Author Topic: OK to use SI transducer for depth readings at speed?  (Read 176 times)

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Offline Slinger

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OK to use SI transducer for depth readings at speed?
« on: March 18, 2021, 05:03:36 PM »
I'm getting ready to install an XM 9 HW MSI T transducer on my boat, and I'm thinking of putting it down at the bottom of the transom so it skims the water at high speed.  That would allow me to avoid installing an in-hull transducer for depth readings at speed.  I know that increases the risk of the transducer getting damaged from striking objects.  Aside from that, is there any other reason not to do this?  Are these big SI transducers meant to be able to skim the water and give depth readings at 50 mph?

Another question I have is about distance from the prop.  The manual says it should be at least 15" to the side of the prop.  My boat has a stepped hull, and the easiest mounting location for the transducer might be in front of the prop, where it would still be more than 15" away.  Would that work, or does it really need to be off to the side?



Offline rnvinc

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Re: OK to use SI transducer for depth readings at speed?
« Reply #1 on: March 18, 2021, 10:08:19 PM »
Some are able to get high speed depth readings with the included SI xducer  ... the challenge is created because that “bricked shaped” xducer is not very hydro dynamic  ...

Installing a mounting board can allow adjusting the xducer without drilling more holes in your hull  ...
——

The 15” minimum distance from the prop is more for an outdrive that has the prop forward of the transom  ...

Just do not install the xducer in front of the water intakes on your lower unit to where cavitation (aerated water created by that brick shaped xducer plowing thru the water) can get to the outboard water pump  ...

Rickie
« Last Edit: March 18, 2021, 10:10:27 PM by rnvinc »

Offline fishreed

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Re: OK to use SI transducer for depth readings at speed?
« Reply #2 on: March 25, 2021, 12:26:27 AM »
I'm getting ready to install an XM 9 HW MSI T transducer on my boat, and I'm thinking of putting it down at the bottom of the transom so it skims the water at high speed.  That would allow me to avoid installing an in-hull transducer for depth readings at speed.  I know that increases the risk of the transducer getting damaged from striking objects.  Aside from that, is there any other reason not to do this?  Are these big SI transducers meant to be able to skim the water and give depth readings at 50 mph?

Another question I have is about distance from the prop.  The manual says it should be at least 15" to the side of the prop.  My boat has a stepped hull, and the easiest mounting location for the transducer might be in front of the prop, where it would still be more than 15" away.  Would that work, or does it really need to be off to the side?

What you are trying to do WILL NOT WORK. Get a second transducer and a dual transducer cord made for higher speeds and stop trying to re-invent the wheel. Your SI transducer was never designed to get high speed readings.


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