SDZ Construction: Field Artillery (Indirect Fire) Inter-service Resident Range Safety Course (Intermediate)
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SDZ Construction: Field Artillery (Indirect Fire)Inter-service Resident Range Safety Course (Intermediate)
August 2003
What is Artillery?The generic term “artillery” is given to mounted, large-caliber weapons, such as cannons or rocket launchers, used in land warfare and manned by a crew.
August 2003
RocketsHighly mobile, rapid-fire, surface-to-surface, free-flight rocket and guided missile.Complements cannon artillery to attack deep targets and to strike at counter fire, air defense and high payoff targets.
12 Rockets in less than 60 seconds at up to six aim points.2 Missiles in less than 20 seconds at one or two aim points.
August 2003
HE FamilyHigh explosive (HE)White phosphorous (WP)Hexachloroethane (HC) smokeIlluminationAnti-personnel improved conventional munitions (APICM)
Cannon Artillery Ammunition
August 2003
Dual-purpose improved conventional munitions (DPICM) Family
Area denial artillery munition (ADAM)Remote anti-armor munition (RAAMS)
Cannon Artillery Ammunition
August 2003
Base bleed (BB) DPICM familyCopperhead familyRocket-assisted projectile (RAP) familySense and destroy armor (SADARM)
Cannon Artillery Ammunition
August 2003
August 2003
Rocket Artillery Ammunition
August 2003
Degrees or Mils?“Mil” is short for milliradian (one-thousandth of a radian)
A radian is a unit of measure for angles.
Mils are more accurate than degrees
In a complete circle, 360°, there are 2 radians (6.283 radians).
1000 milliradians = one radian
There are 6283 milliradians in a circle.
We’ve made things “simpler” by standardizing 6400 mils in a circle.
August 2003
Standard Conversion Formula:
1 degree = 17.777… mils
To convert degrees to mils:Multiply degrees times 17.7845° x 17.78 = 800.1 or 800 mils
To convert mils to degrees:Divide mils by 17.783200 ÷ 17.78 = 179.9 or 180°
Converting Degrees and Mils
August 2003
Degrees Scale
Mils Scale
Index
“True-ing” the Protractor
August 2003
Constructing an Indirect-FireField Artillery SDZ
Construct the SDZ for the 155mm Howitzer, PROJ, HE, M107, FUZE, PD, M557.
Dimensions of the SDZ for this weapon system are given in DA-PAM 385-63, Chapter 11, Table 11-1, and Figure 11-1.
August 2003
Weapon:
Ammo Type:
Left Limit of Fire:
Right Limit of Fire:
Maximum Range:
Mid Range:
Minimum Range:
PE (Deflection):
PE (Range):
Legend for Field ArtilleryArea A:
Area B:
Area C:
Area E:
Map Scale:
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003
8PE
8PE
Distance X
Area E
Area A
Area B
Impact Area
Area C
Area D
Firing Point
Target Area
12PE
August 2003
Plot the targets.
Plot the firing point.
August 2003
From the worksheet, locate and draw the right lateral limit.
From the worksheet, locate and draw the left lateral limit.
Right lateral limit =
Left lateral limit =
5740 mils
5480 mils
August 2003
Find the maximum range.
Find the minimum range.
Maximum range =
Minimum range =
6750m
5550m
This completes the Target Area.
Target Area
From the firing point, scribe an arc at maximum range.
From the firing point, scribe an arc at minimum range.
August 2003
Minimum Range + 5550m
Compute Mid-RangeTo determine mid-range, add together the maximum range and the minimum range and divide the total by 2:
Maximum Range 6750m
12,300 ÷ 2 =
12,300m
Mid-Range = 6150m
6150m
August 2003
Probable Error Deflection (PED) 8Probable Error Constraints
Probable Error Range (PER) Downrange 8Uprange 12
August 2003
Probable Error ConstraintsFrom Table G (Charge 4G), Column 1, find the mid range and locate the probable errors for this range.
PED =PER = 25 5
1 2 3 4 5 6 7 8 9 10 11 12 13RANGE
ELEV
Probable Errors
Angleof
Fall
COTAngle
ofFall
TML
VEL MOR D
Fuze M564
HB TB RB
M MIL M M M SEC M MIL M/S M MIL MIL5500600065007000
344.9389.0438.3495.5
20232528
4556
12141720
0.110.120.130.14
30323335
389441500565
2.52.21.91.6
262259257255
517647804
1002
0.1420.1990.2870.445
-0.12-0.171-0.238-0.347
August 2003
From the firing point, draw lines through tic marks out past the target area.
Calculate the PED 8 x 5 = 40 (ˆ50m)
At the mid range, measure out 50m and draw tic marks.
Target Area
August 2003
From the firing point, scribe an arc through the tic mark.
Calculate the up-range PER 12 x 25 = 300m
At the uprange limit of the Target Area, measure back 300m toward the firing point.
Target Area
Draw a tic mark.
August 2003
From the firing point, scribe an arc through the tic mark.
Calculate the downrange PER 8 x 25 = 200m
At the downrange limit of the Target Area, measure out 200m away from the firing point.
Target Area
Draw a tic mark.
This completes the Impact Area.
Impact Area
August 2003
Draw straight lines through the tic marks.
From Table 11-1, find Area A.Area A =
From the lateral limits of the Impact Area, measure out 750m.
Target Area
Draw tic marks.
725m (ˆ750m)
Impact Area
August 2003
From the firing point, scribe an arc through the tic mark.
From Table 11-1, find Area B.Area B =
From the down-range limit of the Impact Area, measure out 750m.
Target Area
Draw a tic mark.
725m (ˆ750m)
Impact Area
August 2003
Draw straight lines through the tic marks.
At the firing point, measure 25° to the left and right from the limits of the impact area.
Target Area
Draw tic marks.
25°
25°
Impact Area
August 2003
Area CArea C is the secondary danger area (buffer zone) on the up-range side of the impact area and parallel to Area B which contains fragments, debris, and components from exploding projectiles functioning on the near edge of the impact area.
August 2003
Draw a tic mark at the Area C measurement.
Extend the up-range limit of the Impact Area.
Target Area
From Table 11-1, find the measurement of Area C.
Impact Area
Area C = 350m
From the firing point, scribe an arc through the tic mark.
August 2003
This completes Area C.
Connect the up-range and down-range lateral limits of Area C as shown.
Target Area
Impact Area
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Area A
Area B
This completes Area C.
Connect the up-range and down-range lateral limits of Area C as shown.
Target Area
Impact Area
Annotate Areas A, B, and C on the legend.
Area C
Erase any unnecessary lines.
August 2003
Area A
Area B
This completes Area C.
Connect the up-range and down-range lateral limits of Area C as shown.
Target Area
Impact Area
Annotate Areas A, B, and C on the legend.
Area C
Erase any unnecessary lines.
August 2003
Area EArea E is the danger area between an indirect fire weapon system and Area D. this area is endangered by muzzle debris, overpressure, blast, and hazardous impulse noise.
August 2003
Area A
Area BTarget Area
Impact Area
Area C
From the firing point, scribe an arc through the tic mark for Area E.
From Table 11-1, find Area E.Area E =
From the firing point, measure down-range 750m.
Draw a tic mark.
725m (ˆ750m)
This completes Area E.
August 2003
Area A
Area BTarget Area
Impact Area
Area C
Annotate Area E on the legend.
Area E
August 2003
Area DArea D is the safe area between Areas C and E for indirect, overhead fire of unprotected personnel.
August 2003
Area A
Area BTarget Area
Impact Area
Area C
Annotate Area D on the legend.
Area E
Area D
August 2003
Weapon: 155mm Howitzer
Ammo Type: M557 HE PD
Left Limit of Fire: 5480 mils
Right Limit of Fire: 5740 mils
Maximum Range: 6750m
Mid Range: 6150m
Minimum Range: 5550m
PE (Deflection): 50m
PE (Range): 300m / 200m
Legend for ArtilleryArea A: 750m
Area B: 750m
Area C: 350m
Area E: 750m
Map Scale: 1:50,000
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
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