Team D.A.N.K.TREDS DesignNovember 29, 20053601 Pacific Ave.Stockton, CA 95211

Travis DamasoScott AkersZachary KimuraNick Nelson

Presentation Outline

1. Introduction

2. Background

3. Procedure

4. Analysis

5. Testing

6. Results

7. Discussion

8. Conclusion

Introduction

Problem Developing country lacks fresh eggs

Solution Design and build a Trans-River Egg Delivery

System (TREDS)

Background

Project Constraints 30 foot wide river 10 foot diameter target

zone 72 inch maximum

dimensional sum $20.00 budget Time No prefabricated

materials

Project Criteria Tools available Cheap materials Safe Simple Environmentally safe Not noisy

Procedure Preliminary Ideas

Launcher Pros Cons

Ballista Lateral accuracyLong distancesCompact design

ComplexityDifficult materialsSpring deformationTransportation

Catapult Simple designSimple launch platformPrior knowledge of construction

Hard to modify powerUnoriginal

Trebuchet Easy to modify powerPortabilityEasy reconstructionOriginality

Size limit affects power

Procedure (cont’d)

EPU Pros Cons

Straws CheapBendable

Breaks easilyNot trebuchet material

Floam MoldableCompact

Expensive

Marshmallows SquishyDeliciousCheap

Could get stale

Sketches

Front View of Trebuchet

Side View of Trebuchet

Analysis

Win Trebstar 4.05 Computer program used

to derive dimensions Guess & Check

Complex trebuchet calculations

Win Trebstar 4.05 Program

Testing

Date Result

October 25, 2005 Launched 5 applesTraveled: 5 ft, 7 ft, 3 ft, 10 ft, and 3 ft

November 8, 2005 Weight doubledKiwis flown to maximum 23 feet

November 12, 2005 Longer moment armSling addedKiwis travel 10 feetEPU travels 15 feet

November 14, 2005 Weight increased to 25 lbSling shortenedEPU flown 31 feet

November 15, 2005 EPU traveled 28-32 feet

Competition Results

Disqualification Over the 72 inch size limit

Performance of EPU Both eggs intact

Performance of Trebuchet Wire trigger lowers distance PVC construction failure

Discussion

1. Trebuchet Weak base Wire trigger Construction failure

2. EPU Metal Can Marshmallows

Conclusion

Suggested Improvements Improved trigger system Improved stability Stronger moment arm Stay within size limit

Huevos Deliverer’s Team D.A.N.K.

Accuracy 0.1 ft from center 12.3 ft from center

Acknowledgements

http://www.redstoneprojects.com/trebuchetstore/pvc_trebuchet_2.jpg

http://www.redstoneprojects.com/trebuchetstore/pvc_trebuchet_1.jpg

http://www1.pacific.edu/eng/courses/engr/engr5/F05_Project_results.htm

http://www.algobeautytreb.com/ http://www.a2armory.com http://www.urich.edu