After about 30 flights, the trimming is coming along pretty well but I've got a big problem with the spinner. This plane uses a 3 1/2" spinner and it vibrates so badly that I can't even let it get up to full rpm. I've tried 3 different models, 2 carbon fiber & 1 plastic. It seems like the motor shaft & prop adapter are just too flexy for that much mass hanging out the front. I've tried running it with the motor mount in a vice to test it with the same result. I haven't tried to balance the cones. How would that be done when there's no center hole?
Anyone have any ideas?
John Callentine
John,
I do not think this is a spinner problem. (I am almost certain)
How far does the motor shaft project from the motor?
How far from the mounting face of the motor is the face of the prop adapter/collet ?
Is the motor mounted directly to plywood? (this could be the source of the problem if no hard mounting face)
Is there a metal or G10 mount? (if so how far from the mounting face of the mount is the mounting face of the motor?)
Does the prop track perfectly?
What diameter is the motor shaft?
Measure the run out of the motor shaft with and without side load if possible. (dial indicator on the bench)
What keeps the square mounting box from twisting/racking?
A picture of what the motor is mounted to would be very helpful.
Initially I would try a well balanced and perfectly tracking hard (carbon) prop and see if condition persists.
Incredibly beautiful model!
Kim.