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Flight #: 8
Date: 3rd of March, 2002
Venue: EARS, Elsworth, Cambridgeshire
R-DAS Type: R-DAS Compact
R-DAS firmware: 3.1
R-DAS Recorded Altitude: 2495 feet (756 metres)
Apogee - Charge Firing Delta-t: 1.6 seconds
Apogee - Charge Firing Delta-h: 27 feet (8.2 metres)
Descent Rate at Apogee Deployment: 17 feet per second (5.1 metres per second)
R-DAS Flight Mode: Apogee & Main Ejection (breakwire launch detection & smart recovery)
Total Time of Flight: 104 seconds
Apogee - Charge Firing h Variance: 1.1%
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

The second flight of this rocket, launched again on the Hypertek J-250 hybrid rocket motor (using a 440cc oxidiser tank). Launched in moderate winds, the rocket followed a pretty straight trajectory, with some fishtailing on the ascent. Single stage recovery was used, and 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

Sat, Jun 15, 2024, 23:48 GMT (78) 4:34 19:13 30 %
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 Richard Osborne - 1995-2006