The Pratt & Whitney J58, company designation JT11D-20, is the afterburning turbojet that powered the Lockheed A-12, YF-12 and SR-71 at speeds up to about 3,200 km/h. It worked as a conventional turbojet for take-off and acceleration to Mach 2, then used a permanent compressor bleed to the afterburner above Mach 2, which is why it is often described as acting like a turboramjet. Its origins lie in the larger JT9 (J91), and it was first developed for the Martin P6M flying boat before the Lockheed aircraft adopted it. The engine ran on the low-vapor-pressure fuel JP-7 and was lit with triethyl borane. Pratt & Whitney redesigned it for Mach 3.2 flight with materials such as directionally solidified Mar-M200 and Astroloy, and as of 2021 it remained the only known aircraft engine designed for continuous maximum afterburner at high Mach cruise.
Facts
Classification
Fuel or Cycle Displacement or Thrust113.43 kN (25,500 lbf) installed with afterburner, JT11D-20 1 Connections
Of Make
Source Pratt & Whitney J58 (Wikipedia)
In the Other Atlases
Manufactured By
Also in Business Atlas: the manufacturer of this subject.
Source Pratt & Whitney J58 (Wikipedia)Development, MaterialsQuote, Development, Materials
The development of the J58 involved some of the most challenging metallurgical development problems experienced by Pratt & Whitney Aircraft so far
Sources
1. Pratt & Whitney J58 (Wikipedia)
Specifications (JT11D-20), fuel type
Fuel type: JP-7, JP-4 or JP-5 for emergency refuelling from any tanker (Mach 1.5 limit)
Specifications (JT11D-20), performance
Maximum thrust: on a standard day at sea level, zero airspeed: installed 25,500 pounds-force (113.43 kN) wet
Development, Materials
The development of the J58 involved some of the most challenging metallurgical development problems experienced by Pratt & Whitney Aircraft so far
Of Make: Pratt & Whitney, Lead
The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft.
In Group: Turbojet and Turbofan Engines, Lead
The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft.
Part Of: Lockheed A-12, Lead
The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft.
Part Of: Lockheed YF-12, Lead
The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft.
Part Of: Lockheed SR-71 Blackbird, Lead
The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft.
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