gyro effect

[KMR]

Hi all,
With our engines, have any long time fliers noticed any gyro effect greater than what a prop would induce? Surely, it wouldn't be as profound as the old rotary engine, but it's still a good chunk of mass spinning right along. How would it effect a turn or some manoeuvre that might be of interest. Curiousity is nagging me.

[vintage1]

Definitely.

Flying a large brushed motor fast in bumpy air, every bump causes a tail wag too.

[JetPlaneFlyer]

The prop is probably the largest contributor to Gyroscopic Precession because it has the greater diameter and so probably the largest moment of inertia, although any part that spins adds to the overall precession effect

The effect you would expect to see is a coupling between pich and yaw and vise-versa. On a model with conventional prop rotation and the motor in the traditional tractor nose mounted position then you would get a nose up pitch when the model turned left and nose down when turning right. The opposite also applies; you would get a right yaw when the you pushed the nose down and a left yaw when you pulled up.

That's the theory but i cant say i've ever noticed it in practice.

Steve

[vintage1]

In my case the motor - permax 450 turbo, was definitely the gyro component, not the 6x4 prop..you could actually feel it a bit when the motor was running.

I think the motor comprised 1/3rd the plane weight roughly. Doing about 15k prolly. Not sure.

The other interesting effect was how much MORE current it drew ACCELERATING the motor than running WOT. WOT was 19A or so, but opening the throttle sharply saw peaks in the 25A + region..

[rebell]

http://www.rcgroups.com/forums/showthread.php?t=695809&page=1&pp=50

[KMR]

Appreciated ..good stuff!

[mnowell129]

I notice precession every time I do a lomcevak. You use the precession to make the airplane tumble. Also flat spins.