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CM38 Cockpit scupper drain check valve

J

jeffm

New Member
Did they come with this stock? The exit for the drain scupper is right at the water line, so I could see water coming in with a following sea. Has anyone removed it, and if so was it OK?
 
You have probably figured out by now that there are few or no CM38 owners on the site. I have never heard of a check valve on a cockpit drain, but it might be a reasonable idea--IF it NEVER failed to open for the cockpit to drain. Many cockpit drains are actually under the water, with sea cocks to close them. The risk from a sea depends on how high above the water the cockpit sole sits, I should think. The boat has reserve buoyancy in the stern, in any case, and will rise with a sea. The real risk is getting pooped, in which case you want the water to discharge quickly. Near surface drains will do that better than deeper drains Morgan, who himself designed your vessel, knew his stuff.
 
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Hello Guys . I'm also a CM38 owner... yes the water might get there at times, rarely ... it splash a little,but drains quickly. No check valve on mine. It drains above the water line.
 
Interesting post, we have a 1984 384, we were out last weekend and I noticed water coming up through the cockpit drains at times, based on boat attitude and the waves/swells, and a rather irritating gurgling sound. The water probably arriving via the torpedo tube exits (but I have not looked at all the drainage plumbing to confirm). I was thinking about installing a couple of check valves near the exit of the torpedo tubes close to the hull (if I can get there easily, I can see them be have not looked close enough to see if I can "work on them".

Any thoughts? This situation is not a big deal, there was not a significant amount of water in the cockpit. Just an idea, thanks Greg
 
Just live with the gurgles. No effective way to install check valve in the torpedo tube. If you look at the two cockpit scuppers, (removing the top grate), you may find that the rubber flap has deteriorated. I replaced mine. New rubber will need to be slit in a cross to allow the rubber to open when there is water in the cockpit. It is there to reduce water squirting in, but in some conditions I still get bits of water, which, of course, drains immediately.
Lots on the site about torpedo tubes. Originally, they were PVC, to which most marine adhesives do not adhere. Mine began leaking at the hull joint. I had the tube replaced with a fiberglass tube. Very tough glass job, because of the cramped access. $7K later, my tube is solid as a rock.

I can't remember if Warren Holybee had to plug his for the Pacific Cup. The issue, I guess, is that many boat drains exit in the tube. If the boat started sinking, back pressure could force water back into the boat (shower sump and manual bilge pump). Deck drains also go there, but that is not an issue, I guess.

As I have thought about it, I think the cockpit should have two more scuppers to assure quick draining. I have not done that job yet.
 
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