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Catalina/Capri 25/250 Sailor's Forums

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really dumb question

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quilombo
Captain

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USA
301 Posts

Initially Posted - 05/21/2008 : 07:29:10

I know this is really dumb, but has anyone ever pulled out one of those transducers that go through the hull that sit in those holders real fast while in the water,,,?? I just realized that right after I launched my boat, the transducer is not working and have a good working one that fits into the holder,
how much water will rush in , it seems pretty easy,,,lol but figured Id ask a really stupid question anyway,
I was thinking of swapping it over pretty fast,,
what do you guys think

Edited by - on

Even Chance
Captain

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USA
393 Posts

Response Posted - 05/21/2008 : 07:32:45

Don't do it. It's not a matter of sticking things back in "pretty fast." You need to seal it. It might not fit. It might take longer than you think. It's a quick route to a sunken boat.

Edited by - on

quilombo
Captain

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USA
301 Posts

Response Posted - 05/21/2008 : 07:34:46

ok, I guess I just wanted to hear that,,
I knew that answer before I asked it,,,,,
it just looks sooooo easy,, I didnt want to go for the additonal 100 bucks to haul her out,, but I guess Ill do it,,

Edited by - on

dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 05/21/2008 : 07:35:36

Yeah, I pull my transducer and I agree, that first time made me a little nervous too, thinking that water is going to come shootng up like a geyser, but it is rather a non-event. There is really no pressure and some water will come in, but it's like a garden hose that has the spigot just slightly open. If you're quick and pull the transducer and put in the plug (or the other way around) you might get a cup of water on the inside. Just keep a sponge handy to soak up what comes in.

Edited by - on

quilombo
Captain

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USA
301 Posts

Response Posted - 05/21/2008 : 07:40:30

is that right?? I was under the impression it would shoot up etc like a broken pipe in your house,, but now that I think of it, why would it,,,
Im still nervous,,lol,
thanks

Edited by - on

DaveR
Master Marine Consultant

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USA
2015 Posts

Response Posted - 05/21/2008 : 07:41:38

Seriously Don? It'd scare the hell out of me! I'd just get the "shoot through the hull" transducer and use the ole toilet seal wax method.

Edited by - on

quilombo
Captain

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USA
301 Posts

Response Posted - 05/21/2008 : 07:43:57

you konw I was gonna do that with the wax, but do those types of transducers work that way to, or do I have to get a specific type, I tryed it yesterday and I think I lost some of the signal going through the fiberglass, I was holding it in the water and it seemed clearer

Oh Oh I see a hot topic on the way,,,,,,,,,,,,,,,,,,,,,,,,

Edited by - quilombo on 05/21/2008 07:45:06

Justin
Admiral

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502 Posts

Response Posted - 05/21/2008 : 08:26:27

Don't Panic!

You won't sink. It is very easy to swap out. I do it all the time, often each weekend. I take out the knot meter and insert the plug just to keep growth off the paddle wheel. A cup or two of water comes in, but it's easy to sponge out.

Edited by - on

redeye
Master Marine Consultant

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3477 Posts

Response Posted - 05/21/2008 : 08:44:36

I opened up mine the other day to inspect it and the water comes in but not too bad. It is kinda scary though, cause you just think if you strip that thread right now, or it does not seal well I'd be in REAL trouble.

What would you use as a gasket material for this seal?

It made me realize I MUST order wooden plugs to keep onboard...

Edited by - on

Bruce Baker
Captain

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USA
402 Posts

Response Posted - 05/21/2008 : 08:50:43

I put a new paddlewheel on my speedo while the boat was in the water. I pulled out the old paddlewheel and put in a plug--then pulled out the plug and put in the new paddlewheel. Overall, I got a half gallon of water in the boat. It came in alarmingly fast, but even two semi-clumsy operations yielded only a small amount of water.

Edited by - on

Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 05/21/2008 : 08:58:58

What Ray is talking about is conical wooden plugs that you can buy in most chandleries. It's a good idea to have them regardless--if any thru-hull (or an infamous Catalina "to-hull") gives way, you have something to jam into the hole. I'd get some before I created that scene on purpose. (BTW, the pressure isn't enough to throw the water as high as the boat's waterline, which isn't very high.)

Edited by - Dave Bristle on 05/21/2008 10:49:36

Even Chance
Captain

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USA
393 Posts

Response Posted - 05/21/2008 : 10:41:24

You guys are braver than I. So, I'll revise my advice -- I've never done it, and wouldn't. I'd have the boat in the slings, or at least careened at low tide.

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 05/21/2008 : 10:48:02

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dave Bristle
 What Ray is talking about is conical wooden plugs that you can buy in most chandleries. It's a good idea to have them regardless--if any thru-hull (or an infamous Catalina "to-hull"), you have something to jam into the hole. I'd get some before I created that scene on purpose. (BTW, the pressure isn't enough to throw the water as high as the boat's waterline, which isn't very high.)
<hr height="1" noshade id="quote"></blockquote id="quote">
Bung is the magic word, bung plug.

Edited by - on

Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 05/21/2008 : 10:50:43

Ya gotta live a little, Brooke!

Edited by - on

JimB517
Past Commodore

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USA
3285 Posts

Response Posted - 05/21/2008 : 11:34:48

I can pull my speed transducer out while sailing, put in the plug, clear it of kelp, pull out the plug, and put the transducer back in the hole.

Get a gallon or two in the keel well, no big deal.

Its a little frightening the first time. The stream of water is like a garden hose turned on halfway.

Cool to see the bottom of the ocean through a hole in your hull.

Edited by - on

dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 05/21/2008 : 11:37:21

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Even Chance
 You guys are braver than I. So, I'll revise my advice -- I've never done it, and wouldn't. I'd have the boat in the slings, or at least careened at low tide.
<hr height="1" noshade id="quote"></blockquote id="quote">

Brooke,

If I don't remove my paddlewheel transducer before my boat is in the slings, the slings may remove it for me. For this reason, my speed transducer and through hull are specifically designed (it has a spring loaded flap to minimize water ingress) for removal with the boat in the water.

Edited by - dlucier on 05/21/2008 11:38:34

stampeder
Master Marine Consultant

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1608 Posts

Response Posted - 05/21/2008 : 14:22:18

HMMMMMMMM....I had a thru hull fail and water came in very fast. It was like a garden hose on half throttle. It was the starboard thru-hull approx as far aft as the last window. Would the difference be the location, flat vs curved part of the hull?

Edited by - on

Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 05/21/2008 : 15:56:03

I have a Raymarine ST60 Bi-data, and it has a dummy plug insert for when either transducer is removed while the boat is in the water, no a generic wooden plug. It also has a spring loaded flap and only leaks a cup or so when changing. It is designed to allow pulling the transducer without hauling the boat. Shooting through the hull will cost you a little signal strength, but I found it satisfactory on my previous boat.

Edited by - on

piseas
Former Treasurer

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USA
2017 Posts

Response Posted - 05/21/2008 : 16:23:22

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Frank Hopper
 <blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dave Bristle
 What Ray is talking about is conical wooden plugs that you can buy in most chandleries. It's a good idea to have them regardless--if any thru-hull (or an infamous Catalina "to-hull"), you have something to jam into the hole. I'd get some before I created that scene on purpose. (BTW, the pressure isn't enough to throw the water as high as the boat's waterline, which isn't very high.)
<hr height="1" noshade id="quote"></blockquote id="quote">
Bung is the magic word, bung plug.
<hr height="1" noshade id="quote"></blockquote id="quote">
Frank, I did a little investigating and found this:Encarta Answers
bung:
- stopper: a stopper or plug, especially one made of cork or rubber
- payoff: an illicit fee paid to a football player, manager, or agent to facilitate a player transfer
- plug hole: to plug or seal a hole with a bung
- place carelessly: to put something somewhere roughly or hurriedly.
Two out of four fit. Good job.
Steve A

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 05/21/2008 : 17:05:30

Don't forget the bung mallet! This stuff has been used to plug casks for hundreds of years.

Edited by - on

frog0911
Master Marine Consultant

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USA
1349 Posts

Response Posted - 05/21/2008 : 18:00:19

Your comments about trying the other transducer over the side and then thru the hull gives me the impression your are talking about a depth transducer. I have never seen a depth ducer that could be replaced while in the water. The item being discussed is the speed ducer which can be pulled and a plug inserted. I do this after I sail which prevents the barnacles from attaching to the paddle wheel and making it useless since it will not spin. Do I understand correctly or were you talking about the speed ducer?

Edited by - on

John Russell
Master Marine Consultant

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USA
3444 Posts

Response Posted - 05/21/2008 : 22:17:54

I took mine out last summer to clean the paddlewheel. I had a plug replacement at hand. I pulled one with my left hand and inserted the plug with my right in pretty rapid succession and still had soaked beach towel that I surrounded the opening with. A 1 ¼" hole in the hull lets in a lot of water rather quickly. I'll betcha one of these engineers could actually calculate the amount over a spcified period of time with a given displacement. Sure hope they don't though.

Edited by - on

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