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   S/S clam shell covers on 25' Revenge Hull

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Author Topic:   S/S clam shell covers on 25' Revenge Hull
Eagleman posted 08-05-2002 11:08 PM ET (US)   Profile for Eagleman   Send Email to Eagleman  
Do other 25' Hulls have those clam shell covers over the through hull fittings on the bottom of the hulls. On my Revenge I have them both port and starboard over the through hull fittings. The problems that I'm encountering is that I would like to place my trailer bunk next to the outside chime however if I attempt this the bunk would crush these clam shell's. I was considering removing both clam shell devices so that I can place my trailer further to the outside of the hull. I wouldn't think that the bunks would damage the thru hull fittings. As always would appreciate comments from the field.
Thanks again,
Morocco posted 08-06-2002 01:13 AM ET (US)     Profile for Morocco  Send Email to Morocco     
I think you would have problems operating without the clamshells -- they not only protect the thru-hull, but work sort of like a wing, the water going along the curve goes a longer way than water following the hull next to the clamshell. Like on the upper surface of the wing, this creates an area of lower pressure -- in this case it gets tranferred to the thru hull and results in 'suction' underway, removing the water. Remember, too, that the hull isn't flat, especially at the front, so the aft edge of the unprotected thru hull is LOWER than the front one, so it will 'scoop' water and push it UP the tube. At any speed, I think you might blow the plug loose (unless it were VERY tight) flood the boat.

I have seven thru hulls on my 25 -- all of them had clam shells except the aft center, which had corroded away -- that was where I got the most water from my hull when I replaced all of them with PVC, caulk, and epoxy 'collars' on the outside of the hull where the little rolled lip of the metal thru hull was. Then I put brand new Perko 2 inch clamshells in place, bedded with 5200.

If you leave them off, I'd be interested in the result.

jimp posted 08-06-2002 11:07 AM ET (US)     Profile for jimp  Send Email to jimp     
Eagleman -

I've got a 1990 Revenge 22 with 225 Johnson (Cetacea 44). I have a bunk trailer and the aft port & starboard drain clam shells sit on the bunk - no problem, I don't think the clam shell looks crushed or deformed. The bunk is not flush with the bottom, the high side rests along the hull for about 6-ft, the lower side is a 1-point contact on the clam shell. Not the best, but adequate. Its been like that since 1990. My trailer has 4 bunks, two either side of the keel, 2 inside the sponson.

The forward clam shell for the thru-hull to the cabin was a problem. Everytime I tried to launch, the clam shell would hang-up on the bunk. The bunk & carpet was getting chewed up. So I removed the forward clam shell. No problems either.


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