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The Lockheed Martin X-35B relied upon a unique propulsion system to achieve short-takeoff and vertical landing (STOVL) flight. At the center of the system is a Pratt & Whitney JSF 119-PW-611 turbofan that powered both conventional and STOVL versions of the X-35. Rolls-Royce developed an shaft-driven lift fan attached at the front and a three-bearing swivel-duct nozzle at the rear to generate downward thrust and bleed air reaction control valves called roll control ducts at the sides to provide stability at low speeds.
This integrated system enabled the X-35B to achieve the world's first short takeoff, level supersonic dash, and vertical landing in a single flight on July 20, 2001. The partners in its development, which also included Lockheed Martin, Northrop Grumman, and BAE Systems, received the prestigious Collier Trophy for 2001 from the National Aeronautics Association.
Date
2001
Type
PROPULSION-Turbines (Jet)
Manufacturer
Rolls-Royce North America, Inc.
United Technologies Corporation, Pratt & Whitney Division Physical Description
Type: Turbofan, Twin-Spool, Augmented
Thrust: 186.9 kN (42,000 lb)
Total Vertical Lift Thrust: 164.6 kN (37,000 lb)
Fan: Bypass ratio 0.45, 3-stage
Compressor: 6 stage axial
Combustor: Annular
Turbine: Single stage axial high-pressure, single stage axial low pressure
Weight: 1,771 kg (3,900 lb)
Dimensions
Length 516 cm (16.9 ft), Diameter 120 cm (46 in.) (Approximate) Inventory Number
A20060147000
Credit Line
Transfer from the Department of Defense Joint Strike Fighter Program Office
Data Source
National Air and Space Museum
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