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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
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Objective Idaho APPS Advanced Pumpkin Propulsion System Design and build a pumpkin cannon for the Clearwater Corn Maze in Lewiston, ID
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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 Idaho APPS Advanced Pumpkin Propulsion System
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Needs - Qualitative Aesthetically pleasing Weather protection Aiming mechanism Trigger lock for overnight protection Idaho APPS Advanced Pumpkin Propulsion System
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Wants - Quantitative Idaho APPS Advanced Pumpkin Propulsion System 1 Minute recovery time -Qualitative Hatch on barrel for loading No age limit for use No hearing protection
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Zero Order Math Model Idaho APPS Advanced Pumpkin Propulsion System
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Position as a Function of Time Idaho APPS Advanced Pumpkin Propulsion System
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Design Options Idaho APPS Advanced Pumpkin Propulsion System 3 Designs Compressed Air Dual Spring & Winch Extension Spring & Pulleys
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Idaho APPS Advanced Pumpkin Propulsion System Tank 2 Tank 1 Ball Valves Compressor Compressed Air Layout
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Idaho APPS Advanced Pumpkin Propulsion System Compressed Air Propulsion Pumpkin Support Sabot selection Barrel Lubrication vs. Rollers or Bearings The Barrel
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Spring Propulsion Dual Springs & Winch Compression springs Winch provides mechanical advantage Winch has disconnect Reconnection of cable Idaho APPS Advanced Pumpkin Propulsion System
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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 Dual Springs & Winch
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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
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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
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Base Idaho APPS Advanced Pumpkin Propulsion System
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Idaho APPS Advanced Pumpkin Propulsion System Need to be able to aim in both vertical and horizontal directions Swiveling plate for horizontal direction 2 options for vertical direction Aiming
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Idaho APPS Advanced Pumpkin Propulsion System Barrel sits on swiveling plate Plate is lockable Horizontal Aiming
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Idaho APPS Advanced Pumpkin Propulsion System Option 1: Rack n Pinion on barrel Vertical Aiming Option 2: Scissor Style carjack
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Cost Estimation Idaho APPS Advanced Pumpkin Propulsion System Design Independent Components Design Independent Components Subtotal Base and Wheels Barrel – 10” SCH 80 PVC Aiming Mechanism Fasteners & Miscellaneous Subtotal $ 594 $ 560 $ 100 10 % Contingency $ 1354 $ 135 $ 1489
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Valves, Elbows, Wye Compressor Air Tanks Subtotal 10 % Contingency $ 270 $ 300 $ 170 $ 740 $ 74 $ 814 Compressed Air Subtotal Cost Estimation Idaho APPS Advanced Pumpkin Propulsion System Compressed Air
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Compression Springs (4 Qty) Winch Sabot (3/4” steel plate) Subtotal 10 % Contingency $ 324 $ 200 $ 75 $ 599 $ 60 $ 659 Dual Springs & Winch Subtotal Cost Estimation Idaho APPS Advanced Pumpkin Propulsion System Dual Springs & Winch
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Extension Springs (12 Qty) Pulleys (12 Qty) Sabot (canvas) Subtotal 10 % Contingency $ 240 $ 140 $ 25 $ 405 $ 41 $ 446 Extension Springs & Pulleys Subtotal Cost Estimation Idaho APPS Advanced Pumpkin Propulsion System Extension Springs & Pulleys
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Total Cost Estimation Idaho APPS Advanced Pumpkin Propulsion System Compressed Air Extension Springs & Pulleys Independent Components System Subtotal System Total $ 1489 $ 814 $ 2303 $ 1489 $ 569 $ 2058 $ 446 $ 1935 Dual Springs & Winch
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Idaho APPS Advanced Pumpkin Propulsion System Weight Dual Springs Air Pressure Ease of Use Cost Ease of Design/Manufacturing 50 30 20 100 6.2 7 6 640 7.6 8 6.1 742 8.8 6 8 780 Extension Springs Decision Matrix Higher value indicates better option
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