Parabolic Hacky Sack Launch Mechanism Kristin Hans Khalid Al Mehairi Mark Quijano Jonathan Koehler The Bamboo Launchers School of Engineering University of the Pacific Presentation done by: Mark Quijano & Khalid Al Mehairi

2 The Bamboo Launchers School of Engineering University of the Pacific Outline  Introduction  Constraints/Criteria  Preliminary Ideas  Refinement  Implementation  Decision/Final Design  Results  Suggested Improvements  Conclusions  Acknowledgements

3 The Bamboo Launchers School of Engineering University of the Pacific Introduction  Engineering 5 Project  Design Mechanism  Mechanism must travel down a ramp  Launch Hacky Sack after reaching end of ramp  Create Teamwork skills

4 The Bamboo Launchers School of Engineering University of the Pacific Constraints/Criteria  Constraints  18in x 18in x 18in max  10 lbs. Max  60 sec Prep time  1 ft setup on ramp  20 ft distance min/max  $20 max  Criteria  Optimize weight  Optimize size  Launch as close as possible

5 The Bamboo Launchers School of Engineering University of the Pacific Figure 1 Trigger Wooden Spoon Wheels Trigger weight Figure 2 Trigger elastic Figure 3 Trigger spring Figure 4 Preliminary Ideas

6 The Bamboo Launchers School of Engineering University of the Pacific Refinement Pros  Figure 1  Lighter  Figure 2  Easy to calculate distance  Figure 3  More Accurate  Figure 4  More power  Lighter Cons  Figure 1  Unreliable trigger  Figure 2  Heavy  Figure 3  Unreliable trigger  Figure 4  Hard to calculate force

7 The Bamboo Launchers School of Engineering University of the Pacific Refinement Cont. Figure 4

8 The Bamboo Launchers School of Engineering University of the Pacific Implementation  Simulated 3ft ramp with 30º angle  Numerous trail launches  Adjustment on elastic force

9 The Bamboo Launchers School of Engineering University of the Pacific Decision/Final Design  Energy stored in elastic bands and springs  Made from:  Wood, springs, cup, wire, wheels, bamboo, screws, duct tape, glue  1496in 3  Lightweight – 2lbs  Consistent in testing

10 The Bamboo Launchers School of Engineering University of the Pacific Results Distance (D T ) Volume (V pre ) Weight (W act ) FOM Trial 1 Trial 2.25 ft 1496 in 3 2 lbs 3.17 ft 1496 in 3 2 lbs AverageFOM

11 The Bamboo Launchers School of Engineering University of the Pacific Suggested Improvements  Stronger Pivot joint  Better aim  More constant distance  Lighter wood  Optimize weight  Drill pilot holes  Prevent cracking  Move back wheels forward  Fit on start area

12 The Bamboo Launchers School of Engineering University of the Pacific Conclusions  2 nd Place with average FOM of .25ft from target  Final Design  Wooden Design w/ 4 wheels  Spring and Elastic Powered  Catapult Method  1496in 3 and 2 lbs

13 The Bamboo Launchers School of Engineering University of the Pacific Acknowledgements  Calaveras River  Orchard Supply store  Mr. Koehler

14 The Bamboo Launchers School of Engineering University of the Pacific