Due to the high ratio (8:1) of the mass of H2O2 used compared to the kerosene, and also its superior heat characteristics, the H2O2 may also be used to regeneratively cool the engine nozzle before combustion.
In closed cycle engines the pre-combustion chamber used to power any pump turbines needs only to decompose H2O2 to provide energy.
All of these characteristics lead to kerosene / hydrogen peroxide engines being simpler and more reliable to construct than other liquid propellant chemistries.
[14] The Gamma was adapted[16] as the smaller cruise chamber of the two-chamber Stentor rocket engine produced by Armstrong Siddeley for the Blue Steel stand-off missile.
[19] The initial Black Knight vehicles were single-stage rockets designed to test prototype re-entry heads for the proposed Blue Streak strategic ballistic missile.
Testing of the Black Knight began at Woomera, Australia in 1958, but the Blue Streak project was cancelled in 1960.
[21][32] This was an 8 chamber development of Gamma, used for the first stage of the Black Arrow satellite launch vehicle.