Waxwing (rocket motor)
Waxwing was a British solid rocket motor used for apogee kick as the 3rd (upper) stage of the Black Arrow satellite launch vehicles. Waxwing was used to successfully place the Prospero X-3 satellite into low Earth orbit on 28 October 1971, Britain's only satellite launch on an indigenously-developed launch vehicle.
Design and development
Design was by the Rocket Propulsion Establishment (RPE) at Westcott and it was manufactured by Bristol Aerojet. The casing was spherical and the propellant grain used an internal star profile to control the initial burn rate.
- Thrust: 29.4 kN
- Specific impulse: 2700 m/s (278 s) 
- Burn time: 28 s
40 seconds 
- Diameter: 28 in (0.71 m)
- Overall length: 52 in (1.3 m)
- Nozzle length: 22 in (0.56 m)
- Nozzle diameter: 18 in (0.46 m)
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