It was one element of the intended mixed powerplant for combination rocket-jet interceptor aircraft for the Royal Air Force, such as the Saunders-Roe SR.53.
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The conventional Spectre DSpe.5 had been developed alongside a DSpe.4 RATO variant, the latter for the Avro Vulcan and Handley-Page Victor V bombers, another programme subsequently cancelled after a single trial take-off of a Victor from the de Havilland aerodrome at Hatfield.
Olivia de Havilland | de Havilland Canada DHC-6 Twin Otter | De Havilland Mosquito | Spectre (comics) | de Havilland Vampire | de Havilland Mosquito | Spectre | De Havilland Canada DHC-6 Twin Otter | de Havilland | de Havilland Comet | De Havilland Vampire | De Havilland Tiger Moth | de Havilland Tiger Moth | De Havilland Canada DHC-4 Caribou | de Havilland Canada | De Havilland | SPECTRE | :de Havilland Venom | :de Havilland Vampire | De Havilland Puss Moth | de Havilland Gipsy Six | De Havilland Comet | de Havilland Canada DHC-4 Caribou | De Havilland Canada DHC-3 Otter | de Havilland Canada Dash 7 | de Havilland Australia | The Spectre's Bride | Spectre (Blake) | De Havilland Sea Venom | De Havilland Hornet Moth |