Sound insulation for a hull

[Whitelighter]

Has anyone tried lining the inside of a hill to reduce the impact of wave slap in bow cabins?

Used to use some pretty impressive stuff when doing high end cars Mauguit stuff years ago, I wonder if a similar modern stick on sound absorbing something would have any affect?

 

[burgundyben]

We found the solution to that was the aft cabin.

 

[jrudge]

I read up on this a while ago.

You can in theory attach swimming noodles to a rope and have them on the outside of the chine. I did this and failed !

Good luck. I don’t think anyone has found a real solution.

 

[Seastoke]

I read up on this a while ago.

You can in theory attach swimming noodles to a rope and have them on the outside of the chine. I did this and failed !

Good luck. I don’t think anyone has found a real solution.

Drink

 

[JerryC]

I tried mooring the rubber dinghy across the bow (in a few marinas) to absorb some of the wave slap, and was able to sleep quite a bit better. Never tried it at anchor though.

 

[BruceK]

Drink

What he said:encouragement:

 

[markc]

The void under our berth is stuffed with foam iife jackets, makes no difference. I actually like the noise though!

 

[Whitelighter]

I don’t mind the more gentle noise.

Problem with sound (and this relates to your ljs) is that it needs total coverage. If you do 98% it will find the 2%
Gaps are not your friend.

 

[BruceK]

On a more serious note, it used to bug me because I wanted it to be like my own bedroom at home. When I thought about it as a boat noise and put it out of my head it ceased to bother me and in fact I have to willingly listen for it to hear it now.

 

[Assassin]

One of the better solutions is the closed cell expanding PU foam, but it needs handling with care and applying properly, and in the correct areas.

 

[MapisM]

I don’t think anyone has found a real solution.

I did.
Well, actually I did not, because I never understood if the solution came courtesy of the sharp bow entry or of the 40mm thick timber hull.
Common sense suggests that both played a role.
Anyway, the final result in that in my old trawler the wave slapping noise, rather than being reduced, simply did not exist.
In a few occasions when the wind turned in the night and built up some waves, it was only the boat pitching that used to wake us up - never the slapping noise.
She was THAT quiet, I kid you not!

 

[jfm]

Not sure this is really possible jez. Fairline's 82 (veteran built except in plywood) was going to have a bow master cabin in one version and they tried lagging hulls but realised it wouldn't work well. If it bothers you (doesn't me) I would find a way to attach foam blocks at the slap point where chine meets the waterline. Like foam blocks attached to 2m long 25mm dia carbon fibre poles that attach to the gunwale/side decks near the bow. Or a bridle/gusset thing that you lower over the bow, pull back, and attach to side deck cleats both sides.

Mapism's method of removing your grp hull and installing a wooden one is also good . Cut corners on the paint and in a few years it will actually become foam :encouragement:

 

[Boathook]

Ear plugs https://www.screwfix.com/p/3m-1100-37db-foam-ear-plugs-200-pairs/50346 Cheaper as well in the short to medium term!

 

[vas]

I guess the only way to do it is to use a stern anchor so the pfaffing sound is at the other end of the hull
will look a tad odd in a moderately busy anchorage though with all boats pointing one way and a Ferretti looking the other...

V.

 

[Ghodula]

+1 for ear plugs!
I've house shared for 6 years and been living aboard for 2 years.

In the house share I thought of all sorts of wild sound insulating tactics, tried ear plugs. Job done.
Same with the living on my Broom Ocean 37, almost nothing wakes me up anyway now as you get acclimatised to normal 'boaty' noises.

When you think about it, taking the problem to the source (Your ear) makes a lot of sense. Why try and insulate you whole hull when you can just insulate two small holes in your head.
Obviously sticking in ear plugs for a good nights kip is going to hamper any chance of not becoming dead from missed gas, smoke, anchor drag alarms but being dead also ensures complete rest

 

[Deleted User YDKXO]

+2 for ear plugs. I use the throwaway foam variety but the individually moulded ones are even better. And ear plugs have the major added advantage of drowning out other unwanted noise "Whats that darling? Sorry can't hear you. Night, night"

 

[Bouba]

+2 for ear plugs. I use the throwaway foam variety but the individually moulded ones are even better. And ear plugs have the major added advantage of drowning out other unwanted noise "Whats that darling? Sorry can't hear you. Night, night"

So that morning that I was standing outside of your boat yelling for you whilst balancing a cake and a bag of ice, when you never answered I was thinking, damn, these Italians make good sound proof boats! Turns out you have earplugs

 

[Deleted User YDKXO]

So that morning that I was standing outside of your boat yelling for you whilst balancing a cake and a bag of ice, when you never answered I was thinking, damn, these Italians make good sound proof boats! Turns out you have earplugs

I knew you were coming J so I put 2 ear plugs in each ear

 

[Elessar]

Has anyone tried lining the inside of a hill to reduce the impact of wave slap in bow cabins?

Used to use some pretty impressive stuff when doing high end cars Mauguit stuff years ago, I wonder if a similar modern stick on sound absorbing something would have any affect?

It’s like seagulls, squeaky fenders, the tick of the eber and slapping halyards.

Boat noises that make the day feel better.

 

[MapisM]

I guess the only way to do it is to use a stern anchor

Agreed.
Luckily, neither myself nor swmbo are sensitive to slapping noise, so with the new to us plastic tub we don't mind the huge difference.
And personally, I would find ear plugs more annoying than the noise itself.

So, since jfm pointed out with no mercy D) that my previous post wasn't exactly helpful, here's a hopefully more useful thought:
Since kedge anchors are a pita to handle manually and fugly to rig permanently astern, on a heavy-ish boat like Seralia I'd rather attach a line with to the anchor chain with a carbine hook, bring it astern, and secure it to a stern cleat - obviously leaving enough slack to the chain, that must run from the bow roller under the whole boat.
Upon recovery, it's sufficient to let the line go, pull the chain with the winch normally, and eventually detach the carbine hook when it reaches the roller, recovering it together with the line.
I only tried that once many years ago, just for the sake of checking if it works, and I can confirm that it does.
The most important thing is to remember to let the line go before starting to recover the chain!