For more details, see http://nerdfever.com/?page_id=695
2 October 2010, Amesbury MA (CMASS) -- Flight #31, "Rev 4a" hardware flight #6
Still photographer: None
Video photographer: Dave
1. Booster: Thrud
2. Motor: Cesaroni 163H133BS-14A
3. Ejection: Electronic
4. Electronics: Rev4a hardware, PA6 GPS, AD4 altimeter (backup)
5. Launch detection: Electronic
6. Recovery: NASA NPW5 steerable (SuperChute)
1. Attempt GPS-steered parachute navigation back to launch site
Parachute did not deploy properly due to line tangling. Crash with minor damage.
Rocket spent a lot of time on the pad with servo running prior to launch, due to 3 failed attempts to launch N2O hybrid motor (there wasn't enough N2O in the tank). On the 4th launch attempt, rocket flew on a Cesaroni conventional motor.
Good liftoff. Parachute ejected near apogee (maybe a little past). Parachute was badly tangled and did not inflate. High speed landing in draggy configuration; minor damage.
Both ejection charges had fired upon recovery. Battery was at 8.02 volts (unloaded) several days after flight (still mostly charged).
Per on-board altimeter, apogee was at 767.5 feet AGL, which was also the ejection altitude. Descent (and impact) speed was 36.3 mph -- enough for minor damage. Total flight time was 22.5 seconds.
Satellite lock went from 9 at launch to 5 (at apogee) then 1 (after ejection). This recovered during descent to 5 at t200 mS after ejection, then 6 for one sample about 2.3 seconds after that. At about 300 feet AGL 8 satellites were locked, at about 8 seconds after apogee. This seems adequate for navigation.
Objective 1 -- Failed
a. A system to avoid line tangling is needed.