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Catalina/Capri 25/250 Sailor's Forums

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Transducers revisited

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josh-hansen
1st Mate

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USA
50 Posts

Initially Posted - 06/14/2007 : 14:03:08

I have been a little delayed in my launch this year and there is one major thing left to do. I have gone through all the posts regarding transducers and still have some questions. I am looking at getting the Raymarine ST40 Bidata and can't decide which transducer/speed mounting option to get. I am aware of the issues with a transom mount and they don't offer an in-hull option since it also needs to gauge speed.

My questions are: How hard will it be to replace the stock transducer and speed (paddle wheel thingy) on my 82 SR FK? Will the newer parts fit into the old holes? Has anyone else installed the ST40, and how do you like it?

Thanks for the help!

Josh Hansen

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Nautiduck
Master Marine Consultant

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USA
3704 Posts

Response Posted - 06/14/2007 : 14:29:54

I just replaced my ST30 Bidata with the ST40. It was not hard and we love the new unit. The two through-hulls are located in front of the keel (we are WK) a few inches in front of the fresh water tank. They are side by side, each mounted about 4"-5" from the centerline. I can take a photo if that helps.

The holes for the new transducers were a 1/4" larger than the old ones. How I handled that was to use two hole saws mounted on the bit at the same time. One, the size of the old hole, kept the drill straight and true while the larger one cut the new hole. In other words I nested the smaller hole saw in the larger one and mounted them on the same spindle thing. The nesting makes the smaller one stick out just a bit further than the larger one and to act as a guide. It worked like a champ.

Edited by - Nautiduck on 06/14/2007 14:31:21

britinusa
Web Editor

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USA
5404 Posts

Response Posted - 06/14/2007 : 16:05:20

Randy, what did you pay for your ST40 package?

Paul

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Nautiduck
Master Marine Consultant

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USA
3704 Posts

Response Posted - 06/14/2007 : 17:45:01

$310 at WM.

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Leon Sisson
Master Marine Consultant

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USA
1893 Posts

Response Posted - 06/16/2007 : 19:34:57

Clever technique on the stacked hole saws!

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atgep
Master Marine Consultant

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1009 Posts

Response Posted - 06/17/2007 : 00:37:32

Last year, I swapped to a gps chartplotter fishfinder combo and love it. I have moving charts, water temp, awesome fishfinder/sounder. It also came with a waterspeed sender. That is handy to tell true boatspeed. This all set me back around $500. The depth trasducer is stuck to the inside of the hull with bowl wax. My old sounder is still in the boat to cover the big hole in the bulkhead.

I think the chart-plotter-sounder combos are hard to beat for our boats. And no need to put more holes in the boat!

Tom.

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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.