1. Preliminary Design review
Windward Community College
University of Hawaii

2. Project: Rocket; Leo Hano Payload; Hula Hoop

3. 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

4. Flight Profile Boost Phase Coast Phase Apogee Rapid Decent Phase
Drogue Deployed
Rapid Decent Phase
~60 ft/sec
Main Decent Phase
~20 ft/sec

5. 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

6. Characteristics GPSFlight in nose cone
Variable Drag Configuration (VDR)
Four fin design
Avionics
Featherweight Raven-2
PerfectFlight MAWD
Dual deployment

8. Rocket Stability Center of Pressure: 91.70” Center of Gravity: 75.27”
Caliber: 2.74
Marginally Over-stable

9. Motor Selection Animal Motor Works L777WW Total Impulse: 3180 Ns
Casing: 75mm X 497mm
Average Thrust: N
Peak Thrust: N
Thrust to weight: ~7.5

10. 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

11. Hula Hoop Three perpendicular coils around a non-magnetic sphere
24-bit ADC
EEPROM
BS2p Micro-Controller
3-axis accelerometer (comparison)

12. Timeline

13. Important Dates Recovery deployment testing: 1/22/11
Full-Scale Low-Power test: 3/13/11

14. 1:3.7 Scale Drag Shoe

15. pau