PARABOLIC FOOD AID PARABOLIC FOOD AID DELIVERY SYSTEMDELIVERY SYSTEM

TIM JONESTIM JONES

NHAN NGUYENNHAN NGUYEN

BLOODY MARYBLOODY MARY

School of Engineering and Computer ScienceSchool of Engineering and Computer Science

University of the PacificUniversity of the Pacific

Fall 2002Fall 2002

ENGR 5: Lab Section 3

OVERVIEW

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•Introduction

•Constraints & Criteria

•Project Objectives

•Approach: Design Process

•Discussion of Results

•Suggested Improvements

•Conclusions

•Acknowledgements

INTRODUCTION

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•Purpose: design a mechanism to launch a Food Aid Package over a wall to a designated point

CONSTRAINTS

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•Volume18x18x18 inches

• weight10 lbs.

•Cost$20

•No motors or propellants

•1 minute to set up

•start behind the line

CRITERIA

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•Minimize size

•Minimize weight

•Maximize accuracy

PROJECT OBJECTIVES

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Start line

4 in

3.5 ft10 ft 10 ft

FAP TARGET SPOT

6 ft 2 in

PYTHON-INFESTED JUNGLE

BOUNDARY

PRELIMINARY IDEAS

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Preliminary Idea #1: Catapult Preliminary Idea #2: Cannon

PRELIMINARY IDEAS (CONTINUED)

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Preliminary Idea #3: Slingshot Preliminary Idea #4: Mouse trap

REFINEMENT

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•PROS

enough force

accurate

•CONS

dimensions

fall into infested river

rubber band

wheels

FAP

PFADS

Preliminary Ideas #1: Catapult

REFINEMENT (CONTINUED)

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•PROS

enough force

easy to construct

•CONS

durability of elastic band

height may exceed

inaccurate

wheels

rubber band

FAP

PFAD

Preliminary Ideas #3: Slingshot

DECISION

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wheels

screwstrigger

rubber band

FAP

Preliminary Idea #3: Slingshot

CONSTRUCTION

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copper barssprings

wheels

screws

copper bars

Gathered the materials Cut the bars to length

CONSTRUCTION (CONTINUED)

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wheels

screws copper bar

Soldered the frame together

Screwed on the wheels

CONSTRUCTION (CONTINUED)

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Attached the springs

spring____

copper bar___

wood

copper wire

_____

______

Developed a triggering device

TESTING

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FINAL MECHANISM

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screw

arm band

ice trays

hook

arm bar

screws

hinge

wheels

trigger

Side View: Catapult

springs___________

FINAL MECHANISM (CONTINUED)

BLOODY MARYFront View: Catapult

Length=26.5 in

Width=15.5 in

Height=9.75 in

Weight=4 lbs

FAP

springs

wheels

ice trays

arm bar

RESULTS

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•1st Trial: Did not launchHook would not attach to PVC pipe

•2nd Trial: Did not launchHook would not attach to PVC pipe

•3rd Trial: Did not launchContainer ripped

RESULTS (Continued)

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Advantages:

•Weight

•Went down the ramp

Disadvantages:

•Exceed dimension limit

•Did not launch the package in any of the three trials

SUGGESTED IMPROVEMNTS

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•Stronger structures

•Smaller dimensions

•More durable container

•Time Management

CONCLUSION

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•Performance: poorly due to error in design

•constraints: 18x18x18 volume

•criteria: size, weight, and accuracy.

•final design: catapult.

•suggested improvements: stronger structures and smaller dimensions.

ACKNOWLEDGEMENTS

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•Professor Camilla Saviz & Kurt Schulz

•Employees at Home Depot