hull "slapping" noise

You can't be serious?

Why not - certainly some hulls slap more than others, and having a berth at or near chine level can make it it difficult to ignore. It can be like trying to sleep in a drum. Maybe out West where boaters tend to anchor offshore overnight it becomes more noticeable than tying up at one of the many cozy Marinas along the ICW.

There are a couple of paint products that you can apply to the interior of the hull to help deaden the noise, I believe one is called "Noxudol" and is available at West Marine. I have used it before to quiet the bilges and it does work when measured with a db meter. You can further insulate the interior space, in order to muffle the noise.

I also have the same problem with my 455 Carver and think I have a solution. I will be testing a devise this spring. i will let you know if its successful.
it doesn't bother my wife and I, we are in the aft cabin. Some guest don't mine others cant sleep in the fwd berth.

Someone else designed this item and did not want to do it commercially .I will test the idea and let you know for sure if it works.

Know it may sound I'm kidding you, but actually it sends me to sleep such a background sound

Sorry, but this could only come from California. As boaters we're supposed to enjoy these sounds (although halyards clanging still drive me crazy and I try to avoid marinas with a lot of sailboats). However, let me take it seriously for a minute. First, are you sure it's the water slapping? In Florida they have the Spade fish. I call them hull suckers. At night they come alongside of boats that have grass growing at the waterline, lay on their sides and slap their tails against the surface of the water to hold themselves in place as they eat the grass. They'd remind me when it was time to clean my waterline. It's pretty loud. Failing that, try to isolate the area where the slapping is coming from and lay a piece of foam matt or engine room sound dampening material against that area. That should spread and muffle the noise. You could also play white noise in your stateroom.

Really, you think this is a California thing? I have been on boats where the noise is not "soothing" and you would have to plumb in enough white noise to have a rock concert to overcome the issue. Get serious, the poster has a relevant issue. Part of the issue from a design and engineering perspective is thin/solid FRP laminate panels that are somewhat overspanned, and certainly chine design/chine angles. This is not typically the case in an aft master stateroom, but a bunk or forward stateroom towards the bow. I know of a few manufactureres who did modify there chines over time because of this issue.

There have been other threads that discussed the "popping or crackling sound" you may hear from inside the boat, but those have been determined to be small marine life and is not the topic of this thread.

Fish slapping the hull - now that could only come from FL!

Have it on my Post - I sleep soundly, my wife hates it.

PacBlue, Don't get in an uproar. I was being sarcastic. NY sense of humor. Something seldom appreciated on the west coast. Just ask Leno and Letterman.
Enproep, try sticking it with 3M tape, at least until you know it's a permanent solution.
rcrapps, How do you adjust the trim of a boat at anchor?

Enproep


We have the same noise on our boat. It sends me into a deep sleep, my wife sleeps with the pillows covering her ears

Liquor ... drink up. Beer is not strong enough.