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Idaho APPS Advanced Pumpkin Propulsion System

Idaho APPS Advanced Pumpkin Propulsion System. Team Members Andrew Schmohr Kara Peer Shelby Smith Josh Bouma Ramzi Sadeddinsarama. Advisor: Dr. Tom Hess Sponsor: Dr. John Foltz. Idaho APPS Advanced Pumpkin Propulsion System. Objective.

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Idaho APPS Advanced Pumpkin Propulsion System

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  1. Idaho APPSAdvanced Pumpkin Propulsion System Team Members Andrew Schmohr Kara Peer Shelby Smith Josh Bouma RamziSadeddinsarama Advisor: Dr. Tom Hess Sponsor: Dr. John Foltz

  2. Idaho APPS Advanced Pumpkin Propulsion System Objective Design and build a pumpkin cannon for the Clearwater Corn Maze in Lewiston, ID

  3. Idaho APPS Advanced Pumpkin Propulsion System Needs-Quantitative Cost less than $4000 Wheels 4” to 8” in diameter Launch pumpkin 200 yards Withstand 40,000 uses total 6’ by 15’ footprint (or less) 10” Barrel

  4. Idaho APPS Advanced Pumpkin Propulsion System Needs-Qualitative Aesthetically pleasing Weather protection Aiming mechanism Trigger lock for overnight protection

  5. Idaho APPS Advanced Pumpkin Propulsion System Wants-Quantitative • 1 Minute recovery time • -Qualitative • Hatch on barrel for loading • No age limit for use • No hearing protection

  6. Idaho APPS Advanced Pumpkin Propulsion System Zero Order Math Model

  7. Idaho APPS Advanced Pumpkin Propulsion System Position as a Function of Time

  8. Idaho APPS Advanced Pumpkin Propulsion System Design Options • 3 Designs • Compressed Air • Dual Spring & Winch • Extension Spring & Pulleys

  9. Idaho APPS Advanced Pumpkin Propulsion System Compressed Air Layout Tank 1 Compressor Ball Valves Tank 2

  10. Idaho APPS Advanced Pumpkin Propulsion System The Barrel • Compressed Air Propulsion • Pumpkin Support • Sabot selection • Barrel Lubrication vs. Rollers or Bearings

  11. Spring Propulsion Idaho APPS Advanced Pumpkin Propulsion System Dual Springs & Winch • Compression springs • Winch provides mechanical advantage • Winch has disconnect • Reconnection of cable

  12. Spring Propulsion Idaho APPS Advanced Pumpkin Propulsion System Dual Springs & Winch • Crank gear ratio of 15.8:1 • Disconnect in cable provides measure of safety • Potential for mechanical failures

  13. Spring Propulsion Idaho APPS Advanced Pumpkin Propulsion System Extension Springs & Pulley Springs connected to cables Sabot cranked back pulling the springs in tension Release of sabot – springs contract

  14. Spring Propulsion Idaho APPS Advanced Pumpkin Propulsion System Extension Springs & Pulley Smaller springs Sabot could tangle Inner barrel may be required to prevent tangling Increased barrel diameter

  15. Idaho APPS Advanced Pumpkin Propulsion System Base

  16. Idaho APPS Advanced Pumpkin Propulsion System Aiming • Need to be able to aim in both vertical and horizontal directions • Swiveling plate for horizontal direction • 2 options for vertical direction

  17. Idaho APPS Advanced Pumpkin Propulsion System Horizontal Aiming • Barrel sits on swiveling plate • Plate is lockable

  18. Idaho APPS Advanced Pumpkin Propulsion System Vertical Aiming Option 1: Rack n Pinion on barrel Option 2: Scissor Style carjack

  19. Idaho APPS Advanced Pumpkin Propulsion System Design Independent Components Cost Estimation Base and Wheels $ 594 $ 560 Barrel – 10” SCH 80 PVC $ 100 Aiming Mechanism Fasteners & Miscellaneous $ 100 $ 1354 Subtotal $ 135 10 % Contingency $ 1489 Design Independent Components Subtotal

  20. Idaho APPS Advanced Pumpkin Propulsion System Compressed Air Cost Estimation Valves, Elbows, Wye $ 270 $ 300 Compressor $ 170 Air Tanks Subtotal $ 740 $ 74 10 % Contingency $ 814 Compressed Air Subtotal

  21. Idaho APPS Advanced Pumpkin Propulsion System Dual Springs & Winch Cost Estimation Compression Springs (4 Qty) $ 324 $ 200 Winch $ 75 Sabot (3/4” steel plate) Subtotal $ 599 $ 60 10 % Contingency $ 659 Dual Springs & Winch Subtotal

  22. Idaho APPS Advanced Pumpkin Propulsion System Extension Springs & Pulleys Cost Estimation Extension Springs (12 Qty) $ 240 $ 140 Pulleys (12 Qty) $ 25 Sabot (canvas) Subtotal $ 405 $ 41 10 % Contingency $ 446 Extension Springs & Pulleys Subtotal

  23. Idaho APPS Advanced Pumpkin Propulsion System Compressed Air Extension Springs & Pulleys Total Cost Estimation Dual Springs & Winch Independent Components $ 1489 $ 1489 $ 1489 System Subtotal $ 814 $ 569 $ 446 System Total $ 2303 $ 2058 $ 1935

  24. Idaho APPS Advanced Pumpkin Propulsion System Decision Matrix Air Pressure Dual Springs Extension Springs Weight Ease of Use 8.8 50 6.2 7.6 6 Cost 8 30 7 8 6.1 20 6 Ease of Design/Manufacturing 780 742 100 640 Higher value indicates better option

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