Preliminary Design review Windward Community College University of Hawaii 2010-2011
Project: Rocket; Leo Hano Payload; Hula Hoop
Design Criteria Build a Rocket to be launched to an altitude of 5280 ft. (1 mile) Rocket must carry a scientific payload Rocket must return safely
Flight Profile Boost Phase Coast Phase Apogee Rapid Decent Phase Drogue Deployed Rapid Decent Phase ~60 ft/sec Main Decent Phase ~20 ft/sec
Rocket Design Details Length: 121” Diameter: 6” Weight: 15 lbs., unloaded Weight: ~20 lbs., on the pad Materials: G10 Fiberglass Recovery: Dual Deployment, electronic Propulsion: 75mm AMW L777WW
Characteristics GPSFlight in nose cone Variable Drag Configuration (VDR) Four fin design Avionics Featherweight Raven-2 PerfectFlight MAWD Dual deployment
Rocket Stability Center of Pressure: 91.70” Center of Gravity: 75.27” Caliber: 2.74 Marginally Over-stable
Motor Selection Animal Motor Works L777WW Total Impulse: 3180 Ns Casing: 75mm X 497mm Average Thrust: 774.47 N Peak Thrust: 1000.16 N Thrust to weight: ~7.5
Motor Justification Drag force is linear to ~30 degrees Approximate altitude loss ~1.2%/degree 30 degree deployment yields ~36% loss Must yield max altitude below 7180 ft and above 5280 ft
Hula Hoop Three perpendicular coils around a non-magnetic sphere 24-bit ADC EEPROM BS2p Micro-Controller 3-axis accelerometer (comparison)
Timeline
Important Dates Recovery deployment testing: 1/22/11 Full-Scale Low-Power test: 3/13/11
1:3.7 Scale Drag Shoe
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