2C6388, XM29 WEAPON SYSTEM

SECONDARY VEHICLE

Test Condition

Left Weight

Lbs

Front J-Total Weight

RiKht Weight

Lbs

Wheel Position

Front Left Rear *-Total Weight H-Total Weight Lbs Weight

Right Weight

Lbs

Rear *-Totsl Weight

Total Wt - Lbs

W/O Crev

M151 No. 2C6389

665 23

710 2^.5

695 2k

825 28.5

2895

M151 No. 2C6391

615 20.2

690 22.7

735 2U.1

1005 33

30^5

M151 No. 2C6388

670 26.6

635 25.2

595 23.7

615 2U.5

2515

W/Driver

M151 No. 2C6389

725 23.8

720 23.6

770 25.2

835 27. k

3O5O

M151 No. 2C6391

665 20.6

700 21.7

8hO 26

1025 31.7

3230

M151 No. 2C6388

7^0 27.5

6*0 23.8

680 25-3

630 23. u

2690

W/2 Crewmen

M151 No. 2C6389

725 22.7

765 2k

780 2k.k

920 28.9

3190

M151 No. 2C6391

685 20.2

750 22.1

860 25.3

1100 32. k

3395

M151 No. 2C6388

735 25.9

700 2U.7

705 2k.&

695 2*. 6

2835

c"5 62-95-1

1

ENGINEERING* LABORATORIES PHYSICAL TEST LABORATORY REPORT

STEAP-DS-LP

TEST OF:

Truck, (Jeep) £ Ton, M.U.T.T., M151, w/Mount, Gun, XMI3I, 120-mm.

OBJECT OF TEST:

To determine the tmount of deformation (if any) of the right rear side of the Jeep as a result of firing.

INSTRUMENTATION:

Trammel beam and accessories.

PROCEDURE:

Report No.

Sheet 1

62-L-166

of

Dates of Test 9, 11, 15 and

17 Oct 1962 ___

Report Complete 22 Oct 1962

Conducted for Lt. Killian

Artillery Division

CMS Code 553O.i2.533OO.O3.Ol

W.O. No. 321-30^-30

References None Trammel points were established __ on the right rear side of the jeep, after road test, before firing and the same point locations measured after firing h, 8 and hi major caliber round« and 6 spotting rifle rounds.

RESULTS:

1. The maximum change that occurred was /.251", points A-C and /.250", points A-B after firing kl major caliber and 6 spotting rifle rounds.

2. See Appendix I for data and sketch of trammel point locations.

1 Incl Appendix I

SUBMITTED:

H. M. JAMISON Measurements Section

REVI

«

APPROVED:

. L. Chief Measurements Section

/ftcf tu -£~k*n // J. M. MCKINLEY v / Chief

v Physical Test Laboratory

C-6

\ 1

STEAP-DS-LP Report Ho. 62- Sheet 1 of

L-1S6 1

Trammel Distance (In.)

Points

B.F. After Road Test 9 Oct 62

A.F. 6 Spotter k MaJ. Cal. Rounds 11 Oct 62

Total Change

A.F. 6 Spotter 8 MaJ. Cal. Rounds 15 Oct 62

Total Change

A.F. 6 Spotter kl MaJ.Cal. Rounds 17 Oct 62

Total Change

A-C A-B C-B

29.012 33.177 9.556

29.II2 33.287 9.556

/.100 /.no .000

29.152 33-333 9.556

Al»« /.156 .000

29.263 33.^27 9.556

/.25I /.250 .000

Right Rear Side of Jeep w/Mount, Gun, XM131, 120-mm, US Army Ho. 2C6389

Trammel Point Locations

Crack in 'sheet metal

[approx.) O.V long from bottom edge up1

after road test, B.F crack unchanged After Firing.

Appendix I

C-7

APPENDIX D

SI8-OOI-3368-P/ORD-62: Three-Quarter Left Front View of XM28 Weapon System.

D-l

) 1

S18-001-3369-P/OBD-62: Three-Quarter Right Rear View of XM28 Weapon System.

D-2

s 1

Sl8-001-3370-p/OED-62: Right Side View of XM28 Weapon System.

D-3

71

^^KÄaLw^jÄP'*1' -**WSi!t

S18-001-33T1-P/0BD-62: TOP: Front View,

Weapon System.

BOTTOM: Rear Viev,of XM28

DA

71

SI8-OOI-3366-P/ORD-62: Top View of XM28 Weapon System.

D-5

\ 1

SI8-OOI-3365-P/OKD-62: Alternate Firing Position of XM28 Weapon

System,

D-6

1

!«

n

ae-OOl-3376-P/OBB^ Shree-^rter »ft Front Viev of «9 Weapon

System.

D-8

\

?

■

"mm

*

S18-001-3379-P/ORD-62: Three-Quarter Right Rear View of XM29 Weapon

System.

D-9

~l

S18-001-337T-P/ORD-62: Eight Side View of XM29 Weapon System.

D-10

—

S18-001-3378-P/ORD-62: TOP: Front View, BOTTOM: Rear View, of XM29 Weapon System.

D-ll

\ ~1

Sl8-001-337^-P/OKD-62: Top Viev of XM29 Weapon System.

D-12

1

S18-001-33T2-P/ORD-62: Alternate Firing Position of XM29 Weapon

System.

D-13

71

S18-001-33T3-P/ORD-62: Alternate Firing Position of XM29 Weapon

System.

D-lk

~!

_ - i

- '-

S18-001-3357-P/ORD-62: Three-Quarter Left Front View of XM29 Weapon System Secondary Vehicle.

D-15

1

■S£äP*js_

Sl8-001-3359-P/ORD-62: Three-Quarter Right Rear View of XM29 Weapon System Secondary Vehicle.

D-l6

Sl8-001-3360-P/ORD-62: Left Side View of XM29 Weapon System Secondary Vehicle.

D-17

5 n

S18-001-3358-P/ORD-62: TOP: Front View. BOTTCM: Rear Viev of XM29 Weapon System Secondary Vehicle.

D-18

~!

I • ■

rf: \

' I Ju

SI8-OOI-336I-P/OPD-62: Top View of XM29 Weapon System Secondary Vehicle.

D-19

- fil 1

Position of Vehicle Prior to Firing Pound No. 1, level Ground, 10° Elevation, l600 Mils Left Traverse.

D-20

I 1

m ■r

. - , .^r .... ..A ^

Position of Vehicle Prior to Firing Round No. 2, Level Ground, k^e

Elevation, l600 Mils Left Traverse.

D-21

1

Position of Vehicle Prior to Firing Round No. 5, Left Side Slope, 14-5° Elevation, l600 Mils Left Traverse.

D-22

1

Side View Prior to Firing Round No. 11, Ascending, k5° Elevation, 0 Mils Traverse.

D-23

s 1

Position of Vehicle Prior to Firing Round No. 11, Ascending, k3° Elevation, 0 Mils Traverse.

B-2k

1

Position of Vehicle Prior to Firing Round No. 12, Ascending, 10°

Elevation, 2665 Mils left Traverse.

D-25

1

Position of Vehicle Prior to Firing Round No. 17, Descending, 25c

Elevation, 2665 Mils left Traverse.

D-26

Position of Vehicle Prior to Firing Round No. 13, Descending, 1*5° Elevation, l600 Mils Left Traverse.

D-27

~l

Position of Vehicle Prior to Firing Round No. lk, Descending, 10° Elevation, l600 Mils Left Traverse.

D-28

Position of Vehicle Prior to Firing Round No. 15, Descending, 33° Elevation, 0 Mils Traverse.

D-29

5 1

Position of Vehicle Prior to Firing Round Wo. l£, Descending, 12°

Elevation, 2665 Mils Left Traverse.

D-30

(*■*&-'

Position of Vehicle Prior to Firing Round No. 18, Right Side Slope, 25° Elevation, l600 Mils left Traverse.

1

D-31

"1

Position of Vehicle Prior to Firing Round No. 20, Left Side Slope, hy Elevation, 0 Mils Traverse.

D-32

1

Position of Vehicle Prior to Firing Round No. 22, Left Side Slope, 10° Elevation, 2665 Mils left Traverse.

D-33

1

Position of Vehicle Prior to Firing Round No. 26, Ascending, 35° Elevation, l600 Mils left Traverse.

D-31^

1

Position of Vehicle Prior to Firing Round No. 29, Descending, 35°

Elevation, l600 Mils Left Traverse.

D-35

1

Position of Vehicle Prior to Firing Round No. 32, Level Ground, 10° Elevation, 1218 Left Traverse.

D-36

„1

"1

Position of Vehicle Prior to Firing Round No. Elevation, 796 Mils Left Traverse.

33, level Ground, 10°

D-37

1

Position of Vehicle Prior to Firing Round No. 3^, level Ground, 10°

Elevation, 1+67 Mils Left Traverse.

D-38

i

1

Position of Vehicle Prior to Firing Round No. 36, level Ground, 25°

Elevation, 1929 Mils left Traverse.

B-39

\ -~]

Position of Vehicle Prior to Firing Round No. 37, Level Ground, 25° Elevation, 2183 Mils Left Traverse.

D-lK)

w«^ "1

■'■'-."*

Position of Vehicle Prior to Firing Round No. 38, level Ground, k? Elevation, l600 Mils Left Traverse.

D-lH

1

Position of Vehicle after Firing Round No. 3, on Level Ground with Tube Elevated 178 Mils and Traversed 2665 Mils.

D-t)-2

^_Iä 1

Position of Vehicle after Firing Round No. 8, on Right Side Slope at 178 Mils Elevation and 2665 Mils Traverse.

D-^3

1

Position of Vehicle after Round No. 13, Damage to Right Front Fender Due to Blast.

D-kk

"1

Minor Hood Damage As Occurred at Various Times throughout Test.

D-l+5

n

TV*Ü

Position of Vehicle after Round No. 21, Wires under Hood Torn Loose and Minor Hood Damage Incurred.

D-l*6

"1

Crack Developing under Right Front Fender after Firing Round No. Ul.

D-Vf

5 n

Condition of Hood after Firing Round No. kl, Note Crease across Hood at Point Where Windshield Was Tied Down.

D-!+8

[ 1

Bulging of Rear Cargo Bed.Noted at Various Times throughout Firing.

D-U9

». «.. I ~1

View from Below of Bulging of Floor Boards on Assistant Driver's Side of Vehicle. Note Separation of Pieces of Sheet Metal (after Round No. kl).

D-50

1

Bulging of Fender As Noted after Round No. ^1.

D-51

1 APPENDIX E

Firing Record

DEVELOPMENT AND PROOF SERVICES ABERDEEN PROVING GROUND, MARYLAND

FIRING RECORD

Firing of XM28 Weapon System from Firing Record No.: M-ÖI837 l/k-Ton, kxk, Truck, Utility, M151 Dates of Test: 10 to 17 October I962

Authority: AOS 20 dated 3 August 1962 CMS Code No.: 5530.12.533GO.03.01 Engineering Test W. 0. No. 321-304-30 cjz

ITEMS UNDER TEST

Truck, utility, l/'i-ton, kxk, M151. Recoilless gun, 120-mm, XM63EI, No. 209. Vehicle mount, XM13L

SUPPORTING FACILITIES AND MATERIALS

Ammunition Components:

Internal clugs, 120-mm (drawing No. FB^lk86, revision 5), with neoprene obturators,

launching piston, 120-mm, XM5E1. External masses (drawing No. FC10313). Propellant, M5, MP, 0.0^0-inch web, lot HPC-132^5, loaded in phenolic

containers. Igniters, 4000-grain, Al black powder, with X275H electrical initiators.

Instrumentation:

High-speed cameras, l6-mm, used to obtain muzzle motion. Motion-picture cameras, 128-fps, used to obtain an over-all view of

vehicular stability.

ROUND-BY-ROUND DATA

Round-by-round data are contained in Inclosure 1,

REMARK

This firing record forms a part of Report No. DPS-775.

1 Incl 1. Round-by-Round Data

S I 71

SUBMITTED:

/Jyj. KILLIAN,/^T / iMZapt, Ord Cori/

FR No. M-81837

REVIEWED;

J&"p- 'T--£.,■* S

J. FARRELL Acting Chief, Mortar and Recoilless Rifle Branch

APPROVED:

a. H. A.' BECHTOL^ Chief, Artillery- Division

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1 APPENDIX F

Distribution

NAME AND ADDRESS NO. COPIES

Commander Armed Services Tech Inf Agency- Arlington Hall Station Arlington 12, Virginia

Commanding General U. S. Army Materiel Command Washington 25, D. C. ATTN: AMCOR-TN

AMCOR-TW

Commanding General Test and Evaluation Command Aberdeen Proving Ground, Md. ATTN: AMSTE-T/'

Commanding U. ',".. Army Munitions Command Dover, New Jersey

Commanding General U. S. Army Weapons Command Rock Island, Illinois

10

1 1

NAME AND ADDRESS

Commanding General U. S. Army Tank-Auto. 1501 Beard Street Detroit 9, Michigan ATTN: SMOTA-WS

Commanding Officer Watervliet Arsenal Wate rv lie t, New York

Commanding Officer Picatinny Arsenal Dover, New Jersey

Commanding Officer Frankfora Arsenal Philadelphia J(, Pa.

Commanding Officer Diamond Fuze Lab Washington 25, D. C. ATTN: AMXDO-012

NO. COPIES

Command

ATTN: AMSWE-VA 2 Commanding Officer Lt Col 0. H. Rodgers 1 Yuma Test Station

Yuma, Arizona Commanding General ATTN: STEYT-TA-AS 1 U. S. Army Tank-Auto. Command Detroit Arsenal Commanding Officer Cente r Line, Michigan Aberdeen Proving Ground, Md. ATTN: SKOTA-AL

SMOTA-REC 1 1

ATTN: STEAP-DS-D 1

SMOTA-REO 1 TechnicsL Library SMOTA-REM 1 Aberdeen Proving Ground, SMOTA-REW.1 2 Maryland Master SMOTA-R 1 1 Reference SMOTA-RRC 1 1 Record SMOTA-FMC 1 SMOTA-FMW 2 SMOTA-LT 1 SMOTA-IQK.3 2 SMOTA-IF. 5 2 SMOTA-REV 1

F-l

1

AD Accession No. D&PS, Aberdeen Proving Ground, Maryland FIRST PARTIAL REPORT ON PRODUCTION ENGINEERING TEST OF XM28 AND XM29 WEAPON SYSTEM INSTALLED ON TRUCK, UTILITY, 1/4- TON, UXU, M151 - J. Gllkey and H. Killlan

Report No. DPS-775, January 1963 OMS Code No. 5530.12. 53300. 03. 01 D. A. Project No. 512-15-018 Unclassified Report

The XM2Ö weapon system mounted on an M151 vehicle vau subjected to road tests and firing tests at Aberdeen Proving Ground and was found to be generally satisfactory. It is recommended that the adapter kit for mounting the XM28 weapon system on the M151 vehicle be considered generally satisfactory for either vehicle operation or weapon firing provided the redesigned mounting bracket is used. The XM29 weapon system secondary vehicle be considered acceptable as a support vehicle for that system. The firing safety limits prescribed be adopted to minimize vehicle damage.

AD Accession No. D&PS, Aberdeen Proving Ground, Maryland FIRST PARTIAL REPORT ON PRODUCTION ENGINEERING TEST OF XM28 AND XM29 WEAPON SYSTEM* INSTALLED ON TRUCK, UTILITY, 1/4- TON, kXk, M151 - J. Oilkey and H. Killlan

Report No. DPS-775, January 1963 OMS Code No. 5530.12. 533GO. 03. 01 D. A. Project No. 512-15-018 Unclassified Report

The XM28 weapon system mounted on an M151 vehicle was subjected to road tests and firing tests at Aberdeen Proving Ground and was found to be generally satisfactory. It is recommended that the adapter kit for mounting the XM28 weapon system on the M151 vehicle be considered generally satisfactory for either vehicle operation or weapon firing provided the redesigned mounting bracket is used. The XM29 weapon system secondary vehicle be considered acceptable as a support vehicle for that system. The firing safety limits prescribed be adopted to minimize vehicle damage.

. 1

AD Accession No. D&PS, Aberdeen Proving Ground, Maryland FIRST PARTIAL REPORT ON PRODUCTION ENGINEERING TEST OF XM28 AND XM29 WEAPON SYSTEM ^INSTALLED ON TRUCK, UTILITY, 1/4- TON, 4X4, M151 - J. Gilkey and H. Klllian

Report No. DPS-775, January 1963 CMS Code No. 5530.12. 533GO. 03. 01 D. A. Project No. 512-15-018 Unclassified Report

The XM28 weapon system mounted on aa ;LL5X vehicle vas subjected to road tests and firing tests at Aberdeen Proving Ground and was found to be generally satisfactory. It is recommended that the adapter kit for mounting the XM28 weapon system on the M151 vehicle be considered generally satisfactory for either vehicle operation or weapon firing provided the redesigned mounting bracket is used. The XM29 weapon system secondary vehicle be considered acceptable as a support vehicle for that system. The firing safety limits prescribed be adopted to minimize vehicle damage.

Accession No. AD D&PS, Aberdeen Proving Ground, Maryland FIRST PARTIAL REPORT ON PRODUCTION ENGINEERING TEST OF XM28 AND XM29 WEAPON SYSTEM5 INSTALLED ON TRUCK, UTILITY, l/4- TON, 4X4, MI5I - J. Gilkey and H. Klllian

Report No. DPS-775, January 1963 OMS Code No. 5530.12. 533GO. 03. 01 D. A. Project No. 512-15-018 Unclassified Report

The XM28 weapon system mounted on an M151 vehicle was subjected to road teats and firing tests at Aberdeen Proving Ground and was found to be generally satisfactory. It is recommended that the adapter kit for mounting the XM28 weapon system on the M151 vehicle be considered generally satisfactory for either vehicle operation or weapon firing provided the redesigned mounting bracket is used. The XM29 weapon system secondary vehicle be considered acceptable as a support vehicle for that sybtem. The firing safety limits prescribed be adopted to minimize vehicle damage.