Team JADS 1

The PFADS Competition

Team JADS

Sean McNary

John Yoshimura

ENGR 5 - Lab 5

Team JADS 2

Outline

Problem Definition Design Process Design Process continued Results and Discussion Suggested Improvements Conclusions Acknowledgements

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Introduction/Background

Problem: Design PFADS for UNICEF Parabolic Food Aid Delivery System

PFADS must deliver Food Aid Package to target location

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Introduction/Background

PYTHON-INFESTED JUNGLE BOUNDARY

4 in

4 ft 8 ft

STARTLINE

FAP TARGET SPOT

6 ft 2 in

3.5 ft

10 ft 10 ft

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Constraints

PFADS: Weight < 10 lbs. Length < 18 in. Width < 18 in. Height < 18 in. Cost < $20.00 Built using no pre-constructed materials

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Criteria

Hit target 10 feet away and maximize accuracy

Go over 6’ 2’’ high wall Device launches when trigger hits barrier Complete device must remain behind

barrier Minimize Weight (< 10 lbs.) Minimize Volume (< 18’’x18’’x18’’)

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Project Objectives

Design and construct a PFADS using the design process.

Practice Teamwork

Create and Give a Formal Presentation

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Preliminary IdeasPreliminary Ideas

Catapult Modified Catapult

Rat Trap Sling-Shot

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Refinement

Pros Simple Release

Mechanism Weight of Launcher

Cons Accuracy of launch Low release angle FAP launch distance Total Volume of Device

Catapult

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Refinement

Pros Large, Stable Base Smaller Launch Arm Simple Trigger Weight of Launcher

Cons FAP Launch Distance Launch Accuracy Launcher Volume

Modified Catapult

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Refinement

Pros Launcher Volume Launcher Weight

Cons FAP Launch Distance Launch Accuracy Incorporating Rat Trap

in Launcher Low Launch Angle

Rat Trap

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Refinement

Pros FAP Launch Distance Launch Accuracy

Cons Launcher Volume Launcher Weight

Sling-shot

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Decision/Implementation Designs 1-3 have similar launch mechanisms

Steep launch angle reduces power of catapult Sling shot needed improvement to guide

FAP through sling shot (Frame with Rails). Sling Shot

selected to be

constructed.

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Construction and Testing

First Design: Weight: 9 lbs. Height: 17.5 inches

Testing: FAP launched over wall PFADS flipped over wall

Problems: High center of gravity Rolled down ramp fast

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Construction and Testing

Solutions To prevent PFADS flipping over wall:

Reduced Volume and Weight of PFADS to lower center of gravity

Added brace with foam paddingRemoved wheels & added skis to reduce

speed

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Final Mechanism (Side View)

Total Weight: 7 lbs. Key Features:

PVC frame with rails to guide FAP

Metal rod unhooks gate latch to release FAP

Skis to slide down ramp Foam Bumper Adjustable Launch

Angle

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Results/DiscussionFAP launched straight and landed on

target, but rolled away.Trial Distances: 4’ and 3.25’

First FOM- 92.26 Second FOM- 101.63

Final Figure of Merit: 96.94Finished 4th

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Results/Discussion

AdvantagesLaunched FAP over wall consistentlyPFADS remained behind ramp barrier

DisadvantagesWeight and VolumeFAP hit target but rolled away

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Suggested Improvements

Use Lighter Materials Construct frame using lighter material such as

aluminum

Improve Launch Angle Mechanism Don’t use nails

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Conclusions

Key Criteria and Constraints Launch FAP over 6’2” wall to target with

accuracy PFADS Mechanism

Weight < 10 lbs. Volume < 18” x 18” x 18” Use No Pre-constructed Materials

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Conclusions

Final Design Used Sling-shot

mechanism to launch FAP Lighter and smaller than

original design Trigger: Metal rod pushed

gate hook off an eye bolt PFADS remained behind

barrier Launched FAP over wall

consistently

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Conclusions

Mechanism Performance Successfully Launched During Both Trials

4’ and 3.25’ Finished in 4th Place

Total FOM- 96.94 FAP was expected to hit and stop on target FAP actually hit target but rolled away

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Conclusions

ImprovementsReduce weight and size of PFADS Improve Launch Angle Mechanism Improve accuracy by preventing FAP

from rolling away from target

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Acknowledgements

Team JADS would like to thank the following individuals for their time and help:

Professor Saviz Professor Schultz Bob Pollard Adrian the Machinist ENGR 5 Introduction to Engineering

Course Manual