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"Peter Duniho" wrote in message
news:ufgdhue3tnq040@corp.supernews.com...
> "Rich Stowell" wrote in message
> news:77e002cf.0205311831.6ee4a77c@posting.google.com...
> > As for the aerodynamics of a slip, imagine moving from a wings-level,
> > cruise attitude into a progressively steeper slip WHILE PRESERVING THE
> > ORIGINAL TRACK. Aerodynamically, knife-edge flight is the maximum slip
> > possible (90 degrees of bank, but still on track), though its not
> > really available in most airplanes.
>
> Tempting, but Im afraid I dont see how you can say that taking a slip to
> its extreme limits results in knife-edge flight. One of the
characteristics
> of a slip is that the nose is deflected relative to the flight path. In
> knife-edge flight, the nose is aligned with the flight path.

Rich is right, and Im afraid you are wrong. In knife edge flight the nose
is NOT aligned with the flight path as you are saying. It is aligned tangent
to the flight path as it should be. AOA is held at 0 to negate turn, and
lift is supplied by the fuselage body. Richs explanation is exactly correct
in every detail, and in fact is one of the best explanations on this subject
I have ever seen in print.
Im sorry, but you and I seem to disagree again! :-)

Dudley Henriques
International Fighter Pilots Fellowship
Commercial Pilot/Certificated Flight Instructor
Retired

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