Pratt & Whitney J58 (JT11D-20) Turbojet Engine

National Air and Space Museum

Object Details

Manufacturer
Pratt & Whitney
Physical Description
Type: Turbojet, afterburner
Thrust: 133,440 N (30,000 lb)
Compressor: 8-stage axial
Combustor: Cannular
Turbine: 2-stage
Weight: 2,948 kg (6,500 lb)
Summary
Pratt & Whitney designed this engine for continuous operation at high Mach number flight with compressor inlet temperatures above 400 degrees C (750 degrees F). Development began about 1958, and production began in 1964.
The J58 had a single-shaft rotor design, with an 8.8:1 pressure ratio compressor, which incorporated a unique compressor bleed bypass at high Mach number. When opened, bypass valves bled air from the fourth stage, and six ducts routed it around the compressor rear stages, combustor, and turbine. The bleed air re-entered the turbine exhaust around the front of the afterburner where it was used for increased thrust and cooling. The main fuel control scheduled transition to bypass operation as a function of compressor inlet temperature and engine speed. For extreme high-altitude and high-speed environment operation, the engine required special fuel and oil.
Two J58 engines powered each Lockheed A-12 and YF-12 interceptor, and the SR-71 Blackbird reconnaissance and SR-71B trainer aircraft.
Credit Line
Transferred from the U.S. Air Force, Norton AFB, California
Circa 1965
Inventory Number
A19920006000
Restrictions & Rights
Usage conditions apply
Type
PROPULSION-Turbines (Jet)
Materials
Aluminum, Ceramic, Inconel, Plastic, Steel
Dimensions
Overall: 8690 lb. (3941.8kg)
Other: 180 x 50in. (457.2 x 127cm)
Overall: 203.2 × 609.6cm (6 ft. 8 in. × 20 ft.)
Country of Origin
United States of America
See more items in
National Air and Space Museum Collection
Location
National Air and Space Museum in Washington, DC
Exhibition
Nation of Speed
National Air and Space Museum
Record ID
nasm_A19920006000
Metadata Usage (text)
Not determined
GUID (Link to Original Record)
http://n2t.net/ark:/65665/nv9ed15b09c-dec5-4f2d-bb29-773dfdaf75fd
Large circular black engine on a wheeled black base. The number 360 is in white on the front of the base.
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Large circular black engine on a wheeled black base. The number 360 is in white on the front of the base.
Angled side view of the black engine. There is a series of wires and pipes covering the side of the engine.
Side view of the black engine. On the left there is a large gray structure with white and blue designs inside it.
Interior view of the black engine's large gray structure. It is mostly white with black rings visible farther inside it.
Front view of the interior of the large gray structure. The white leads to several white rings around a black center.
Side view of a blue and gray circular structure. There are multiple circles of holes in the structure.
Side view of the black engine. Next to the gray structure there are several pipes intertwined with each other.
Side view of the black engine. A bronze square with dots on it is surrounded by several pipes and wires.
Front view of the black engine's turbine. There is a bronze circle in the center, and pipes surround the edges of the turbine.
Side view of the black engine. There is a series of wires and pipes covering the side of the engine.