I am using in most of my jets PB Royal, no problems there.
Now I have used in 2 of my Jets the Mercury, in FM1 ( without gyro) there are no problems, but if I use FM2 or FM3 I get "knicks" in my movements. In the air you can see clearly that there are uncontroled fast movements ( I call them knicks) of the ail, ele and rudder. As soon as I switch back to FM1 everything is super.
Also when I startup the turbine on the ground in FM2 or FM3 I see these "knicks" !! If I switch back to FM1 everything is perfect.
The gain is absolutly not to high, I experimented with several gains.
So I can't use the gyro function with these Mercury's
I think the mercury's are from one of the firts batches, I bought 3 of them by JP of ZNline.