is there a non impeller speed-log? - Page 2 - SailNet Community
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post #11 of 21 Old 01-17-2007
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OOPS! Speed=distance/time
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post #12 of 21 Old 01-17-2007
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OOPS! Speed = distance/time
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post #13 of 21 Old 01-17-2007
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Seafarer used to make one. It was originally installed on my boat before I bought it. I have just sent to one of our forum members both the Seafarer depth sounder and speedlog units.
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post #14 of 21 Old 01-18-2007
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I wonder if this could be a function of a more advanced depth finder? I haven't done the research but I bet there is something like that out there in the fish finder/ depth finder market. Of course it would be limited by the depth of the water... once the bottom is past it's max range...
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post #15 of 21 Old 01-18-2007
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Check out Airmar at www.airmar.com They have some speed sensors that uses ultrasonic (I think). Search for CS4500. It looks like Airmar made transducers (sensors) for use on many brands of instruments eg. Raymarine, Navman, Simrad etc....
Interestingly, just early this week, I ordered a replacement ST40 Speed transducer and found Airmar transducer in the Raymarine packaging. I called the dealer to verify and was told its indeed correct.

Last edited by trantor12020; 01-18-2007 at 07:33 AM.
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post #16 of 21 Old 01-18-2007
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What was the cost

of the Airmar Sensor that you got from Raymarine?
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post #17 of 21 Old 01-18-2007
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Quote:
Originally Posted by velero
of the Airmar Sensor that you got from Raymarine?
US$100 for the paddle wheel transducer. I think its too expensive. I already paid for a replacement Display unit earlier then found out that the transducer is also faulty. bummer.

Last edited by trantor12020; 01-18-2007 at 09:46 AM.
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post #18 of 21 Old 01-19-2007
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Other than dual transducer units for use in shallow water the only non-wheel log I know of is the pitot tube type. I know of none suitable for boat mounting, and they are all subject to damage due to their protuding beneath the hull.
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post #19 of 21 Old 01-20-2007
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I have a very old (late '80s) cathode ray tube depthfinder called a Marinetek Video Sounder.

I have NO CLUE how it works, but it involves a squared-off hull projection with a glass window (I dislike this on general principles...). However, it did work last season and did give a decent and fairly vivid idea of the bottom, but it sucked at depths over 40 feet, and eventually grew a coat of algae that meant it recorded all depths as 3.2 feet...I have to clean it this winter.

Did I mention that the Video Sounder (when scraped clean) gives a pretty accurate speed under way? Over about 1.5 knots, that is. I don't have an impeller thru-hull, just this old thing and a 1990s Raymarine chartplotter that tells me when I'm doing over 2 knots.
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post #20 of 21 Old 01-21-2007
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http://www.chicagomarineelectronics.com/nkeSensors.htm
Here's one place with a price list for the NKE electronics.

Last edited by seabreeze_97; 01-21-2007 at 01:33 AM.
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