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Old 17-07-2015, 21:16   #1
Jd1
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Paddle wheel speed transducer is driving me nuts

Is there anything available that is reasonably accurate for speed through water (let's say +/- 0.1 knot) that doesn't mind a bit of marine slime and is compartible with a Raymarine Tridata ST60+ display ?
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Old 17-07-2015, 21:21   #2
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Re: Paddle wheel speed transducer is driving me nuts

No (AFAIK).
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Old 17-07-2015, 21:22   #3
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Re: Paddle wheel speed transducer is driving me nuts

There are high end doppler units but you will need a need display
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Old 17-07-2015, 21:25   #4
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Re: Paddle wheel speed transducer is driving me nuts

It doesn't seem to take much to stop the Airmar speed transducer Raymarine use.


I have an Echopilot FLS with speed, and that paddlewheel keeps going pretty much all the time. It's a simpler, much broader paddlewheel.


Don't know if it would be compatible with seatalk though.


There are versions of Echopilot FLS's that transmit NMEA sentences, but that would be a very expensive way of doing it.
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Old 17-07-2015, 21:41   #5
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Re: Paddle wheel speed transducer is driving me nuts

Why bother. Gps is the answer
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Old 17-07-2015, 21:49   #6
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Re: Paddle wheel speed transducer is driving me nuts

GPS doesnt solve the the OP's problem. He wants STW not SOG.
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Old 17-07-2015, 23:16   #7
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Re: Paddle wheel speed transducer is driving me nuts

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Originally Posted by motion30 View Post
Why bother. Gps is the answer
+1, yachts are complex enough without adding more troublesome underwater parts.. I can normally get a good enough feel for boatspeed by eye, and current from the shape of the waves.

Sent from my HTC_0PCV2 using Cruisers Sailing Forum mobile app
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Old 18-07-2015, 00:15   #8
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Re: Paddle wheel speed transducer is driving me nuts

Have sailed many thousands of miles, some passages 20 days or longer, with paddle wheel transducers for the knot meter/log without any problems. Take the paddle wheel out when you aren't sailing. Only takes a minute and no fouling build up. Yeah, it's been a pain to clean the bugger if I forget to pull it and it sits in the water for awhile. Reinforces the need to pull the thing.
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Old 18-07-2015, 02:03   #9
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Re: Paddle wheel speed transducer is driving me nuts

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Originally Posted by 44'cruisingcat View Post
It doesn't seem to take much to stop the Airmar speed transducer Raymarine use.


I have an Echopilot FLS with speed, and that paddlewheel keeps going pretty much all the time. It's a simpler, much broader paddlewheel.


Don't know if it would be compatible with seatalk though.
Thanks ! I was no aware that the Airmar teansducer is known for easy stopping. I kinda lumped them all into one and declared paddlewheels as a group to be crap.
I will look into an Echopilot FLS.

For those people suggesting that STW is not required, please note that I did not ask if STW is required or not (rest of rant deleted after re-reading).
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Old 18-07-2015, 02:05   #10
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Re: Paddle wheel speed transducer is driving me nuts

How accurate is an ultrasonic transducer at low boat speed? How tolerant is it of slime buildup ?
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Old 18-07-2015, 08:45   #11
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Re: Paddle wheel speed transducer is driving me nuts

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Originally Posted by roverhi View Post
Have sailed many thousands of miles, some passages 20 days or longer, with paddle wheel transducers for the knot meter/log without any problems. Take the paddle wheel out when you aren't sailing. Only takes a minute and no fouling build up. Yeah, it's been a pain to clean the bugger if I forget to pull it and it sits in the water for awhile. Reinforces the need to pull the thing.
I agree, take the wheel out when you leave the boat for any length of time and you save a heap of hassle. We get a lot of calcareous tubules building up here so we clean our transducer/wheel in vinegar before we put it back in at the start of a trip. Haven't had a problem with the log wheel since.

In the warmer months it's even a good excuse for a swim as it doesn't take much to dive under and quickly clean the paddles of any gunk
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Old 18-07-2015, 09:15   #12
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Re: Paddle wheel speed transducer is driving me nuts

I believe the maker of my log meter is Eagle Claw. It is a manual knotmeter for trolling up to 5 knots. It is also referred to as a taffrail log.
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Old 18-07-2015, 09:40   #13
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Re: Paddle wheel speed transducer is driving me nuts

If your speed over water is not known, your true and apparent wind speed will always be the same on the ST60 Wind dial.
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Old 18-07-2015, 09:42   #14
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Re: Paddle wheel speed transducer is driving me nuts

I have always found that a light coating og ablative antifouling paint works, otherwise take it out when not in use and get praciced at whipping it out for a quck clean and replace under way. I leave an old toothbrush in the bilge ready for the clean. Best to slow down for the removal to keep water inrush to a minimum before the blanking plug goes in

BTW we now have all new Garmin instruments and they too have an Airmar paddlewheel.
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Old 18-07-2015, 12:32   #15
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Re: Paddle wheel speed transducer is driving me nuts

I've been through 2 of them, they get crud in them and fail. I got a reconditioned Garmin unit for $200, now I have moving map and ground speed and it works!
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