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Catalina/Capri 25/250 Sailor's Forums

Catalina 250 Specific Forum

Removing ST40 speed transducer

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kevinmac
Admiral

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USA
732 Posts

Initially Posted - 06/05/2006 : 21:47:56

The post about the cranky ST40 reminded me I wanted to ask this question. I am sure it has been asked before, but I am not searching on the right words.

I understand that before I take my C250WK out of the water (onto my trailer) I need to remove the speed transducer. The procedure is, I guess, to unscrew the retaining ring and pull the tranducer, then quickly (!) insert the plug. Yikes! How much water comes into the boat when you do this? So much for my nice dry bilge... If there is seaweed or something in the tranducer, can you end up not being able to get it out, or the plug in?

Sign me, Nervous...

Kevin Mackenzie
Former Association Secretary and Commodore
"Dogs Allowed"
'06 C250WK #881
and
"Jasmine"
'01 Maine Cat 30 #34

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 06/05/2006 : 22:13:08

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by kevinmac
 ...I understand that before I take my C250WK out of the water (onto my trailer) I need to remove the speed transducer. The procedure is, I guess, to unscrew the retaining ring and pull the tranducer, then quickly (!) insert the plug. Yikes! How much water comes into the boat when you do this?<hr height="1" noshade id="quote"></blockquote id="quote">

Kevin,

If you're fast, you might get a couple of tablespoons of water on the inside. If you're are rather slow about it, you might get a half a pint. I too was a little apprehensive the first time I removed my transducer while in the water, but soon realized it's somewhat of a non-event. I put a sponge on the downhill side of the transducer to catch any water then simply wipe up any additional spillage.

As for seaweed getting caught on the transducer, I've never seen or heard of this happening so I wouldn't worry about it.

Edited by - dlucier on 06/05/2006 22:15:37

britinusa
Web Editor

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USA
5404 Posts

Response Posted - 06/05/2006 : 22:17:09

Kevin,
have to ask... why are you going to remove it?

We have the 250WB, and have never removed the transducer, we have launched about 14 times in the past year

(Our boat ... Joint Decision ... is 1 year old today!

Paul

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 06/05/2006 : 22:35:33

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by britinusa
 Kevin,
have to ask... why are you going to remove it?

We have the 250WB, and have never removed the transducer, we have launched about 14 times in the past year<hr height="1" noshade id="quote"></blockquote id="quote">

Transducers should be pulled periodically for cleaning and lube. They should also be pulled before trailering or before being lifted by a straps so the paddlewheel is not damaged.

Oh, and tell Joint Decision "Happy Birthday"!

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kevinmac
Admiral

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USA
732 Posts

Response Posted - 06/05/2006 : 23:03:57

Man, that is weird, just a tiny bit of water? It is a huge hole... Oh well, I'll give it a shot...

Thanks for your help everyone.

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britinusa
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USA
5404 Posts

Response Posted - 06/06/2006 : 07:49:33

<blockquote id="quote">quote:<hr height="1" noshade id="quote">They should also be pulled before trailering or before being lifted by a straps so the paddlewheel is not damaged.<hr height="1" noshade id="quote"></blockquote id="quote">

I can see the point: The paddle wheel could be damaged by the trailer bunks while retrieving from the water.
Our transducers are almost amidships fwd of the swing keel and the way the trailer sits in the water when retrieving there is just about no way that the trailer bunks could get anywhere near that area of the hull. (The rear end of the trailer bunks stick up quite a bit and act as a centering guide for the bow.)

So I don't see the transducers being in any danger during launch or retrieval to the trailer.

Of course, others may experience different situations. Not sure if our trailer is any 'special' design.

The only issue we have had is at really steep ramps: Then the back of the trailer is so low that the keel does not engage the back end of the trailer keel guides. In those circumstances, it is necessary to carefully manage the alignment of the boat onto the trailer.

Paul

Edited by - britinusa on 06/06/2006 07:52:20

RedRedWhine
Navigator

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USA
167 Posts

Response Posted - 06/06/2006 : 09:32:27

Kevin,

I just bought my boat and the old owner pulled the transducer out after every sail. The boat is in a slip in fresh water. He just put a towel around it and only got a little water in the boat. This kept the transducer clean and working great. Hope it helps.

Don and Kim
Red Red Whine

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