Reply
 
Thread Tools Display Modes
 
Old 01-02-2015, 09:01 AM   #1
Guru
 
City: Full Time Cruising East Coast
Country: USA
Vessel Name: Meridian
Vessel Model: Krogen-42
Join Date: Aug 2011
Posts: 756
Chine slap at anchor

Saw a trawler in the mooring field here. This is how he gets rid of wave slapping on the bow. Just a write-up, nothing for sale.
Prevent Wave Clacking FREE | Stop chine noise/clacking/slapping from waves on your boat
__________________
Advertisement

__________________
-------------------------
Terry
Meridian
KK-42097
meridian is offline   Reply With Quote
Old 01-02-2015, 09:46 AM   #2
Senior Member
 
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 473
I've seen this occasionally. In honesty, I never thought this was a 'problem'. Like listening to waves crashing when at the beach, or the wind through the pines up in the mountains, or crickets and frogs on a quiet summer night. But then I also don't understand the idea of trying to keep a boat from rocking at anchor either. After, all...it's a boat on the water, right?


My concern with this is potential for calamity. I like to keep the boat always in a state of 'readiness'. You never know when you might need to fire up the engines. It would be a tough night if the anchor drags AND one of these lines ends up wrapped in the wheel.
__________________

Shrew is offline   Reply With Quote
Old 01-02-2015, 12:51 PM   #3
Senior Member
 
jungpeter's Avatar
 
City: Everett
Country: US
Vessel Name: SPIRIT BEAR
Vessel Model: PACIFIC TRAWLER 40
Join Date: Mar 2013
Posts: 131
Tried it years ago. Didn't work worth poop.

Pete
jungpeter is offline   Reply With Quote
Old 01-02-2015, 12:54 PM   #4
Guru
 
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 2,199
That is a big reason to buy a boat with an aft or midships berth if you can.
bayview is offline   Reply With Quote
Old 01-02-2015, 02:03 PM   #5
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,890
I've had to anchor ass-first a few times to get some decent sleep. That does work, but has its downsides!!! Gets some funny looks, too.
Ski in NC is offline   Reply With Quote
Old 01-02-2015, 09:10 PM   #6
Guru
 
Steve's Avatar
 
City: Thibodaux, Louisiana
Country: USA
Vessel Name: Gumbo
Vessel Model: 2003 Monk 36
Join Date: Oct 2007
Posts: 3,607
Quote:
Originally Posted by Shrew View Post
Snipped
My concern with this is potential for calamity. I like to keep the boat always in a state of 'readiness'. You never know when you might need to fire up the engines. It would be a tough night if the anchor drags AND one of these lines ends up wrapped in the wheel.
The first thing that crossed my mind.
__________________
Steve W.
http://mvgumbo.blogspot.com/
Steve is offline   Reply With Quote
Old 01-03-2015, 07:21 AM   #7
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,534
Most boats stern is far larger than the pointy end.

With a used sail boat winch mounted (great when docking) most anchor recovery is a snap.

Wind anchor loading is from the Sq Ft of boat exposed to the breeze , bow too or stern too its about the same loading.
FF is offline   Reply With Quote
Old 01-03-2015, 10:50 AM   #8
Senior Member
 
Puffin_NT32's Avatar
 
City: Watch Hill RI
Vessel Name: Puffin
Vessel Model: Nordic Tug 32/34
Join Date: Jan 2008
Posts: 104
This "chine slap" issue comes up regularly. Nordic Tugs are notorious for chine slap. I initially went the "preventer" route... effective, but a pain to deploy, a potential entanglement problem in storms, and silly looking to boot. I fixed the problem by filling in the chines with no effect on performance.
Attached Thumbnails
Click image for larger version

Name:	Picture 022.jpg
Views:	233
Size:	110.6 KB
ID:	35974   Click image for larger version

Name:	mods_apr08_3.jpg
Views:	201
Size:	75.3 KB
ID:	35975  
Puffin_NT32 is offline   Reply With Quote
Old 01-03-2015, 11:04 AM   #9
Guru
 
Tony B's Avatar
 
City: Joe Wheeler State Park, Al
Country: Cruising/Live-Aboard USA
Vessel Name: Serenity
Vessel Model: Mainship 36 Dual Cabin -1986
Join Date: Jul 2011
Posts: 1,250
That is exactly the sound that puts me to sleep along with a sailboat halyard clanging back and forth on the mast.
__________________
Cruising the Eastern U.S. Inland Waterways and Gulf Coast. Presently on the ICW in Louisiana and heading Back to Texas.
Tony B is offline   Reply With Quote
Old 01-03-2015, 12:47 PM   #10
Guru
 
Bacchus's Avatar
 
City: Seneca Lake NY
Country: US
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 1,411
Puffin,
I fixed the problem by filling in the chines...

We are new to our Mainship 34T and our only complaint is the noise sleeping forward - would love to find a reasonable fix.
Can you elaborate a little on your fill technique.
Did you start w/ a slab, foam core, etc - secure & fair it in or build it up solid from scratch?
__________________
Don
MS 34 HT Trawler
"Bacchus"
Bacchus is offline   Reply With Quote
Old 01-03-2015, 03:05 PM   #11
Senior Member
 
Wmiii's Avatar
 
City: Bradenton, FL
Country: USA
Vessel Name: OPTIMYSTIQUE
Vessel Model: Mariner 40
Join Date: Oct 2011
Posts: 118
We've slept in the bow of our sailboat for years and very few issues with noise. Now with our new, to us, Europa style trawler, the wave slap is definitely noticeable, especially when at anchor. When at the dock, we never notice it. It's good to see some others with the same slapping concerns. When the wind is really blowing and the boat is hobby horsing, I just have to move to the salon.
Wmiii is offline   Reply With Quote
Old 01-03-2015, 03:13 PM   #12
Guru
 
Heron's Avatar
 
City: Cypress Landing Marina (NC)
Country: USA
Vessel Name: Heron (2)
Vessel Model: '88 Cape Dory 28 Flybridge #115
Join Date: Nov 2014
Posts: 1,084
LOL...So that's what the noise is! I've got the same issue... Never a problem on our old sailboat, but with these spray rails it's really noticeable...so far we've only spent two nights on the oat...I suppose we'll get used to it...

__________________
Steve
Heron is offline   Reply With Quote
Old 01-03-2015, 03:59 PM   #13
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 4,822
Filled in my chines. My glass and paint guy did a great job. Removed the gelcoat to glass and then filled the void with Coosa board and Westsystem with fiber fill. Then 2 layers of biaxal cloth with Westsystem. Finally gelcoat and fairing, ready for barrier coat and paint.

Not a great pic, but you can only tell it where there it red fairing compound.

Click image for larger version

Name:	DSCN0901.jpg
Views:	191
Size:	95.7 KB
ID:	35981

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 01-03-2015, 10:14 PM   #14
Guru
 
healhustler's Avatar
 
City: Longboat Key, FL
Country: USA
Vessel Name: Bucky
Vessel Model: Krogen Manatee 36 North Sea
Join Date: Oct 2009
Posts: 4,181
Quote:
Originally Posted by O C Diver View Post
Filled in my chines. Ted

Yeah, I guess you really won't be needing those chines anymore with the new "trawler power", not that they did much good with the original power-train. I still haven't seen a wake to beat yours under full throttle!!
__________________
Larry

"I'd rather be happy than dignified".
healhustler is offline   Reply With Quote
Old 01-04-2015, 06:55 AM   #15
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 4,822
Quote:
Originally Posted by healhustler View Post
Yeah, I guess you really won't be needing those chines anymore with the new "trawler power", not that they did much good with the original power-train. I still haven't seen a wake to beat yours under full throttle!!
Yes, 9 knots @ 22 GPH in that boat is going to produce a sizeable wake. From what I have read, if she could have gotten over her bow wave 14 to 17 knots would be her planing speed. Maybe with some really big trim tabs. With 107 HP now, it's the slow lane for me.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 01-04-2015, 10:28 AM   #16
Senior Member
 
Puffin_NT32's Avatar
 
City: Watch Hill RI
Vessel Name: Puffin
Vessel Model: Nordic Tug 32/34
Join Date: Jan 2008
Posts: 104
Bacchus,

The process included gridding off gelcoat, bonding in CoreCell foam panels, covered with 2 layers of carbon tape and epoxy resin. The details are described and pictured on the NENTOA.org webstite. Drill down into Great Ideas, "Eliminating Hull Slap". The trick is to determine how much of the chine needs to be filled in, based on your specific hull design.
Puffin_NT32 is offline   Reply With Quote
Old 01-04-2015, 01:02 PM   #17
Guru
 
Bacchus's Avatar
 
City: Seneca Lake NY
Country: US
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 1,411
Puffin,
Thanks - nice write up and pics. Now on my long list of projects to consider.
__________________
Don
MS 34 HT Trawler
"Bacchus"
Bacchus is offline   Reply With Quote
Old 01-04-2015, 01:43 PM   #18
Senior Member
 
Keysdisease's Avatar
 
City: South Florida
Country: USA
Join Date: Sep 2014
Posts: 461
There are treatments that can be applied to the inside of the hull in the forward "splash zone" that will reduce chine slap. Damping products applied above and below the waterline from the bow or crash bulkhead aft to the first bulkhead will reduce the transmission of chine slap. This works all hulls except cored fiberglass, because the core acts as a kind of de-coupler between the inner and outer "skin."
Keysdisease is offline   Reply With Quote
Old 01-04-2015, 01:58 PM   #19
Guru
 
Conrad's Avatar
 
City: Calgary
Country: Canada
Vessel Name: Blue Sky
Vessel Model: Nordic Tugs 42 Hull #001
Join Date: Oct 2007
Posts: 1,553
The previous owner of our Nordic Tug 42 applied teak ceiling to the hull in the forward stateroom, and it seems to have significantly dampened the chine slap sound. At least it doesn't seem bothersome.
Attached Thumbnails
Click image for larger version

Name:	DSC_8119.jpg
Views:	104
Size:	88.8 KB
ID:	36032  
__________________
Conrad
Berthed in
Campbell River BC
Conrad is offline   Reply With Quote
Old 01-05-2015, 10:47 AM   #20
Senior Member
 
Puffin_NT32's Avatar
 
City: Watch Hill RI
Vessel Name: Puffin
Vessel Model: Nordic Tug 32/34
Join Date: Jan 2008
Posts: 104
I didn't mention that the first thing I did was to install 4" of sound deadening foam panels along the inside of the hull, under the forward cabin berth. Softened the slap but did not eliminate it.
__________________

Puffin_NT32 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 04:11 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012