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Go Back   SailNet Community > On Board > Boat Review and Purchase Forum > Sailboat Design and Construction
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  #11  
Old 02-26-2010
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bubb2 has a spectacular aura about bubb2 has a spectacular aura about bubb2 has a spectacular aura about
And to say they will not work. With 2 pieces of string and a 99 cent child's plastic protractor you can lay out crossed hoses and know they will work before you launch the boat.
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Old 02-26-2010
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It's a shame that most cockpit floors have a slope running towards the bow. It would be much simpler to have the drains flow out a big hole in the stern .
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Old 02-26-2010
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My cockpit drains are halfway between the transom and the bridgedeck, crossed below deck and are slower than I think they should be. I plan on a large drain through the transom on one side as I have an outboard rudder. The original drains will get any water left if heeled. My cockpit sole is 8" above the waterline at rest.
One reason I think for the forward drains is that for crossed hoses to work best you need them to be on a steep angle and not a shallow one. Most hulls will have more depth forward.
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Old 02-27-2010
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On our Tartan 27, there are two smallish cockpit drains that both empty to a starboard thru hull. The icebox on the port side (It's in a cockpit locker rather than in the galley, I found an electric space heater and a single burner stove in there) also also drains out the same thru hull.

I'm wondering why would this be set up that way? It would seem to me that if we are heeling to port, the water would go nowhere. I expected to look under the cockpit and see two thick gray pipes leading to thru hulls on opposite sides of the hull, not just one. The bend in the port hose there doesn't seem the best design to get water out. I could be wrong.



I've also read that enlarging the drains is a good idea; they do seem rather puny.
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Last edited by daydreamer92; 02-27-2010 at 01:57 AM. Reason: clarity, self-editing
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Old 02-27-2010
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No, the builder just did it as cheap as possible. If your cockpit fills you want each drain to have its own exit for maximum drainage.
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Old 02-27-2010
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Quote:
Originally Posted by jrd22 View Post
Umm... I guess most of the world's sailboat designers are wrong then? Mine seem to drain quite well when heeled over, must be something wrong

Mine were designed by McCurdy and Rhodes. So far they have been quite satisfactory.

Depends on where your outlets and drains are. My drains are on each side of the cockpit. The upper drain will not have any water against it when heeled unless cockpit is swamped. I have two differently configured boats. Since this is an "design" problem I mentioned them both as possibilities. However, as I mentioned, both systems are too small for serious off shore work.

Do NOT use automotive hose for below water line use unless you have the boat well insured. Use USCG below water line hose only. Available at marine stores or online.
The automotive under hood environment is much more severe than you will ever encounter in a drain. Automotive hoses are probably overkill unless they run through an oily bilge but many sizes and configurations are readily available. The reinforced neoprene "fuel" hose properly installed will withstand anything that you will find in a boat except the exaust.
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Old 02-27-2010
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I'm not going to argue about whether you should use automotive hoses below water line in your boat, just don't want anyone to believe it is approved or recommended or even a good idea when USCG approved hose is readily available. Your boat, your choice (you might want to check with your insurance agent about a loss caused by use of non-approved hose below waterline).
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Old 02-27-2010
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MEchsmith—

Glassing in a piece of PVC pipe is perfectly acceptable on many boats. Not all boats have a problem with flex.
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Quote:
Originally Posted by sailingdog View Post
MEchsmith—

Glassing in a piece of PVC pipe is perfectly acceptable on many boats. Not all boats have a problem with flex.
Dog, I don't mean to pick a bone with you. Could you please cite the ABYC standard that would allow for the use of ridged PVC. The reason I ask, I don't know a surveyor that would not fail a boat with glassed in ridged PVC.

Continuing with this question, could anyone cite a ABYC Standard that would allow the use of anything but USCG approved hose below the water line?
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  #20  
Old 02-27-2010
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jrd22, You have a lot more faith in the Gov't than I. A whole lot more.

bubb and dog, Everything flexes and it must be allowed for in your design. In a boat you may also have to deal with inspectors and insurance companies. However this is as much a political problem as an engineering one. Even in houses I have run across broken fittings and pipes simply because there was not sufficient room to allow them to move when necessary. For instance when a pipe goes from hot to cold over time it must move. If it can't something will break.

I would never join a hull to a cockpit with anything rigid. It will break sometime.
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