On Mon, 10 Jan 2005 10:42:19 -0800, Andy Ross <[EMAIL PROTECTED]> wrote:

> Helicopters have no built-in stability in yaw.

I don't know if that's quite right.  In hover and slow-speed flight,
helicopters have no natural yaw stability (you have to work the
anti-torque pedals constantly); however, in cruise, from the pilot's
perspective, a helicopter should display the same kind of stability
that an airplane does (perhaps a little less, but the same idea). 
There's a name for the transition from hover to cruise (and probably a
better name for 'cruise'), but as a non-rotorhead, I don't know it.

That's not to say, of course, that helicopters or airplanes will fly
straight without any control input -- both need constant attention to
go straight, as Andy suggests.  However, in cruise (or whatever it's
called), you probably want to use the cyclic (=~ailerons) to control
the direction of flight rather than the anti-torque pedals (=~rudder),
unless the helicopter isn't actually flying the way it's pointing.


All the best,


David

-- 
http://www.megginson.com/

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