Steve Geard
Joined: 09 Dec 2013
Posts: 36
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 Posted: Mon Jul 28, 2014 2:14 pm Post subject: Prop harmonic vibrations #2 |
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Steve Geard
Joined: 09 Dec 2013
Posts: 13
PostPosted: Sat Jul 2014 Post subject: Re: harmonic vibration new prop Yak 55m Reply with quote Edit/Delete this post Delete this post
Well we've dynamically balanced this prop installation. We have a whirlwind 20" carbon composite spinner and it only needed 28grams about 18" out to get the dynamic spot on.
Runs ok on the ground. But in the air that harmonic is quite evident.
Especially at high RPM but low power settings such as approach, its so shocking, I'm flying approaches at 80%.
The engineer is thinking a reduction gear issue, these blades are lighter than the standard blades so maybe hide any engine issues less? We have double checked the pitch and diameters are within half a millimeter (1/64 for you Americans Smile the clamps are right out to the edge.
The only thing we didn't do was a static balance because the blades are supposedly very accurate in dimension and weight. Any more hints guys before we pull the prop off and start again?
Thanks Steve New Zealand.
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