Idaho APPS Advanced Pumpkin Propulsion System
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Transcript of Idaho APPS Advanced Pumpkin Propulsion System
Idaho APPSAdvanced Pumpkin Propulsion System
Team MembersAndrew Schmohr
Kara Peer Shelby Smith
Josh Bouma Ramzi Sadeddinsarama
Advisor: Dr. Tom Hess Sponsor: Dr. John Foltz
ObjectiveIdaho APPSAdvanced 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 APPSAdvanced Pumpkin Propulsion System
Needs-Qualitative
• Aesthetically pleasing• Weather protection• Aiming mechanism• Trigger lock for overnight
protection
Idaho APPSAdvanced Pumpkin Propulsion System
Wants-Quantitative
Idaho APPSAdvanced 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 APPSAdvanced Pumpkin Propulsion System
Position as a Function of Time
Idaho APPSAdvanced Pumpkin Propulsion System
Design OptionsIdaho APPSAdvanced Pumpkin Propulsion System
3 Designs• Compressed Air• Dual Spring & Winch• Extension Spring & Pulleys
Idaho APPSAdvanced Pumpkin Propulsion System
Tank 2
Tank 1
Ball Valves
Compressor
Compressed Air Layout
Idaho APPSAdvanced Pumpkin Propulsion System
•Compressed Air Propulsion•Pumpkin Support• Sabot selection•Barrel Lubrication vs. Rollers or Bearings
The Barrel
Spring PropulsionDual Springs &
Winch
• Compression springs• Winch provides
mechanical advantage
• Winch has disconnect• Reconnection of
cable
Idaho APPSAdvanced Pumpkin Propulsion System
• Crank gear ratio of 15.8:1• Disconnect in cable provides measure
of safety• Potential for mechanical failures
Idaho APPSAdvanced Pumpkin Propulsion SystemSpring Propulsion
Dual Springs & Winch
• Springs connected to cables
• Sabot cranked back pulling the springs in tension
• Release of sabot – springs contract
Idaho APPSAdvanced Pumpkin Propulsion SystemSpring Propulsion
Extension Springs & Pulley
Idaho APPSAdvanced Pumpkin Propulsion SystemSpring Propulsion
Extension Springs & Pulley
• Smaller springs• Sabot could tangle• Inner barrel may be required to prevent
tangling• Increased barrel diameter
BaseIdaho APPSAdvanced Pumpkin Propulsion System
Idaho APPSAdvanced 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 APPSAdvanced Pumpkin Propulsion System
• Barrel sits on swiveling plate • Plate is lockable
Horizontal Aiming
Idaho APPSAdvanced Pumpkin Propulsion System
Option 1: Rack n Pinion on
barrel
Vertical AimingOption 2:
Scissor Style carjack
Cost EstimationIdaho APPSAdvanced Pumpkin Propulsion System
Design Independent Components
Design Independent Components Subtotal
Base and WheelsBarrel – 10” SCH 80
PVCAiming MechanismFasteners &
MiscellaneousSubtotal
$ 594$ 560$ 100$ 100
10 % Contingency$
1354$ 135$
1489
Valves, Elbows, WyeCompressor
Air TanksSubtotal
10 % Contingency
$ 270$ 300$ 170$ 740$ 74
$ 814
Compressed Air Subtotal
Cost EstimationIdaho APPSAdvanced 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 EstimationIdaho APPSAdvanced Pumpkin Propulsion System
Dual Springs & Winch
Extension Springs (12 Qty)Pulleys (12 Qty)Sabot (canvas)
Subtotal10 % Contingency
$ 240$ 140
$ 25$ 405$ 41
$ 446
Extension Springs & Pulleys Subtotal
Cost EstimationIdaho APPSAdvanced Pumpkin Propulsion System
Extension Springs & Pulleys
Total Cost Estimation
Idaho APPSAdvanced Pumpkin Propulsion System
Compressed Air
Extension Springs & Pulleys
Independent Components
System Subtotal
System Total
$ 1489
$ 814
$ 2303
$ 1489 $ 1489
$ 569
$ 2058
$ 446
$ 1935
Dual Springs &
Winch
Idaho APPSAdvanced Pumpkin Propulsion System
Weight Dua
l Sp
ringsAir
Pre
ssur
e
Ease of UseCost
Ease of Design/Manufacturing
503020
100
6.276
640
7.68
6.1
742
8.868
780
Exten
sion
Sprin
gs
Decision Matrix
Higher value indicates better option