Cockpit drain question - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 03-27-2012
Member
 
Join Date: Mar 2011
Posts: 95
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
benajah is on a distinguished road
Cockpit drain question

Ive been posting a lot of questions lately. This boat i am working on, the cockpit drains route to thru hulls below the cockpit rather than to the transom. It's a Westerly Cirrus. It does have a nice, deep cockpit, but the sole of the cockpit is still at least 4 or 5 inches above waterline. What might be the design reason to route the drains this way?
I was thinking gravity, needing to give enough vertical space to allow the water to drain.
Reason I'm asking is twofold. I don't like having to leave two seacocks open to let the cockpit drain rainwater, and they really aren't big enough so I thought about enlarging them but don't want to drill a hole in the hull, was thinking about adding a third drain instead, leading to the transom.
But I'm no marine architect, or pretend to be so anyone who knows a lot about this type of thing I would love to hear from

Last edited by benajah; 03-27-2012 at 12:56 AM.
Reply With Quote Share with Facebook
  #2  
Old 03-27-2012
jsaronson's Avatar
Senior Member
 
Join Date: Dec 2011
Posts: 819
Thanks: 2
Thanked 23 Times in 23 Posts
Rep Power: 3
jsaronson is on a distinguished road
Re: Cockpit drain question

I'd worry that in a following sea water would come in thru a transom fitting. The thru-hulls are the standard way to route cockpit drains from my limited experience.
Reply With Quote Share with Facebook
  #3  
Old 03-27-2012
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,604
Thanks: 67
Thanked 178 Times in 174 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Re: Cockpit drain question

If the cockpit sole is truly 4-5 inches above the (travelling) waterline then thru-transom drains may work well. It's actually quite rare for following seas to climb into the cockpit, but if the stern wave rises enough it's possible that you'll back flood that way (though that would already be happening if that was the case)

In any event you could add little flaps on the outside of the transom drains to discourage that. If you have the space and clear routing for draining out the back it may well be a viable option. Just make there there are no low spots in the system that will sit stagnant and grow weird biological cultures all year long.
MedSailor likes this.
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #4  
Old 03-27-2012
Barquito's Avatar
Barquito
 
Join Date: Dec 2007
Location: Madison, WI
Posts: 1,901
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 7
Barquito is on a distinguished road
Re: Cockpit drain question

There are thru hulls with scupper flaps available from various sources.
Attached Thumbnails
Cockpit drain question-scupper.jpg  
Reply With Quote Share with Facebook
  #5  
Old 03-27-2012
Senior Member
 
Join Date: Jul 2006
Location: Corpus Christi, Tx
Posts: 876
Thanks: 8
Thanked 15 Times in 14 Posts
Rep Power: 9
ccriders is on a distinguished road
Re: Cockpit drain question

I think that before reengineering the cockpit drains, I would fill the cockpit with water and see how long it takes to drain. If that is more than 4 to 5 minutes, and you are going off shore then "more better" might be in order.
Westerlys are pretty robust boats built for the harsh conditions around England and one would hope that they have addressed this issue adequately.
During hurricane briefings here, the marina superintendent recommends that all transom aperatures be plugged with nerf balls as boats tied to piers will take waves washing upon their transoms and that sea water will be forced into any exhausts, vents etc., so adding a drain to the transom might be problematic.
John
Reply With Quote Share with Facebook
  #6  
Old 03-27-2012
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,002
Thanks: 0
Thanked 62 Times in 53 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
Re: Cockpit drain question

As Faster said flaps solve the water in problem.

Many cockpit drains are crossed under the cockpit as when heeled the lee one may be below water level otherwise, and they work well.

If it drains slowly an additional one may be installed in the transom, but I would keep the 2 originals.

I believe the op is in San Francisco and it is not in the hurricane belt.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #7  
Old 03-27-2012
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,116
Thanks: 1
Thanked 29 Times in 29 Posts
Rep Power: 4
MarkSF is on a distinguished road
Re: Cockpit drain question

Has anyone ever installed an emergency cockpit bilge pump? My emergency manual one shifts a lot of water quickly, so do some electric bilge pumps.
__________________
1984 Bristol 31.1
Alameda, California, USA
Reply With Quote Share with Facebook
  #8  
Old 03-27-2012
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,002
Thanks: 0
Thanked 62 Times in 53 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
Re: Cockpit drain question

Quote:
Originally Posted by MarkSF View Post
Has anyone ever installed an emergency cockpit bilge pump? My emergency manual one shifts a lot of water quickly, so do some electric bilge pumps.
No real reason to when you can let gravity work for you.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #9  
Old 03-27-2012
Member
 
Join Date: Mar 2011
Posts: 95
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
benajah is on a distinguished road
Quote:
Originally Posted by mitiempo View Post
As Faster said flaps solve the water in problem.

Many cockpit drains are crossed under the cockpit as when heeled the lee one may be below water level otherwise, and they work well.

If it drains slowly an additional one may be installed in the transom, but I would keep the 2 originals.

I believe the op is in San Francisco and it is not in the hurricane belt.
I'm hauling it out this coming Friday for paint and keel inspection. They drain slower than they look like they should so I'll try snaking them and see if they have debris
Reply With Quote Share with Facebook
  #10  
Old 03-28-2012
Barquito's Avatar
Barquito
 
Join Date: Dec 2007
Location: Madison, WI
Posts: 1,901
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 7
Barquito is on a distinguished road
Re: Cockpit drain question

Just to give you some ideas of the numbers from another boat, the Catalina Direct site said (if I remember correctly) that by installing a couple 1.5 inch drains, the C22 cockpit went from drain time of 12 minutes to 2 minutes. If your cockpit is proportionally small compared to the displacement of the boat, maybe that wouldn't be as much of a concern (unless off-shore).
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
mac 25 cockpit drain. jhnblngr MacGregor 4 06-18-2009 12:00 AM
Cal 29 cockpit drain L124C Sailboat Design and Construction 1 05-11-2009 08:22 AM
I 28 cockpit drain and garboard plug TundraDown Islander 2 09-27-2008 08:44 AM
Cockpit drain cross over sailboy21 Gear & Maintenance 8 10-15-2007 08:18 PM
cockpit drain clog Loualfr Gear & Maintenance 4 05-28-2004 03:51 AM


All times are GMT -4. The time now is 06:06 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012