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

2. Overview • Problem • Approach • Results • Improvements • Conclusions • Acknowledgements

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

5. Approach • Preliminary Ideas • Refinement • Analysis • Implementation • Testing

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

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

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

9. Analysis • Conservation of Energy • Elastic Energy

10. Analysis • Projectile motion

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

12. Testing • Trial Setup

13. Results • Final design • Competition performance • Analysis

14. Successful Trial Data

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

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