Brief Description: Flew test card 5, vibrations back.
Flew test card #5. All performance numbers within specs..... BUT I still have the vibration that I think is coming from the prop. After landing I checked the prop blade pitch angles. I had set them to within 0.1 degree. Now they are 1.3 degrees apart!
This is the second time the blade angles have shifted after an hour or two of flight time. Posted a question to VAF, as follows:
Prop pitch & vibrations
-------------------------------------------------------------------------------- Looking for other's experiences on this topic. I seem to have excessive vibration at propeller RPM frequency. I have re-pitched the prop twice so the blades are within 0.1 degree of each other. After an hour or two of flight the pitch is unequal again. Most recently off by 1.3 degrees. Not sure the vibration is related to the unequal pitch, or just out of balance weight-wise.
I'm not sure if the vibration is causing the pitch change, or the unequal pitch is causing the vibration. I REALLY don't understand how the pitch can change itself.
I am going to call Sensenich tomorrow to see what they say. Anybody have any experience with something like this?
