Idaho APPS Advanced Pumpkin Propulsion System Team Members

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 Design and build a pumpkin cannon for the Clearwater Corn Maze in Lewiston, ID

Idaho APPS Needs -Quantitative • • • Advanced Pumpkin Propulsion System 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

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

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

Idaho APPS Advanced Pumpkin Propulsion System Zero Order Math Model

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

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

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

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

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

Idaho APPS Advanced Pumpkin Propulsion System Spring Propulsion Dual Springs & Winch • Crank gear ratio of 15. 8: 1 • Disconnect in cable provides measure of safety • Potential for mechanical failures

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

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

Idaho APPS Advanced Pumpkin Propulsion System Base

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

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

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

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

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

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

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

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

Idaho APPS Advanced Pumpkin Propulsion System Pr Air es su re Ease of Use 50 8. 8 6. 2 7. 6 Cost 30 6 7 8 Ease of Design/Manufacturing 20 8 6 6. 1 100 780 640 742 W t ei gh Sp Dua rin l gs Ex t Sp ens rin ion gs Decision Matrix Higher value indicates better option