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pm265 pocket transducer install question

Old 12-01-2017, 07:41 AM
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Default pm265 pocket transducer install question

I have a PM265LH I am going to install to go with a BSM-2 into a Simrad network. The boat is a 31' Jupiter, which has a large flat pad on the centerline.

My question regards making sure I have good water flow over the transducer. My understanding is that the water flow right at the hull surface can have some turbulence causing reduced transducer performance. Will the performance be better if the transducer is installed a little below the pad level to be slightly deeper in the water column.

I could, without any trailer problem, mount it about 1/2" below the flat pad plane, and build out a little water break like the fairing blocks on the b265 (but far smaller profile). Is that likely to be worth the extra trouble?


I may be overthinking this, too, so feel free to say that.
Old 12-01-2017, 07:52 AM
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If you are referring to the boundary layer that is present on some of the larger hulls at speed.....then going an extra 1/2" may not really be a noticeable advantage.

Most fairings used to overcome the boundary layer effect are about 4" .



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Old 12-01-2017, 09:15 AM
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OK, thanks Gil. I will just mount it flush to the pad.
Old 12-01-2017, 09:31 AM
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Dead flush, my Seahunter (same type of pad as yours) has 2 B260's mounted this way, reads excellent at speed. Actually taking the boat to C&A on Monday, we're cutting both B260's out and pocket mounting a R509LM, now that'll be interesting!
Old 12-01-2017, 12:51 PM
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That's a serious hole in the boat. I'm nervous about the dinky one I need to make.
Old 12-01-2017, 08:43 PM
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Originally Posted by Texas 17 View Post
That's a serious hole in the boat. I'm nervous about the dinky one I need to make.
have you considered the in hull M265C-LH ?


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Old 12-02-2017, 05:43 AM
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Yes, but I got a great deal on the pm265 from a guy on here who never installed one he bought, and I’ve got a good spot for it with an old pocket mounted 258 that can get cut out. Plus, I like the idea of not losing the sensitivity of shooting through the hull.
Old 12-02-2017, 08:45 AM
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Deals are good!

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