Bristol Thor

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Bristol Thor
Bristol Thor

The Bristol Thor was a 16" diameter ramjet engine developed by Bristol Aero Engines (later Bristol Siddeley Engines) for the Bristol Bloodhound anti-aircraft missile.

Although Bristol Aero Engines acquired ramjet technology from the US company Marquardt, BAE put considerable effort into developing the Thor unit, including the construction of a high altitude test plant (HATP), with a supersonic test cell, at their Patchway site.

Maximum speed of Bloodhound Mk1 was Mach 2.2, but the much improved Mk 2 was capable of Mach 2.7.


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