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post #1 of 3 Old 02-22-2016 Thread Starter
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At a local boat yard, I've looked at several used boats that have a bass drum-like sound when I pound their hulls with my fist. On some of them I have even seen them move as they vibrate. I tried that with a new Compac cat boat and it was like a rock in comparison. I suspect the used boats are suffering from "panting" and the hulls are simply worn out. Should all sailboats have a rock solid feel to the hull?
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post #2 of 3 Old 02-22-2016
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Re: Hulls

It depends on the size of the hull (=hull thickness) and where you are pounding (internal structures). Some bigger hulls have a core (balsa or synthetic foam), and if there is separation between fiberglass and the core, there is an odd, hollow sound if you tap that area. You can search for the make and type of a boat in question to see if it has a core. Core separation in the hull is a very serious matter.

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post #3 of 3 Old 02-22-2016
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Re: Hulls

Depends also on the original quality of the boat - lots of the cheaper ones were like that when new.

Usually the flatter panels between the mast and the bow were where that showed up. It's fairly common to have to put some reinforcing there - sort of stringers glassed in the V-berth area.

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