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Catalina/Capri 25/250 Sailor's Forums

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To / thru hulls

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gerdo
Navigator

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107 Posts

Initially Posted - 06/04/2002 : 12:52:40

New to boating but enjoying recent purchase of 1982 SK std rig 25. Did join association and happy to be on board. Now to the question.

After reading all I can on to /thru hulls I come back to a very basic and maybe dumb question. Why do the thru hulls have to be below the waterline? They only drain two sinks whose bottoms are above the water line. Could you not put the thru hull in above the water line? Other boats have that set up. In either case you close the cocks when sailing. Am I missing something here?

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 06/04/2002 : 14:31:21

Nope, you're not missing a thing! I'm sure it's just cosmetic--for people who don't want to see baked beans and ketchup running down the side of their boat (looking like something else). <img src=icon_smile_shock.gif border=0 align=middle>

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette "Passage" in SW CT

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John Mason
Admiral

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USA
687 Posts

Response Posted - 06/04/2002 : 16:26:20

On my boat, the forward to-hull is also the intake for flushing the head, so that one needs to be below the waterline.

John Mason - Ali Paroosa
1982 - FK/SR #3290

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 06/04/2002 : 19:02:52

"...for people who don't want to see baked beans and ketchup running down the side of their boat..."

That reminds me of a story,...

When I was in the navy, we were on a Carribean minicruise off the Cayman islands and the Captain announced a swim call. The ship was stopped, the launch with armed shark spotters was lowered into the water, and the Jacob's ladder was rigged on the starboard side fantail. It was a perfect day, warm temperature, light tropical breeze, not a cloud in sight. The water was a clear, inviting deep blue. About 30 of us took the plunge and were enjoying life as we splashed about. After about five minutes of recreation, we were alerted to a thunderous whoosh. Nearly 30 feet from us and a few feet above the water, towards the bow was an overboard discharge outlet(thru hull) probably 8 inches in diameter that was sending out a stream of stuff akin to a firehouse on full. This outlet was from the CHT system or in layman's terms, the sewer piper. Apparently, the holding tanks had become full and the automatic discharge turned on sending this effluent overboard. Needless to say, we all acted as if sharks were circling us as the chunky brown cloud started to spread ever closer to our swimming area. We raced to the Jacob's ladder to escape the ooze and at that point it was every man for himself as people were trying to escape this dreaded menace. After we got back on the fantail we all shared a laugh and asked the shark spotter's in the launch if they saw anything worth shooting. Ah, those were the days.

Don Lucier, Northstar
C25 SR/FK

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Tray
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Namibia
224 Posts

Response Posted - 06/04/2002 : 20:01:50

Don,

Those days are still here for some of us...

I don't know how a skimmer's sanitaries work, but on subs we "blow" our sanitaries overboard. The tank has to pressurized above sea pressure to work. During the discharge the heads are secured, but there was always one guy, probably still half asleep, who would use the "s**tter" then pull the flush handle releasing all of the pressurized waste inboard. The ensuing explosion may only last a nanosecond, but the results are truly spectacular. Anybody unfortunate enough to be in the head during the event would be coated in the stuff. It made me laugh everytime despite the stench.

I'm looking forward to getting back to sea duty.<img src=icon_smile_wink.gif border=0 align=middle>

Tray
C-250WB #554
"Weeny Bean"
<img src="http://members.sailnet.com/profile/uploads/weenybean/2002_0602AT.JPG" border=0>

Edited by - Tray on 06/04/2002 20:02:23

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 06/05/2002 : 00:58:06

Tray,

Is that where the phrase, "thar she's blows" originated? <img src=icon_smile_shock.gif border=0 align=middle>

Don Lucier, Northstar
C25 SR/FK

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Tray
Navigator

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Namibia
224 Posts

Response Posted - 06/05/2002 : 16:54:42

Possibly in the sense that any marine mammal nearby when the tank is blown overboard would probably head for the surface...quickly.

Tray
C-250WB #554
"Weeny Bean"
<img src="http://members.sailnet.com/profile/uploads/weenybean/2002_0602AT.JPG" border=0>

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 06/05/2002 : 20:47:24

Hey, hey, hey..... All I said was "baked beans"--how'd we get to all this?? <img src=icon_smile_big.gif border=0 align=middle>

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette "Passage" in SW CT

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gerdo
Navigator

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107 Posts

Response Posted - 06/06/2002 : 12:23:02

This site provides both technical and spiritual guidance. Thanks for all your responses. I think I am going to throw the sinks overboard.

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Tray
Navigator

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Namibia
224 Posts

Response Posted - 06/06/2002 : 17:24:20

Don't mention it, shipmate<img src=icon_smile_wink.gif border=0 align=middle>

Tray
C-250WB #554
"Weeny Bean"
<img src="http://members.sailnet.com/profile/uploads/weenybean/2002_0602AT.JPG" border=0>

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.