On Mon, 2 Feb 2004 15:16:31 UTC, Pete Zeugma
wrote:


: you
: create an inward pointing force caused by the fuselage
: (along with a
: rearward componenet -- drag).

: Please, expand on this 'force', from an aerodynamics
: point of veiw. I'd love to know what law of physics
: you have created this thrust vector from.

May I jump in? He's right, and it's dead easy, really. If the fuselage
is yawed to the right, the airflow comes from the left. Which tends to
push the big front big - the cockpit - to the right. And I'm an
aerodynamicist, amongst other things.

: in order to keep the wings level while applying yaw,
: you have to apply a roll moment to counter the secondary
: roll moment caused by the yaw. This puts the aircraft
: back into equilibrium by force. If you release the
: aileron, the secondary roll moment caused by the yaw
: will eventually bank the aircraft into a turn.

Whoops. I think you are confusing the effects of yawing and the
effects of being yawed. As you yaw, one wing moves faster than the
other and produces more lift, tending to roll the glider unless
prevented. But once you are yawed, this effect ends. There may be
other effects requiring use of aileron while yawed - sweep forward in
the wings, for example.

: Stick
: an engine into the equation, and it all changes.

Not very much changes, actually.

Ian