
05-17-2011
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Senior Member
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Join Date: Nov 2008
Posts: 1,304
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Quote:
Originally Posted by brak
Could you perhaps elaborate on this "pounding" issue? Meaning - under what conditions would you experience it, how does it feel, is it a problem only because it's noisy and unpleasant or something else etc?
As a mainly monohull sailor I am not sure what to make of it.
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I'm sure this varies with the model; I only know of the 105 MC.
Basically, the bridge deck of a Gemini has very little clearance, perhaps only 3-6 inches, depending on the load. Most cats this size have 16-20 inches of clearance, although there are certainly other that ride low (Prout, Packet Cat). When going to the windward waves hit the underside of the bridge deck with a very solid "whomp" and the floor shudders. It does not slow the boat much--the Gemini is quite good upwind--and does not seem to be a structural concern. However, some find it unpleasant.
On a choppy day on the Chesapeake (20-25 knot winds) the Gemini will strike every third wave, while the PDQ will strike 1-2 times per hour. It less of a problem (all cats) with long period waves.
It is not as noticeable off the wind. It can occur at anchor.
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