University of the Pacific1 PFADS Project Team P.O.C. Gavin Saito Miguel Perez Michael Bruch December 5, 2002 University of the Pacific Introduction to.

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PFADS ProjectTeam P.O.C.

Gavin Saito

Miguel Perez

Michael Bruch

December 5, 2002

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Introduction to Engineering

Lab Section 6

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Outline P.O.C. Introduction Constraints/Criteria Objectives Design Process Conclusion

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Introduction

FAPs (4-3/8 in x 5-1/2 in cube 200 g) PFADS 6 Feet 2 Inch Wall Target 10 Feet Away Hill 4 inch Wall

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Constraints 18 x 18 x 18 inches Less Than 10 Pounds May Not be Propelled No Motors or Propellants No Pre-Constructed Devices

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Constraints

Launch at Bottom of Hill 1 Foot Starting Area All Parts of PFADS Behind 4 in Wall

PYTHON-INFESTED JUNGLE

BOUNDARY

START LINE 4 in

10 ft10 ft3.5 ft

6 ft 2 in

FAP Target

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Criteria Size Weight Distance From Target Reliability

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Objectives Use Design Process Design a Viable PFADS Group Efficiency

Flexibility Responsibility

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Preliminary Ideas Spring loaded

platform inside housing

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Preliminary Ideas Spring board

with hinges

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Preliminary Ideas Trebuchet

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Preliminary Ideas Catapult

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Refinement

Pros ConsSpring loadedplatform insidehousing

Direction Control Precision

Platform inhousing mayjam

Package mayjam

Spring boardwith hinges

Direction Power Control Angle

adjustment Trigger

Mechanism

Stability

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Decision & Implementation

Team decided on which idea to pursue Idea 2-Spring board Insert final sketch

Team then implemented construction of design

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Construction Construction began with original idea in

mind Wood cut and mounted launch arm attached, w/screws and hinges Springs attached, w/nails wheels attached, w/nails

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Construction

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Construction

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Construction

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Testing Preliminary testing occurred during initial

construction and afterwards PFAD testing included:

Launching on flat surface, releasing by hand Launching on flat surface, releasing with

launch mechanism Rolling down the ramp Launching at bottom of ramp

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Testing Results After preliminary testing, several problems

arose Not enough force Angle not correct Springs not compressing properly Did not fit in dimension constraints Launch mechanism did not work Too heavy

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Modification Modifications made due to testing

Was raised to new angle Dimensions were minimized New launch mechanism More springs Springs held more secure in place Mounted new FAP holder

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Final Mechanism Dimensions of final design

Weight-9 lbs. Dimensions-21’ x 9’ x 14.5’ Volume-2704.50 in³

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Final Mechanism Key Features

Angled launching mechanism reliable and secure Smaller dimensions Less weight Travels in straight line More force due to extra springs

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Final Mechanism

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Results:Competition Results

Placed 35th

Disqualified for Dimensions Structural Failure

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Discussion:Advantages/Disadvantages Spring Energy Trigger Elevated Angle of

Depression Key: Teamwork

Structural Integrity Balance

FAP Frame

Velocity

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Improvements Stronger base for springs Better balancing Test pressure of springs Utilize on-school facilities (i.e. wood shop)

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Conclusions Dimensions PFAD Mission Attributes of Final Design Competition Results Future Plans

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Acknowledgements Professor Kurt Schulz Professor Camila Saviz History Channel Darcie Bruch