Wave Slap -wouldn't believe how loud

[Dragon]

I have a new-to-me 1988 H37. Love the boat, but those small waves are amplified at night in the aft berth. I know about the'wave silencer'...a bit pricey- especially considering costs into Canada and more to carry in a boat with little storage. Has anybody tried putting noise-reducing insulation under the transom?...it's quite a large area so I'm thinking it may work.

 

[john meyer]

I bought some of the foam "spaghetti" that look like pipe insulation but are bright colors, don't have a split down the side and are sold as swim toys.. They are about 5 ft long x 4" diameter. I ran some line down the middle of 3 of them so they are connected, tied the ends to my stantions and surround my stern at night - does the trick.

 

[windward54]

I broke down and purchased the Slap Silencer; bought it from this site. I tried other homemade gadgets but never got the results I wanted. The Slap Silencer works great and turned out to be worth every penny I spent on it.

 

[Benny]

Try turning the boat around to face the waves and the noise in the aft berth should be greatly reduced.

 

[joendj]

We’ve had the slap silencer for 8 years now. Sleeping on the hook in a protected anchorage isn’t bad but in a marina we use it all the time. Seems the waves bounce off the bulkhead and crash into the stern. Best $$ spent for a good nights sleep!
Joe, LI NY

 

[Franklin]

Benny: anchor from stern????

Try turning the boat around to face the waves and the noise in the aft berth should be greatly reduced.

Do you do that Benny? I've only anchored from stern twice and once wasn't so comfortable....Ike might have had something to do with that

I didn't notice an absence of slap the first time I tried it but I wasn't looking for that either. I was testing to see if the boat swings on anchor which it didn't both times I tried it. So I am really curious if it does eliminate the slap.

I've been thinking about leaving the marina here and living off the hook in Galveston for a little while. I'd like to mount my DirecTV to my radar pole on the stern and see if I can get reception if anchored from the stern. With no swing, maybe I can get the dish to point in the right direction. As of now, I have the dish mounted to the dock so when I go to anchor I have no signal.

 

[Benny]

Franklin, at anchor the boat will usually swing to face wind and waves. The slap will usually manifest itself when when tied up at a dock and the noise can usually be reduced by turning the boat around. The only stern anchoring I do is with a lunch hook.

 

[Franklin]

Franklin, at anchor the boat will usually swing to face wind and waves. The slap will usually manifest itself when when tied up at a dock and the noise can usually be reduced by turning the boat around. The only stern anchoring I do is with a lunch hook.

My boat and many others get wave slap while at anchor in the stern due to how it is shaped. The waves slap the underbody as they pass from bow to stern and I believe this is the slap that the poster is talking about. You made it sound like you've anchored stern to the wind/waves and didn't experience those sounds but did when you were anchored bow to the wind/waves. Glad it is cleared up that you are not saying that.

 

[Dragon]

Thanks for the suggestions guys. Will likely try the foam toys ($6) first then break down for the slap silencer if that is not satisfactory.

 

[Bob12321]

I disagree on waves from bow to stern causing this.

We anchor out almost all the time we're on the boat. I only get it at anchor if the waves are coming towards the stern which doesnt happen often. I sometimes get it at the marina if there's a wind creating waves from the stern.

At anchor,normally waves are coming in off the bow and boat is pointing that way so all is fine, however sometimes you do get a situation where winds may be light and boat is lying with remaining wave coming from stern.

I also have to get around to trying the pool noodle!

 

[Franklin]

We anchor out almost all the time we're on the boat. I only get it at anchor if the waves are coming towards the stern which doesnt happen often. I sometimes get it at the marina if there's a wind creating waves from the stern.

At anchor,normally waves are coming in off the bow and boat is pointing that way so all is fine, however sometimes you do get a situation where winds may be light and boat is lying with remaining wave coming from stern.

I also have to get around to trying the pool noodle!

That's your boat, not all boats. It depends on the shape of the hull, mainly the stern. If the hull is in the water the full length of the boat, then you will not get it, but if like my boat and many others where the stern part of the hull raises a few inches out of the water before it ends, then you will get a slap at anchor when the waves are coming from the bow.

 

[Bob12321]

Franklin, I think the stern shape at the waterline of an

80's Hunter 40 is the same as a 37. I therefore expect the same affect. thats why I posted.

Of course there may be some difference I'm not aware of so I'll defer to someone who has an 80's Hunter 37 for confirmation

 

[luvitt]

i thought i was the only one. The slap is HORRIBLE. I didnt go to work today b/c i didnt get a wink of sleep last night. i didnt think there was a solution and was thinking about sleeping in the vberth.

 

[Guest]

Slap

I've not tried this but it should work. Pick up a closed cell foam one half inch thick sleeping pad used for camping. Tie lanyards to each corner of the pad, slide the pad under the stern and use the lanyards to hold the pad in position. The pad should absorb the wave action slapping against the stern part of the hull. You can also find these pads at your local thrift stores for a few dollars.

Terry Cox

 

[Doug/Karen]

Problem solved...

Last year, I purchased two closed-cell camping sleeping pads, installed metal grommets in each corner of each pad, linked them together end-to-end and then slipped them under the stern up against the rudder post and secured them in place with ties to arch base and stanchions. Total cost about $75 including the grommet tool. I have pictures. Contact me if you wish to see them.

 

[bob12321]

brobins75, were you at anchor ? I bet at the dock - thats

when I almost allways encounter the trouble if at all. Luckily winds typically blow from the bow at my doc. I've researched this a lot and it seems to happen when winds are coming at the stern

I rarely have it at anchor

I have an 88 Legend 40

I'm going to try the foam also.

 

[Jeff Bacon]

A quick solution I have used

Our first night in the Bahamas at West End brought 40 mph winds, and we were docked stern to the wind and waves. Horrible slap !

I took a couple of my fenders (about 9 inches in diameter I would guess), tied them together end to end, then ran them under the stern and tied them off to each stern cleat. Worked great !

Jeff