I have a GP Giant super sportster pulled with a Fuji 32B. It's my first gas setup and will be my last if I can't fix the issue

I have been told the level of vibration is greater with gas...no, really?

On my first flight after run-in, I lost a Aileron clevis (Great planes hardware supplied with the kit) cracked and fell off. Landed safely
Also 3 out of 4 CA hinges busted at the Aileron hinge line. Repaired, Second flight. Lost Aileron servo (Missing teeth) Landed safely, Replaced all Hitec Hi-torque servos with Futaba Metal geared servos.

Third flight, port side clevis failed (Threaded end) , landed safely.

The setup is stock per GP
Prop: Well balanced MAS 18x8 (Turning 6900 static, standard day, sea level)
Fuel: 87 Octane, Lube: Klotz 40 to 1
Spinner: Stock with the kit (Prop and Spinner balanced as a unit)
Prop hub extention TIR .0025" (Radial)
Prop hub extention TIR ..002 (Face)


There are some RPM's I must avoid due to a harmonic vibration that sounds as if she is about to come apart at the seams (3850 - 4500) But HF vibration it always present at all RPM's (Realy severe)

This weekend I'm gonna throw an APC prop on it and see if that helps.

I don't believe its the prop, but its worth a try.

One thing I did not check is the TIR of the prop bolt, you don't think it could have been drilled a little off center?

Do they make an ISO mount for the 32B? I'm willing to take the hit on power for the reduction of vibes....

Best regards
~johnny