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Big rooster tail from ducer into the lower cowling. What to do?

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Big rooster tail from ducer into the lower cowling. What to do?

Old 07-13-2014, 04:24 PM
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Default Big rooster tail from ducer into the lower cowling. What to do?

Howdy......first time out today with the new GPS Map 50dv on a 22 degree hull. At cruising speed, 30mph, I saw a gusher coming straight up behind the transom and blasting the lower cowling.

I think it is mounted exactly where the directions call for. Operationally, it seemed flawless. I was able to hold both sonar and dv at 30mph. I doubt moving it up or down 1/4" will change it. So I guess I have to make a deflector!!!?

Kind of irritating. This is one of the reasons I really wanted to go with a thru-hull ducer, but they don't make one for this unit.

Any ideas?
Old 07-13-2014, 06:31 PM
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Simple, cheap, effective
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Old 07-13-2014, 06:42 PM
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Did you try a spacer between the hull and the mount? Take a pic to show how and where it is mounted. I had problems with the size of my TM 275 - moved it inward on the transom and solved the problem immediately....
Old 07-13-2014, 07:39 PM
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I will post a pic tomorrow. Thanks........
Old 07-13-2014, 08:32 PM
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First try closing off the open space in the bracket between the transducer and the hull. I had the same problem & it was water running thru the open space in the bracket between the 2 bracket arms & not the transducer itself. Just wrap electrical tape around the bracket closing off the open space & see if that solves the problem. If so, leave the tape on or fabricate something else to close it off. The tape has lasted on mine for 3 years so far.
Old 07-13-2014, 08:37 PM
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The bottom of the transducer is the important part. Looks too low to me, not surprised it's throwing water ... ;?
Old 07-13-2014, 09:24 PM
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Here is a link on this topic.- nice fix for the problem.

http://www.thehulltruth.com/boating-...er-engine.html
Old 07-13-2014, 10:06 PM
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Looks to low.
Old 07-14-2014, 05:46 AM
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Originally Posted by retired View Post
Here is a link on this topic.- nice fix for the problem.

http://www.thehulltruth.com/boating-...er-engine.html
Great idea. I'll try the black tape first. I'll post a pic later.
Old 07-14-2014, 03:08 PM
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Here is the setup. It might look low, but it's exactly as the directions called for. And I can see how the "hole" between the mounting bracket and the ducer itself would create an upward jet. I'll try taping it off first to see what happens. If the tape does it, that's good enough for me.
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Old 07-15-2014, 12:02 PM
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Yikes, that's a lot of screws. I would screw and seal one piece of HDPE or starboard to cover all those holes and allow you to change locations without adding anymore holes in your boat.
Old 09-12-2014, 02:37 PM
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Default Update.....

Originally Posted by SpeedDemon View Post
First try closing off the open space in the bracket between the transducer and the hull. I had the same problem & it was water running thru the open space in the bracket between the 2 bracket arms & not the transducer itself. Just wrap electrical tape around the bracket closing off the open space & see if that solves the problem. If so, leave the tape on or fabricate something else to close it off. The tape has lasted on mine for 3 years so far.
That did the trick! I hadn't been able to get on the water, so it wasn't until yesterday that I got to try my/your fix. Blocking off that channel with several wraps of tape did it. I secured the end of the tape with Plumbers Goop. I'll see how long this lasts.

Added benefit seems to be that the unit is holding bottom even during rapid transition from deep to shallow water. The unit worked very well yesterday. Pleased.....

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