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Post by jpmaniac on May 21, 2020 9:27:06 GMT -5
Installed Raymarine Axiom 7RV this week with the RV-100 Transom Mount transducer. The install calls for "partial" mount of ducer, and adding the 3rd and final screw once it's adjusted properly. So here's a pic of my install. I get good readings when idling, and even a little faster, but once I'm on plane I get absolutely nothing. I've seen that some people have issues with side view on plane, but I just want to see bottom depth. Is this just something that happens on these boats (2002 216) with a transom mount? There is a Lowrance in hull from the old unit, any chance I can get that to work with the Axiom for depth while running? photos.app.goo.gl/vcP3ntp3UEJrKeKt9
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Post by fishnfool on May 21, 2020 10:40:51 GMT -5
Somewhat par for the course for a TM ducer. I moved mine down to near the center line of the boat and the bottom of the ducer hangs a tad below the hull and i usually can read depth at speeds between the teens and up to cruise of 30+ mph.
I also have a thru hull and that solves that problem 100% at any speed.
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Post by abouttime2fish on May 21, 2020 10:46:32 GMT -5
It can be a transom mount issue, but my first question is what frequency are you using on plane?? You mention side vue. If you are using side or down vue frequencies, they are not going to work on plane. I’m not familiar with your unit, but something like 83 kHz (common). Or if it’s a 50/200 kHz either let it auto select or pick appropriately for depth. 200 shallow, 50 deep.
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Post by abouttime2fish on May 21, 2020 10:52:42 GMT -5
Just looked up your transducer. Take it out of CHIRP and see what it does. I didn’t see actual frequencies for the Chirp, just ‘high’. Also didn’t see a max depth for it but did for the side/down/3D features and traditional. So I’m thinking it uses Chirp with the imaging which will be crazy high freq’s that won’t work on plane.
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Post by fishnfool on May 21, 2020 10:58:22 GMT -5
I would have mounted it lower and below the strake, between the strake and your motor. it might be tough to maintain bottom while on plane with the ducer where it is.
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Post by abouttime2fish on May 21, 2020 11:01:29 GMT -5
I would have mounted it lower and below the strake, between the strake and your motor. it might be tough to maintain bottom while on plane with the ducer where it is. I think further left in your picture is what he means, yes?
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Post by jpmaniac on May 21, 2020 11:18:50 GMT -5
I would have mounted it lower and below the strake, between the strake and your motor. it might be tough to maintain bottom while on plane with the ducer where it is. I think further left in your picture is what he means, yes? Yea, I guess I was nervous about being that much closer to the prop... I wasn't trying to use side view, just see "depth" measurement. I'm wondering if I should try taking it out of chirp mode before moving it...
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Post by fishnfool on May 21, 2020 11:39:53 GMT -5
Sure why not?
Personally i always leave my TM ducer in Chirp mode and generally don't have a problem with maintaing bottom at speed, but again, my ducer is mounted pretty close to the keel.
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Post by abouttime2fish on May 21, 2020 12:02:58 GMT -5
Sure why not? Personally i always leave my TM ducer in Chirp mode and generally don't have a problem with maintaing bottom at speed, but again, my ducer is mounted pretty close to the keel. I’m just not sure that RV100 chirp is really meant for depth reading. It looks to me like it was optimized for all the cool imaging it can do. But that is based on a 30 sec read of a product description. So yes, I would try it with chirp off before you move it. Even if it works you may decide to move it..... my first thought looking at your pic was that it’s really close to your bunk. Having crushed a ducer on the bunk before....it was actually mounted further outboard than yours, but I’ve got twins. That ducer was a P-66 50/200 kHz and did hold bottom on plane, though not at WOT.
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Post by jpmaniac on Jun 1, 2020 12:35:55 GMT -5
Well, I moved it to the red area, it hangs below the hull, and it reads at more speed, but not on plane and now I have a weird rooster tail Guess I shouldn't have messed with it Attachment Deleted
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Post by chesapeake173 on Jun 1, 2020 18:59:49 GMT -5
Tilt it so the rear of the ducer is lower than the front. It seems counterintuitive, but it reduces the turbulence under the ducer which causes problems.
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Post by jpmaniac on Jun 2, 2020 9:03:52 GMT -5
Tilt it so the rear of the ducer is lower than the front. It seems counterintuitive, but it reduces the turbulence under the ducer which causes problems. I'll give this a shot and report back
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Post by abouttime2fish on Jun 2, 2020 15:12:51 GMT -5
You happen to try it out of chirp?
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Post by jpmaniac on Jun 2, 2020 22:10:03 GMT -5
You happen to try it out of chirp? I couldn't figure out how to do that on the axiom.... So used to Garmin. I think I'm going to put her in the water Thursday morning to try and get everything figured out
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Post by jpmaniac on Jun 3, 2020 13:49:08 GMT -5
Still couldn't pull it out of chirp... but, I did pickup bottom in the low 30s with it slightly forward, that's a win! But now... I think it's too damn low with the rooster tail it's throwing. I think I'm gonna go ahead and grab a sternsaver so I can stop the holes in the transom!
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