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Old 08-30-2011, 10:35 PM   #2
Marin
Scraping Paint
 
City: -
Join Date: Oct 2007
Posts: 13,745
RE: A singing propeller

Not in any order, reasons I have heard for this are blades out of true, edges too sharp, blade pitches not all equal, blade widths or lengths not equal. If you don't have any vibration in the boat the blade differences will be very slight but it apparently doesn't take much to start a high-pitch vibration. The trailing edges of the props sometimes seem to be the culprit, too.

Transmissions can whine, too.
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