anybody have the "woofing" blade problems?

My pic had been doing well and after a few mild crashes the main blades now will go"woof" at about 1200 rpm and there is no lift. They have a low pitched growling sound. They track pretty well even when they woof, but you can see a rhymic vibration of the blades, and the rotors seem to be dragging. Won't lift off the ground now. I have checked and rechecked the flybars and flybar control arms. What gives? Thanks in advance.

is it like, "woof, woof, woof, woof"? or "wooooooooooooooof"?

is it CP or FP? what blades?

Its pretty much a stock FP Piccolo, stock blades, head, swash, no mods at all (I have some mods on the way). Once it gets above a certain head speed the blades sound a bit like an old B17 in the distance, there is more vibration, and a rhythmic variation to the sound. Mainly woooooooooof. Or groooooowwwwlllll.

It's weird you say it doesn't lift off.

Mine only did that a few times when the blades got stuck under the fly bars when I started the motor.

Make sure some how the polarity hasn't been reversed on your motor. [img]/ubbthreads/images/icons/blush.gif[/img]

1200 rpm sounds high...perhaps try increasing the pitch of the blades?

Bill B.

BBBIX
I think you have it. I had been tweaking the blades a bit for tracking and I guess I gave both blades a bit of negative pitch. I still have some difficulty getting the tracking right, but it now has great lift.
I am waiting on the ball swash mod, and anti-rotation arm from Rigolith.
My eyes are on the PMP head stiffener, and maybe an aluminum rotor hub, a titanium or ss main rotor shaft, flybar bearings, and a aluminum collar. It adds up quick, but the rotor head is everything.
Thanks for the help!

I am glad to be of help...good luck and have fun!!!

Bill B.