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LH rotation, which side to mount xducer?

Old 07-20-2013, 08:17 PM
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Default LH rotation, which side to mount xducer?

My friend just bought a 25' walkaround with a single 225 Merc. The motor came off another boat with twins and has left hand rotation. He purchased an elite 7 hdi Lowrance and I'm curious to know which side of the transom to mount the transducer to get the best results? I have always mounted TM transducers on the starboard side on all my boats, but they were standard RH rotation. Does it make a difference?
Old 07-20-2013, 09:24 PM
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Some will say it does, but I've never understood the reasoning. Water flow to the motor is the same unless it's mounted almost in the center. Of more importance is the location of hull protrusions in front of the transducer, like water intakes or strakes ... ;?
Old 07-21-2013, 05:33 AM
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Thanks for the response. There is unobstructed clean flow on either side. I figured it wouldn't make much difference which side, but the thought occurred to me about the rotation.
Old 07-21-2013, 08:13 AM
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This is what Airmar recommends:

Question from their FAQ :

"Can a transom-mount transducer be installed on either the starboard or port side of the boat?"

Airmar's answer:

"We recommend mounting a transom transducer on the starboard side of a single-drive boat. This is the side where the propeller blades are moving downward for minimal disturbance from the propeller. The transducer should be located a minimum of 75 mm (3") beyond the swing radius of the propeller."

http://faq.airmar.com/index.php?acti...board+mounitng


From my personnel experience many the larger outboards now have their prop's a considerable distance from the transom..and I really never see that much difference in performance because of that.
Old 07-21-2013, 09:51 AM
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It probably won't make a difference. Probably.

But if you mount it to the right of the motor and there is interference then you will be having to move it to the left of the motor. And then be left with unused screw holes in the boat.

If there is no reason not to, why not simply mount it to the left of the motor to minimize the possibility of any adverse results?
Old 07-21-2013, 01:40 PM
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I can tell ya' ,I went from a right rotation to a Counter on my Hydra-Sport....Made no difference with my Sonar readings.Still reads at 45 mph.
Old 07-21-2013, 01:46 PM
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This is the side where the propeller blades are moving downward for minimal disturbance from the propeller.

The prop is behind the transducer, why would there be interference forward, left or right side? Like I said, never understood ... ;?
Old 07-21-2013, 03:05 PM
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Originally Posted by Curmudgeon View Post
This is the side where the propeller blades are moving downward for minimal disturbance from the propeller.

The prop is behind the transducer, why would there be interference forward, left or right side? Like I said, never understood ... ;?
Keep in mind with a inboard engine the prop could be closer to the transom..and sometimes even forward a tad.
In that case there could be more of an issue.

So I think the Airmar caution was to be a more general covering of all bases etc.
Old 07-21-2013, 05:58 PM
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Thanks for the information everybody.
Old 07-21-2013, 09:10 PM
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So I think the Airmar caution was to be a more general covering of all bases etc.

That I can understand ...

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