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

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

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

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

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

Zero Order Math Model Idaho APPS Advanced Pumpkin Propulsion System

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

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

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

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

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

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

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

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

Base Idaho APPS Advanced Pumpkin Propulsion System

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

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

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

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 $ % Contingency $ 1354 $ 135 $ 1489

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

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

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

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

Idaho APPS Advanced Pumpkin Propulsion System Weight Dual Springs Air Pressure Ease of Use Cost Ease of Design/Manufacturing Extension Springs Decision Matrix Higher value indicates better option