Hi Everyone. I'm having a problem with my RV12 and am looking for some thoughts on how to resolve it. Some background first. My RV12 E-LSA is a Synergy Air quick built kit started in April 2016 and completed in Sept 2016. First flight was in October 2016. I now have ~30 hours on the plane, and love the way it flies. However, I have a disturbing low frequency vibration, almost a hum, the source of which I've been unable to isolate. I can easily feel it in the rudder pedals, engine controls, instrument panel and canopy.
Other observations:
Occurs at all engine RPMs, may be a little worse between 3000-4000 RPM
Occurs at all airspeeds while airborne
Is NOT present at any RPM while on the ground
Attempts to correct:
Pitched prop blades, identical to 0.1 degree
Carbs balanced by experienced Rotax repairman
Carb floats checked and all found to be ok (2.9gm each)
Gear box removed, checked and reshimmed to Rotax specs
Removed nose wheel fairing (no difference noted)
25 hour Rotax inspection completed with no problems found
Prop dynamically balanced
Checked Engine Isolators per Van's Notification 16-08-10 and found to be correct.
Prop blades returned to Sensenich and balance checked
Any thoughts on where else to look for the source of a bothersome vibration, neither airspeed or RPM dependent, only present while airborne?
Help much appreciated!
Barry
Mequon, WI
2017 Dues Happily Paid
RV12 Flying
Other observations:
Occurs at all engine RPMs, may be a little worse between 3000-4000 RPM
Occurs at all airspeeds while airborne
Is NOT present at any RPM while on the ground
Attempts to correct:
Pitched prop blades, identical to 0.1 degree
Carbs balanced by experienced Rotax repairman
Carb floats checked and all found to be ok (2.9gm each)
Gear box removed, checked and reshimmed to Rotax specs
Removed nose wheel fairing (no difference noted)
25 hour Rotax inspection completed with no problems found
Prop dynamically balanced
Checked Engine Isolators per Van's Notification 16-08-10 and found to be correct.
Prop blades returned to Sensenich and balance checked
Any thoughts on where else to look for the source of a bothersome vibration, neither airspeed or RPM dependent, only present while airborne?
Help much appreciated!
Barry
Mequon, WI
2017 Dues Happily Paid
RV12 Flying