RB545

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The RB545 was an air-breathing rocket engine that was proposed to propel a British space shuttle (see HOTOL) to orbit using a single stage.

[edit] Description

The exact details of this engine are covered by the UK's Official Secrets Act and there is consequently little public information about its operation.

Within the atmosphere, hydrogen fuel would be used in a heat exchanger to precool air entering a high overall pressure ratio turbojet-like engine cycle, before being burnt with the air in a rocket motor, to produce a very high velocity propulsive jet.

Once out of the atmosphere, the RB545 would be capable of burning the hydrogen with on-board liquid oxygen as a high efficiency hydrogen/oxygen rocket.

[edit] See also

• ATREX
• Liquid air cycle engine
• SABRE

[edit] External links

• Aerospaceweb.org -good information on HOTOL and a picture of the (secret) RB545