I need the advice of The Morons while you guys are at Valkaria this weekend, please.
I have a weird vibration - I call it a cabin hop - that seems to be airspeed sensitive.
Between 65 and 70 mph.
Is not dependent upon engine rpm, rrpm or gyro attitude.
It manifests itself as a shake - up and down? - of the entire bird, not the stick.
It's pretty violent. If I suck it up, I can fly through it and it's fine from 70 to about 90 - as fast as I care to go.
Same thing happens as I decrease speed back through 70-65mph.
My stick shake isn't bad but it's not perfect, either. I've strung 'em, slung 'em, polished 'em, kissed on 'em and prayed over 'em.
I can't decide if they are tracking correctly or not. Ernie flew 'em and put a beer can shim under one side.
Maybe if we can all put our heads together we can come up with some ideas to try.
Thanks,
Larry