Cockpit drains - Page 2 - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 02-11-2008
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Quote:
Originally Posted by sailboy21 View Post
Why? I have never understood the purpose of that practice

Actually I would second that what is the sense in cross connecting when it is obvious the single point of failure is a drain "pre-filter" being clogged?
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Old 02-11-2008
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GG...the link in post #4 is what you need...can be in plastic as well. I see no need for any check valve in the line based on what you have said. I think a check valve would be more of a problem than a solution as they are prone to stick or get filled with debris.
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Old 02-11-2008
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Quote:
Originally Posted by sailboy21 View Post
Why? I have never understood the purpose of that practice
So when half-a-ton of seawater comes over the lee rail and lands on the low side of the cockpit, all of the crap in the high side cockpit drains is instantly ejected - over the feet of the nearest crew!..
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Cam,
I think the "G" fitting in the link will work, but is it alright to pick this back up tomorrow night so I can take a pic of the cockpit floor. I think you'll agree that choosing the right fitting is a must. I'll try and get up early and get a pic in the morning and get it posted.
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I'd say go with 9 inches.. works for those in the industry... eh?
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Thanks everyone for all the help! Untill tomorrow
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Old 02-12-2008
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Quote:
Originally Posted by sailboy21 View Post
Why? I have never understood the purpose of that practice
I believe it is so that the drain cannot flood the cockpit when the boat is heeled way too much, but that is mostly a wild guess.

I'm wrong, nevermind.

~Matt

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The reason that cocpit drains get crossed is that when the boat is heeled, the leeward drain through hull is likely below water. The water draining out of the scupper will have to push the water through an already flooded hose. If the drains cross, the leeward scupper can drain out the through hull into clear air, a much faster way out.

If the hull is designed so that the leeward through hull is unlikely to be below the water line when heeled, the drains don't cross.
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The reason that cocpit drains get crossed is that when the boat is heeled, the leeward drain through hull is likely below water. The water draining out of the scupper will have to push the water through an already flooded hose. If the drains cross, the leeward scupper can drain out the through hull into clear air, a much faster way out.

If the hull is designed so that the leeward through hull is unlikely to be below the water line when heeled, the drains don't cross.
I understand your first 2 sentences, but not the third.. You're saying that the leeward scupper would drain out the high-side through-hull?

That would be the first time I've heard anyone say water flows uphill..
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