Mighty F-35 Lightning II engine roars to life
September 20, 2006 (by Lieven Dewitte) - The F-35 Lightning II
completed its first series of engine runs on Monday afternoon,
culminating in a full-afterburner test that unleashed 40,000 pounds
of thrust the most ever from a jet-fighter engine.
By comparison, 40,000 pounds of thrust is seen on older engine
models used for commercial airliners. The F-15 fighter can muster
up about 25,000 pounds of thrust.
The testing began on Friday, Sept. 15, when Chief Pilot Jon Beesley
moved a cockpit switch to the "run" position and brought the Pratt
& Whitney F135 engine to life.
While F135 engines already have logged thousands of successful
hours on test stands, Friday's engine start marked the first time
the engine had run in the F-35 aircraft. The milestone kicked off a
final series of ground tests that will lead to the jet's first
flight later this year.
"Starting and running the F135 engine means we're now in the final
stretch leading to first flight, and also that we have greater
insight into the F-35's design as an integrated system," said Dan
Crowley, Lockheed Martin executive vice president and F-35 program
manager.
A unique Integrated Power Package (IPP), produced by Honeywell
Aerospace Electronic Systems, is used to start the engine. The
installed IPP was started for the first time on Sept. 7. It
combines a starter, electrical power supply and environmental
control system in a single unit systems that in previous aircraft
have been separate, stand-alone units.
The engine runs mark the first time that the F-35 has been
completely functional on its own power systems. As the tests
proceeded, Beesley incrementally advanced the throttle until the
engine achieved military power (full power without afterburner) on
Sunday night, and full afterburner on Monday.
Before today's engine start, nine F135 development engines had run
for more than 5,500 hours on test stands. The F135 is an evolution
of the Pratt & Whitney F119 engine, which powers the F-22
Raptor, Lockheed Martin's other 5TH Generation Fighter. Pratt &
Whitney has delivered three flight test engines to support the
F-35's first flights. As the most powerful single-engine fighter in
history, the F-35 Lightning II produces more thrust than most
twin-engine fighters.
Two separate, interchangeable F-35 engines are under development:
the Pratt & Whitney F135 and the GE Rolls-Royce Fighter Engine
Team F136.
Fifteen F-35s will undergo flight testing, seven will be used for
static/ground testing and another will validate the aircraft's
radar signature.
http://www.f-16.net/news_article1985.html
