1. 1 TREDS The Hard Boilers: Chris Chapman Megan Kalend See Vang ENGR 5 University of the Pacific

2. 2 Overview Problem Approach Results Improvements Conclusions Acknowledgements

3. 3 Problem Refugees inhabiting a region across a thirty-foot wide river are in need of eggs. These must be delivered across the rebel-patrolled waters.

4. 4 Constraints Size requirements Timed delivery Range Target restrictions Egg delivered intact Cost efficiency

5. 5 Approach Preliminary Ideas Refinement Analysis Implementation Testing

6. 6 Preliminary Ideas Catapult or Trebuchet? –Pros –Cons EPU –Materials –Shape

7. 7 Catapult Refinement Implemented elastic power source in place of counterweight –Pros –Cons

8. 8 EPU Refinement Material: –Armaflex® rubber insulation Shape: –Modified barbell

9. 9 Analysis Conservation of Energy Elastic Energy

10. 10 Analysis Projectile motion

11. 11 Implementation Using Laws of Conservation Logical Estimation Preliminary Platform

12. 12 Testing Trial Setup

13. 13 Results Final design Competition performance Analysis

14. 14 Successful Trial Data Trial Number Radial Distance from Center (ft., in.) 10 ft. 1 in. 25 ft. 9 in. 33 ft. 1 in. 44 ft. 0 in. 5 6 74 ft. 4 in. 82 ft. 11 in. 95 ft. 1 in. 100 ft. 9 in. 115 ft. 4 in. 123 ft. 7 in. 130 ft. 6 in.

15. 15 Future Improvements Time Constraints –Allow for scheduling problems and last-minute system checks Optimization –Optimize system in each step of design and construction process Efficiency –Solve glitches to create a more effective TREDS.

16. 16 Conclusions Constraints and Criteria Final Design Competition Performance Improvements Any Questions???

17. 17 Acknowledgements Mr. Jared Lash of Saint Mary’s High School Michael Kalend