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Rocket launch in Lincolnshire, 1999
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R-DAS FLIGHT #7 DETAILS
 

Flight #: 7
Date: 3rd of February, 2002
Venue: Pete's Farm, Heckington, Lincolnshire
R-DAS Type: R-DAS Compact
R-DAS firmware: 3.1
R-DAS Recorded Altitude: 2352 feet (713 metres)
Apogee - Charge Firing Delta-t: 0.7 seconds
Apogee - Charge Firing Delta-h: 0 feet (0 metres)
Total Time of Flight: 102 seconds
Apogee - Charge Firing h Variance: 0%
Descent Rate at Apogee Deployment: 0 feet per second (0 metres per second)
R-DAS Flight Mode: Apogee & Main Ejection (breakwire launch detection & smart recovery)
Launch Vehicle Diameter: 4 inches
Launch Vehicle Length: 5 feet 6 inches
Launch Vehicle Propulsion: Hypertek J-250 Hybrid
440/54-125-J (0.125 injector orifice)
Fins: 4 clipped swept deltas (Aerofoiled)
Launch System: Rail Launch
Finish: Unfinished
Ejection Method: Electronic Deployment using apogee charge in SafeEject canister, then main charge in SafeEject canister as backup
Ejection Ignition Type: Daveyfire igniters (electric matches)
Launch Vehicle Mass: 3.5 kg (vehicle with hybrid motor but no oxidiser loaded)
Total Propellant Mass: 405 grams
Total Loaded Motor Mass: 1294 grams
Total Impulse: 737 Newton seconds
Comments

The first flight of this rocket, launched on the Hypertek J-250 hybrid rocket motor (using a 440cc oxidiser tank). Launched in moderate winds (unusually moderate for this launch site!), the rocket followed a pretty straight trajectory. For this flight, single stage recovery was used, but due to the drift under chute, future flights will make use of 2-stage recovery. The ejection charges used were a bit agressive, and the chute bay tube ended up with a very nasty zipper, however, the descent, under a 44" PML parachute was quite gentle.

The R-DAS used breakwire launch triggering with smart recovery. This option was chosen because the oscillation in Hypertek motor combustion has been known to result in irregular launch triggering of the R-DAS. The breakwire and smart recovery option worked perfectly, and both ejection channels fired on cue.

Thrust Section of Flight

Wed, Dec 25, 2024, 07:32 GMT (138) 7:14 16:17 82 %
 
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 Richard Osborne - 1995-2006