"Cub Driver" wrote in message
...
On 19 Jun 2004 19:43:08 -0700, (Eunometic)
wrote:

Why is a slab elevator sometimes used?

If you mean a horizontal stabilizer that changes angle (in contrast
to
trim tabs), it's a very old concept. The Piper Cub works that way.
You
have a trim handle like a window crank. Roll it and you turn an
endless cable that turns a jack-screw (worm gear) which raises or
lowers the front of the stabilizer.

I was thinking of an all moving surface. I think its sometimes
refered to as an all flying tailplane as in an F4.

From what i understand: the Cub has a tailplane that changes angle as
well as having elevators.

I guess I wanted to know if the all moving and flying tailplane
combated control stifness or reversal by its absence of elevators by
some aerodynmic effect or whether it was a way of eliminating
aeroelastic twisting.

I guess if WW2 Spitfires had cub like tailplanes some enterprising
pilot would have cranked himself out of a transonic dive.




all the best -- Dan Ford
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