Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-21-2018, 01:13 PM   #1
Guru
 
City: Melbourne, FL
Country: USA
Join Date: Dec 2014
Posts: 1,389
Dry stack exhaust covers?

How do Nordhavn (and other dry stack boats) cover the end of the exhaust when they leave the boat to keep the rain out? In many cases, they are quite a distance up in the air.
__________________
Advertisement

stubones99 is offline   Reply With Quote
Old 08-21-2018, 01:59 PM   #2
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,210
Seen sawed off small boat fenders used. Must have climbed to get up there, or used some sort of stick.
__________________

Ski in NC is offline   Reply With Quote
Old 08-21-2018, 02:07 PM   #3
TF Site Team
 
City: Westerly, RI
Country: USA
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 1,655
I've seen buckets placed over them. I've seen fenders stuffed down into them. I've seen people do nothing. I assumed there is a flapper and a drain system inside of them.
Shrew is offline   Reply With Quote
Old 08-21-2018, 02:27 PM   #4
Guru
 
City: Melbourne, FL
Country: USA
Join Date: Dec 2014
Posts: 1,389
I saw the 62 down in Indian Harbor beach and they had what appears to be a bucket over the top... Way up at the top. Perhaps a telescoping boat hook?

https://www.yachtworld.com/boats/199.../United-States
stubones99 is offline   Reply With Quote
Old 08-21-2018, 03:24 PM   #5
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,695
Commercial fishing boats use a 5 gallon bucket or nothing.
__________________
Archie
1984 Monk 36 Hull #46
Currently in Cape May, NJ
High Wire is offline   Reply With Quote
Old 08-21-2018, 10:51 PM   #6
Senior Member
 
Sabre602's Avatar
 
City: NW Washington State
Country: United States
Vessel Name: Kingfisher
Vessel Model: 37' converted gillnetter/crabber
Join Date: Oct 2017
Posts: 329
Yup, bucket. If it's too high to reach you use a pole or boat hook.
__________________
Anson & Donna

Be kind whenever possible. It is always possible. ~The Dalai Lama
Sabre602 is offline   Reply With Quote
Old 08-21-2018, 11:19 PM   #7
Veteran Member
 
City: Kasilof Alaska
Country: Kasilof, Alaska
Join Date: Aug 2015
Posts: 44
If they are built right water will run down the outside shielding but can not get into the inner exhaust piping.
DNT99611 is offline   Reply With Quote
Old 08-21-2018, 11:47 PM   #8
Guru
 
City: ??
Country: ??
Vessel Name: ??
Vessel Model: ??
Join Date: Oct 2007
Posts: 2,408
I cover mine with a piece of pvc pipe that has one end capped.
I used a railfitting and a piece of ss handrail tubing for a handle so I can place and remove it.
Spray painted the cover afterwards as the pipe was a bit rough looking .
My stack od was 4.5" so I used a piece of 6" pvc pipe.
C lectric is offline   Reply With Quote
Old 08-22-2018, 12:57 AM   #9
Guru
 
City: Between Oregon and Alaska
Country: US
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 1,464
Commercial boats with tall stacks use an automatic flapper that automatically covers the exhaust when the exhaust flow stops. Or a bucket. Enough rain can get into the engine.This one is made in the UK out of 316. Exhaust Rain Caps
Attached Images
 
Lepke is offline   Reply With Quote
Old 08-22-2018, 06:19 AM   #10
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,320
An oval hole cut in an old gallon can works for us.


For summer layup we tape the exhaust closed , then install the can with a tie down , for hurricane season.
FF is offline   Reply With Quote
Old 08-22-2018, 08:11 AM   #11
Guru
 
City: Melbourne, FL
Country: USA
Join Date: Dec 2014
Posts: 1,389
The flapper cap won't work in this situation since the end of the pipe is vertical, cut off at an angle facing the rear where the sheared edge is vertical and the pipe is about 45 degrees to the aft. Perhaps there is a rain drain before it goes into the muffler, but I would hope it didn't put the rainwater down the deck due to the teak decking below the exhaust pipe.

There was a can / bucket over the end while it was at the dock so I assume there is a way to cover it up when not in use. Probably a telescoping boat hook or something like that.

I once did an overhaul on an engine that had a vertical exhaust and the bolt in the flapper cap vibrated out, leaving the exhaust pipe collecting water which entered two cylinders. We replaced the two cylinders and did a top end overhaul on the other two. That engine ran over 50,000 hours after that. I have no idea how long it had run before that point...
Attached Thumbnails
Click image for larger version

Name:	Nordhavn 62 1999 Moon River 6584076_20180124094701993_1_XLARGE.jpg
Views:	54
Size:	159.7 KB
ID:	79963  
stubones99 is offline   Reply With Quote
Old 08-22-2018, 09:18 PM   #12
Guru
 
sbu22's Avatar
 
City: New Orleans
Country: US
Vessel Name: Panache
Vessel Model: Viking 43 Double Cabin '76
Join Date: Mar 2011
Posts: 1,078
Would a 90 or double 90 welded on the end cause a noticable flow restriction? Most of the boats I see down here use a bucket.
__________________

sbu22 is offline   Reply With Quote
Reply

Tags
dry exhaust, nordhavn, stack

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 01:08 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012