R90 tail shaking under climbing

[Aron1]

Hi!

I have a problem with my R90STD.
I changed my old 90SZ-H to a brand new 90SZ-H.

Now the chopper flies well, the engine is OK, but I have
a problem since I changed the engine.

When I start a full pitch climb, the machine - especially the
tail - starts a strange shaking. (Very similar to the gyro
shaking but it is not that. (I reduced the gain down to 25%.
The gyro didn't keep the tail, but the heli shaked the tail again.))


The engine is working smooth.


Do you have any idea?

Aron

[angrycookieman]

Your headspeed may be too high. Just a guess.

[redgiki]

I'd go with "too high head speed" too... my buddy ran into a very similar problem on his R50. He was spinning the wooden blades over 2400RPM, and the bird looked like it wanted to fly apart!

Carbon-fiber blades allowed him to run such a high head speed without the wobbles, but we tamed it down a few hundred RPM regardless, and with plenty of power.