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The Pacific Launchers 1
Parabolic Food Aid Delivery System (PFADS)
The Pacific Launchers
Ryan Liu & Michael NguyenUniversity of the Pacific ENGR 5
December 2002
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Overview• Introduction
• Constraints & Criteria
• Method/Approach (Design Process)
• Testing
• Results/Findings
• Conclusions
• Recommendations
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Introduction
Designated to design and build a mobile
parabolic food aid delivery system
(PFADS) that would launch a Food Aid
Package down an inclined ramp.
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Our Objective:
• To construct model of PFAD using the Design Process.
• Learn presentation skills.
• Group Dynamics & teamwork skills.
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The Launch Area
Fig 1. Launch Ramp and Target Area (Elevation View)
Fig 2. Launch Ramp and Target Area (Plain View)
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Constraints Criteria• Dimensions: 18 x 18 x 18 in.
• Weight Max: 10 lbs.
• Cost under $20.
• Traverse down the ramp on its own.
• Remain behind barrier upon impact.
• Light Weight/Small.
• Efficient/Effective.
• Low Cost.
• Accurate
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The Design Process
•Pros
•Accurate
•Easy Construction
•Cons
•Too Heavy
•Meet Constraints?
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The Design Process (Cont.)
• Pros Small, light weight Cheap Simple Design
• Cons Not accurate Don’t have enough force to launch FAP Trigger device, not sufficient
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The Design Process (Cont.)
• Pros Accurate Trigger device is
sufficient Light weight
• Cons Might be too big Supplies may be hard to find Not enough energy to launch FAP
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The Design Process (Cont.)
Reasons for choosing design:
1. Very Effective trigger device.
2. Efficient launching platform.
3. Stable and sturdy.
4. Launching device is powerful.
5. Light weight.
6. Material availability.
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Final Design
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Construction of Final Design• Constructed of:
– Metal Strip (Antenna)– Springs– Cup Hooks/Screws– Wood (Dowel, Straight)
Steps of Construction:1. Construction of body.2. Launch mechanism arm.3. Addition of wheels & launcher.4. Placement of trigger (dowel).5. Construction of holder.
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Testing• Test 1 Error: PFADS model
didn’t stay on ramp.
• Test 2 Error: FADS didn’t stay on launching mechanism.
• Test 3 Error: FADS didn’t have enough energy to put over wall.
• Test 4 Error: Trigger device wasn’t sufficient enough.
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Final Mechanism
After Implementation
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Results/Discussion
• Ranked 22nd out of 36 groups.
• Final FOM score of 45.60
• FAPS did not make it over wall.
• Launched the 2nd time only.
Performance in Competition:
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Results/Discussion (Cont.)• Advantages:
– Durable.
– Light.
– Small.
• Disadvantages:– Release mechanism not strong.
– Wheels made FAP fall off holder.
– Not very strong launcher.
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Conclusion• PFADS constructed by ENGR 5 Pacific Launchers.
• Purpose to launch FAPS over a wall into a target.
• Incorporated Group Dynamics and the Design Process.
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Conclusion (Cont.)• Met most design constraints.
– Fit max dimensions (16” x 7.75” x 10”).
– Did not tip over barrier upon impact.
– Under max weight of 10 pounds (3 pounds).
• Proved to be small and light. But not powerful.
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Recommendations• Set catapult arm to have proper launch angle.
• Take out rear wheel.
• Steady launch holder.
• Stronger launching mechanism.– Springs with greater tension.
• Correction of unsteady/uneven wheels.– Rolls straight down ramp.
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Acknowledgements• Professor Kurt C. Schulz
• Group Members: Santos Ortega & Kasandra Appleby