uncleflo
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The SR-71 Pratt & Whitney JT11D-20B J58 Engine
Saved by uncleflo on June 20th, 2014.
The SR-71 Blackbird is powered by two Pratt & Whitney J-58 turbo-ramjets, each developing 32,500 pounds of thrust with afterburning. The critical problems concerning supersonic flight with air breathing engines are concentrated in the air inlet area. The circular air intakes of the SR-71 contain a center body tipped with a conical spike. The spike is movable, forward for takeoff and climb to 30,000 feet after which, as speed builds up, it moves rearward, controlling the amount of air entering the engine. As it does so, Air Inlet Bypass Doors in the side of the nacelle close to establish the correct flow of air through the engine, holding the supersonic shock wave in it's critical position within the inlet. The engine itself operates at subsonic speed.
pratt whitney engine sr-71 black bird blackbird plane military usa defence spy speed description information supersonic guide inlet critical mach ramjet thrust afterburn problem flight concentration spike takeoff climb flow nacelle
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