Pratt & Whitney has begun testing the JSF119-611 turbofan STOVL propulsion system for the Lockheed Martin X-35 Joint Strike Fighter (JSF) demonstrator at the company's West Palm Beach facility.
The engine, designated FX662, made its first run on November 10 with the lift fan engaged and operated to 100%. Further testing will include stress surveys and performance calibrations
The propulsion system consists of the JSF119 turbofan, a Rolls-Royce Allison shaft driven lift fan and an R-R three-bearing swivel duct nozzle and roll post nozzles.
Lockheed Martin recently completed 20h of flight tests with the UK Defence Research Agency's Vectored Thrust Advanced Aircraft Control (VAAC) British Aerospace Harrier to evaluate suitability of a sidestick control column for the X-35.
A total of 36 flights were performed, which included circuit flying, approach and transition to and from the hover, proving the suitability of the concept.
The sidestick, manufactured by Calspan, is a variable feel system which is powered by the aircraft's hydraulics.
The stick's characteristics can be varied by the VAAC Harrier's flight control computer.
Source: Flight International
