I'd never heard of it, and there's nothing on the Boeing IDS (Integrated Defense Systems) site when I did a search.
Originally posted by BadgerAnd if there's enough thrust.
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...
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 operationwww.dfrc.nasa.gov...
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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.