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Forums, Electrical Systems, Navigation and Safety equipment, Speed/Log Transducer

CO32BB : CO32BB

00:45 16 October 2023

Speed/Log Transducer

George Isted at 28/04/2015 15:50:34
I, like many, have a single log transducer that is located under the floor of the heads compartment on the port side of the hull. This gives a faster reading on one tack than the other making the data unreliable for working out polars and general performance monitoring.

What have others done to fix this?

I think there is a way to have two transducers (one each side) such that is only reads the correct one – or perhaps it takes an average?

Alternatively there appears to be a combined speed and depth transducer that I could use to replace the existing depth transducer on the centreline of the boat.

Can anyone give advice as there is nothing useful about this online.

I walked past the very tricked-up Contessa 26 “Miao” at the weekend and I note that she has a Log transducer on each side of the hull.

Thanks

CO32BB : CO32BB

00:45 16 October 2023

Speed/Log Transducer

Richard Ritchie at 28/04/2015 16:13:29
I have the same problem: Raymarine ST60 definitely reads faster on one tack, by about 1 knot when beating…
Sadly no solution proposed.

CO32BB : CO32BB

00:45 16 October 2023

Speed/Log Transducer

George Isted at 28/04/2015 16:19:36
Raymarine support have just emailed me back (surprisingly quickly) suggesting that I can fit a second transducer and a second wireless hull transmitter and it will work out which hull transmitter to use based on the wind data – I guess is works out what the leeward (deeper) transducer is and uses that.

That sounds pretty clever, if expensive, fix to this.

BOAT – Break Out Another Thousand

CO32BB : CO32BB

00:45 16 October 2023

Speed/Log Transducer

George Isted at 29/04/2015 16:01:45
Just to follow up, following a suggestion from Kit Rogers, a discussion with Raymarine and check with a dealer I have just ordered a T910 Depth/Speed/Temp transducer that will replace the existing Depth/Temp transducer that is in the normal centreline position in front of the keel. This “should” help significantly with the off-centre log issue.

The skin fitting for the old and new transducer is the same so it “should” just be a case of swapping them over.

The downside is I don’t yet know what the effect of having the Log on the leading edge of the hull will be.

CO32BB : CO32BB

00:45 16 October 2023

Speed/Log Transducer

Richard Ritchie at 29/04/2015 16:57:51
Ah.. My depth sensor is under bunk cushion just in front of galley, so not a solution for me!
I hope it works for you.

CO32BB : CO32BB

00:45 16 October 2023

Speed/Log Transducer

Richard Ritchie at 18/06/2015 14:13:13
Speaking of Polars: does anyone have an official polar diagram for the Contessa 32??

CO32BB : CO32BB

00:45 16 October 2023

Speed/Log Transducer

George Isted at 18/06/2015 14:38:31
I’ll send you what I have Richard.

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