"Friedrich Ostertag" wrote in message
...
Hi George,

I believe it would be the other way round. Nose down will induce a
yaw to the right, nose up will induce yaw to the left.

Nope. Bring the tail up during the takeoff roll on my plane, and she
will try hard to make a left turn. My prop is a tractor that rotates
clockwise when seen from the cockpit.

You are right!

I got it mixed up - for that mentioned "rule of the right hand" the
thumb has to be the axis of gyroscopic rotation (prop) while the index
finger represents the imposed rotation, in this case nose down resp
tail up, axis pointing to the left. Thus the middle finger is pointing
up, indicating an induced rotation or yaw to the left.

I remember it as: If you push on a gyroscope, where you push stays there
but the point 90 degrees around the periphery in the direction of the gyro
rotation moves in the direction of the push. (The spinning gyro drags the
push around the periphery 90 degrees before it gets a chance to work :-)