Occasionally I read that the angular momentum of the turbine shaft and wheels will cause gyroscopic forces making 3-D flying of a turbine powered model helicopter impossible.

My Jetcopter weighs in at 20 lb fully fueled, and I can only get -4 to +11 or so on the collective, so it's not going to 3D like a 10 lb machine.

Still, I thought, I could try something. I can't tell whether anything happens with the pitch axis coupling to the yaw axis since the gyro would hide it. However the yaw axis has only the tail rotor to affect it. The turbine will couple yaw to pitch, and the tail rotor will couple yaw to roll.

I cranked up the rudder ATV to get a decent yaw rate (a bit more than 1/s) and observed the result....

I couldn't see anything, but my spotter thought he may have seen the tail move out of line a bit in the expected direction, but that could have been me bumping the cyclic a bit.

Has anyone else tried this?