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Posted: Mon Jun 02, 2008 8:40pm

Post Subject: propeller whine

I have a 57ft n/b witha yanmar 2000 engine, aqua drive and 18x12x1.5 rh propeller with standard stern greaser. I recentley hit something hard and as a result buckled one of the propeller fins I have had this replaced with a new propeller of the same size but since then I have a high pitched whine just after tickover speed is reached and reving up and again when reducing back to tick over, I have checked the stern greaser and tightened the stern adjustment nuts could this mean a new shaft and or bearings, I would appreciate your expert oppinion


Posted: Tue Jun 03, 2008 8:43am

Post Subject: propeller whine

Dear Anthony, Once we get into this sort of problem it sometimes looks as if black magic is required. However a recent thread on this exact subject concerning a new prop was started so have a look on opic=15224 As I understand it and because it is a new prop its related to harmonic vibration from the prop so if you do something to make each blade vibrate at a very slightly different frequency the sound goes. The thread suggest slightly deforming each blade with an adjustable spanner or I will add wait until you have put a few knicks in the blade. Please take time to read the thread above. Tony Brooks

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