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Old 25-02-2007, 22:28   #1
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Wind Generator Harmonics/Noise

Does anybody know of a solution for wind generator harmonics being transmitted to the hull via the support pole and two supporting brace poles? I have a Rutland wind generator, which itself runs very quiet; but the harmonics seem to be amplified by the hull of the boat. I have tried a couple of rap around shot bags at the base of the support for minimal affect.
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Paul
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Old 25-02-2007, 22:45   #2
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Only ideas that occur to me are ...

Change the length of the poles to change their harmonic frequency

or

Insert thick lumps of rubber between the poles and the pole mounts (but there would need to be a decent thickness of rubber and it musn't be through bolted which might be hard to achieve whilst having a physically strong connection)

Or rubber mounts between the wind generator and its mountings at the top of the pole
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Old 26-02-2007, 07:36   #3
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I have a stern mounted KISS ona 12 foot pole. The supporting braces are very long and Makai got similar noises generated from the vibrating suport tubes.

As mentioned priviously I to added the bushing on all of the mounts and it helped. Then I took rubber hose (couple of feet) that very tightly fit the inside of the support tubes. Using a line knotted at the end and a washer that fit inside the support brace but large enough to match the diameter of the hose and dish worked it into the tube about half way.

This made the whole setup so quiet we can bearlyhere anything now. It also doesn't alter the appearance so it has a nice clean professional installed look, rather than an add on.

The cost.....zip found the hose in the garbage bin and probably a pennies worth of dish soap.
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Old 26-02-2007, 08:39   #4
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On my Air-X the mounting poles came with bushings between the poles and deck mount pieces, and I get no vibration noises.
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Old 26-02-2007, 21:23   #5
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Captain Bill,
So does the rubber hose just sit in the inside of the support tubes?
What about the main support pole; does that have a rubber hose inside it too?
Cheers
Paul

s/v Solace

http://web.mac.com/paulngina
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Old 27-02-2007, 06:16   #6
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Hose

You want the hose to be a tight fit. The hose then acts as a dampener. You could probably do it with the main pole, but I found Makai didn't need it, even though it is exceptionally long. I used a thick walled stainless commerical railing(all I could get in Bonaire) rather than a thinner alum or stainless tube. So the over built main pole appears to be rigid enough or have the right combo of lenght to avoid generating noise.

It is fairly easy and in expensive, so if you did the main pole it would cost much.
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