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2012

Idaho APPS (Advanced Pumpkin Propulsion System). 2012. Team Members: Ramzi Sadeddinsarama , Joshua Bouma , Shelby Smith, Kara Peer, Andrew Schmohr Sponsored by CALS, Kaufman Farms, and Lewiston Roundup Association . Problem Definition.

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2012

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  1. Idaho APPS (Advanced Pumpkin Propulsion System) 2012 Team Members: RamziSadeddinsarama, Joshua Bouma, Shelby Smith, Kara Peer, Andrew Schmohr Sponsored by CALS, Kaufman Farms, and Lewiston Roundup Association

  2. Problem Definition The University of Idaho College of Agriculture and Life Sciences has asked our team to design and build a custom pumpkin cannon for their annual Clearwater Corn Maze in Lewiston, Idaho.

  3. Specifications • Accommodate 5”-8” diameter pumpkins • Ability to aim vertically and horizontally • Launch 100 to 150 yards • Ability to move around launch site • Short recovery time (1-3 minutes) • Cost less than $2500 • Design life of 7 years • Safe to operate • Aesthetically pleasing

  4. Concepts Considered Compressed Air Compression Springs Tension Springs

  5. Concept Selection

  6. Prototyping Prototype 1 Chamber Sabot Barrel Ping-pong ball Prototype 2 Chamber Sabot Barrel Ping-pong ball

  7. Basewad vs. Sabot • Used in many propulsion systems (e.g. shotgun) • Basewad provides a flat surface • Sabot cups projectile • Sabot was chosen to accommodate pumpkins of different sizes Small Pumpkin Larger Pumpkin Sabot

  8. Final Design • Accumulator tank equal size to barrel • Horizontal aiming with swivel plate at base • Vertical aiming with jack • Noise level maximum of 120 dB • Safe peak for single event • Mounted to frame with large wheels for easy transport

  9. Math Model and Full Scale Testing • Actual Velocity was slightly lower than predicted velocity • Predicted velocity did not include friction in the barrel

  10. Health and Safety • To use the cannon at the Clearwater Corn Maze, it must pass UI Environmental Health and Safety requirements • Some client specifications could not be met because of these regulations • Future work would include design changes to meet these requirements

  11. Idaho APPS (Advanced Pumpkin Propulsion System) Questions? 2012

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