darkstar catapult michael whitehead vince wong darkstar catapult engr 5 november 19, 2002
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DarkStar Catapult
Michael WhiteheadVince Wong
DarkStar Catapult
ENGR 5November 19, 2002
Overview
Introduction Constraints Project Objectives Approach
Preliminary Ideas Refinement Implementation Construction & Testing Final Mechanism
Results & Possible Improvements Conclusions Acknowledgements
Introduction
Design of a method to carry a standard Food Aid Package down and inclined ramp trigger upon impact of barrier launch over wall 6’2” tall and land 10 linear feet past barrier
PYTHON-INFESTED JUNGLE BOUNDARY
4 in
4 ft 8 ft
STARTLINE
FAP TARGET SPOT6 ft 2 in
3.5 ft
10 ft 10 ft
Constraints
Dimensions cannot exceed 18”x18”x18”
No pre-constructed devices
No motors or propellants
Total cost $20 or less
Cannot exceed 10 pounds
Objectives
To traverse 7 feet down an inclined launching ramp
Successfully launch a Food Aid Package (FAD) of dimensions 4-3/8” x 4-3/8” x 5-1/2“ weighting 7 ounces over a 6’ 2” wall to a spot 10 feet away from the base of the launching ramp.
Approach
Preliminary Ideas
spring launch powerful version
Approach
Preliminary Ideas
crossbow early form of final design
Approach
Refinement-
Most practical designs, but spring or tubing
Approach
Implementation
trigger
stop bars
originally usingwheels
Approach
Construction and Testing
3/4”x3/4” pieces of wood
surgical tubing for propulsion
movable stainless steel rods for trajectory adjustment
hinge and ram rod trigger design
no wheels
Approach
Final Mechanism Design
Results & Possible Improvements
Results The FAD successfully crossed the barrier and landed in
the desired area during testing, but not during actual competition
20th place, 2 failed, 3rd 9.33’, 3 lbs
Possible Improvements Devise system to keep surgical tubing on the device
permanently
Stronger surgical tubing to prevent stretching
Conclusions
Pilot holes are a necessity
Importance of adjustability
Acknowledgements
Michael’s Father Mark Provided valuable insight in building techniques Provided assistance during more difficult construction
periods