On Fri, 21 Apr 2006 22:25:07 -0800, Scott Skylane wrote:

This is normal (to a degree). McCauley calls it "Blade Shake", and is a
result of the fit of the blade root in to the hub bearing. Statically,
there will be some "slop" (up to 1/8" at the tip is acceptable), but
under rotational loads, this "slop" will disappear.

This is ONLY normal for variable pitch propellers.

And even then, we are talking measurements that are barely perceptible to
the human eye. I personally would not have flown that plane without it
being further checked into.

Having been through replacing the front bulkhead (cracked due to unbalanced
prop) and overhauling the spinner due to an unbalance prop, I learned that
balancing is down to a .10 of a gram so there is some serious precision in
the art of the propeller. Prop only has 2400 hours on it (total airframe
time is the same).

Having seen what it took to get my bird back into specs, blade shake would
make me question whether there was a problem more then just the propeller
since we are only talking .125 of an inch.

See http://www.mccauley.textron.com/svcl.../sl1989-2C.pdf for
specific details regarding blade shake.

Allen