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Old 10-11-2006, 11:30 PM   #1
Ben
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Hummers

This is either a hydrodynamic or stupid question. You choose.

I've noticed over time that certain hulls make a humming sound when on the plane. It seems to be more prevalent on twin outboard boats.

I'd always thought a boat hummed because it didn't know the words but I don't think that's right.
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Old 11-11-2006, 10:16 PM   #2
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Most likely to be motors mounted high, with the props semi-surfacing. surface drives 'hum' like a bastud as the blades leave, and re enter the surface.
How many blades doyour props have Ben?
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Old 11-11-2006, 10:31 PM   #3
Ben
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Country: US
Location: Virginia
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Boat name: A Little Noisy
Boat make: Excalibur 24
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Join Date: Mar 2004
Location: Virginia
Posts: 1,974
Three blade round ear Rakers. The motors are not mounted especially high but it does only happen when the engines are trimmed out a bit.

You've jogged my memory. The Reefer (with a four blade cleaver) did the same thing when trimmed out. Think you have answered my question!
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