F-15ACTIVE, page 1
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reply posted on 22-11-2004 @ 03:07 PM by Cjwinnit
I would guess, Maybe F-15 + AESA?



reply posted on 22-11-2004 @ 03:12 PM by elevatedone
www.dfrc.nasa.gov...

here is a link to pictures of it....




[edit on 22-11-2004 by elevatedone]


reply posted on 22-11-2004 @ 06:31 PM by Badger
I'm afraid that the F15 Active isn't (or at least wasn't the last I heard) any kind of new develpment that may see production. It was purely an experimental NASA backed project to explore control methods for damaged aircraft. I believe that the project stemmed from an F15 that managed to recover to base safely after loosing the best part of an entire wing. This set people thinking about how modern flight control computers might be able to save otherwise doomed aircraft and the Active was simply a project to explore what kind of systems could be developed to achieve this.

The canards are simply modified tailplanes bolted on to the front of the aircraft, and the idea was to see how a digital flight control system could allow a pilot to achieve controlled flight using all available control surfaces plus engine thrust to retain control of an otherwise mortally damaged aircraft that has lost one or more of its normal flight control surfaces.

It certainly was never claimed to be any kind of combat capability enhancement or development. A very interesting project in its own right though in my opinion, which demostrated with some degree of success that digital flight control systems could compensate reasonably well for the loss of traditional elements.

In a sense I guess it proved the claim that digital fly by wire systems could keep a grand piano in the air if the software is good enough. But hey, anyone who knows much about the Eurofighter Typhoon's total lack of conventional aerodynamics could back that theory up.

Very smart piece of engineering the F15 Active. Very smart indeed.


reply posted on 24-11-2004 @ 03:19 PM by E_T
Originally posted by Badger
In a sense I guess it proved the claim that digital fly by wire systems could keep a grand piano in the air if the software is good enough...
And if there's enough thrust.

Research flights with the F-15 HIDEC began in the summer of 1990 on a program to optimize total aircraft engine performance during steady-state engine operation
...
Several accidents in which part or all of an aircraft's flight control system was lost prompted Dryden to establish a research program to investigate the capability of a "propulsion controlled aircraft" (PCA), using only engine thrust for flight control.

The NASA F-15 was modified to serve as the first-ever aircraft to intentionally demonstrate this PCA capability.

Initial flight studies with the pilot manually controlling the throttles and all F-15 flight controls locked showed that it was possible to maintain gross control. Altitude could be maintained within a few hundred feet using both throttles together. To climb, thrust would be added; to descend, thrust would be reduced. Heading could be controlled to within a few degrees, using differential throttle to generate yaw, which resulted in roll.

These initial flights also showed there was not enough precise flight control capability to land on a runway. This was due to the small control forces and moments of engine thrust, difficulty in controlling the airplane's shallow dive and climb motion, and difficulty in compensating for the lag in engine response.
www.dfrc.nasa.gov...
With thrust vectoring that would propably work well.


But F-15 ACTIVE is different project.
www.dfrc.nasa.gov...
www.dfrc.nasa.gov...
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