Team D.A.N.K. TREDS Design November 29, Pacific Ave. Stockton, CA Travis Damaso Scott Akers Zachary Kimura Nick 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 LauncherProsCons Ballista  Lateral accuracy  Long distances  Compact design  Complexity  Difficult materials  Spring deformation  Transportation Catapult  Simple design  Simple launch platform  Prior knowledge of construction  Hard to modify power  Unoriginal Trebuchet  Easy to modify power  Portability  Easy reconstruction  Originality  Size limit affects power

Procedure (cont’d) EPUProsCons Straws Cheap Bendable Breaks easily Not trebuchet material Floam Moldable Compact Expensive Marshmallows Squishy Delicious Cheap 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 DateResult October 25, 2005 Launched 5 apples Traveled: 5 ft, 7 ft, 3 ft, 10 ft, and 3 ft November 8, 2005 Weight doubled Kiwis flown to maximum 23 feet November 12, 2005 Longer moment arm Sling added Kiwis travel 10 feet EPU travels 15 feet November 14, 2005 Weight increased to 25 lb Sling shortened EPU flown 31 feet November 15, 2005 EPU traveled 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’sTeam D.A.N.K. Accuracy0.1 ft from center12.3 ft from center

Acknowledgements buchet_2.jpg buchet_2.jpg buchet_1.jpg buchet_1.jpg ject_results.htm ject_results.htm