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Prop Shake/Vibration Question

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Prop Shake/Vibration Question


Old 05-02-2010, 05:39 PM
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Join Date: Jul 2009
Location: Fredericksburg, VA
My Boat: 2006 Nortech 3900V w/ Eddie Young 700EFIs
Posts: 784
Default Prop Shake/Vibration Question

New to me 2000 Fountain Lightning with 500EFIs, non staggered, stock length lowers, 29p Hydro Quad IVs. Boat runs excellent, very happy with it. A time or two when getting on plane I had noticed a very slight vibration... occurs and disappears in about 1 second... nothing I had worried about.

However, this past weekend I was loaded heavier than I had been, lots of fuel, cooler, people, etc. I noticed it 4 or 5 times yesterday. I will be trimmed all the way in (tabs all up, or all down, doesn't matter). Just as the boat begins to lay over I get a little shaking. It either clears up as soon as the boat lays over or the minute I begin to trim out. It lasts 1, maybe seconds. It's pronounced enough that my passenger felt it. There is no noise that accompanies it, and I can trim all the way back in while running at speed and it doesn't re occur.

The boat is new to me, 177 hours, and seems to have been well maintained however I cannot speak for the condition of any of it's components.

Is this an area of concern? Is this prop shake? If so what causes it? It doesn't do it EVERY time, and it's not severe, but enough to notice. Any ideas guys?
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Old 05-03-2010, 01:31 AM
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Join Date: Oct 2000
Location: Omaha
My Boat: .......32............. ............Active Thunder....
Posts: 16,830

First thing to do would be to have the props perfectly balanced by a good propshop.
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Old 05-03-2010, 03:19 AM
Join Date: Feb 2008
Location: Englewood, Ohio
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Old 05-03-2010, 06:39 AM
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Join Date: May 2004
Location: Auburn, New York
My Boat: 2012 MTI 36RP; 09 35 Fountain Lightning, sold
Posts: 1,236

Props are cavitating while boat is nosing over onto plane. Depends on water conditions, weight distribution, boat settings.
My 03 35 Lightning would do it occassionally. Good idea to have props balanced but this will likely still occur for a few seconds until props get into better water.
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