Transducer Spray on Flats Boat

WildLinesWildLines Posts: 547 Officer
Under this current setup, 2 guys in the boat running we don't get any spray from the transducer. Throw in a third or fill the rear livewell and the transducer starts putting off enough spray to get everyone on the rear seat wet with a spray. Makes me think it is to low in the water. It currently reads pretty good, but will loose reading bottom at high speeds. Here is a couple pics of the placement, I have it positioned outside of a high speed pickup.

I don't want to go through the headache of moving it anymore than I have to, so I thought I wold post and get some feed back on what to do.

The boat is a 2010 1890 Action Craft with a 200 HPDI.



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Replies

  • fishknutfishknut Posts: 3,925 Officer
    Time to go with a through hull.....
    Fail to plan, plan to fail.......
  • rehartlinerehartline Posts: 721 Officer
    I've been chasing a similar problem on my boat (different from yours). I slid it up vertically as far as the mount would let it go in the existing holes and got a significant improvement. I'm thinking about getting a Sternmate mount http://sternmate.com and playing with it. According to the results I've seen with my boat your photos look like it could be to low.
  • BoattronicsBoattronics Posts: 5,071 Admiral
    Your position is good, as far as placement is concerned. I would have tried to get it further away from inline with the pickup, thats why you loose it at speed. As far as the spray, you can rig up a piece of plastic, a flap if you will, using the exsisting screw holes or the holes in the bracket if your a bit crafty. A heat gun will help bend the plastic to the desired shape. I like to put the ducers lower, that is, closer to the bottom of the v, so the ducer is in denser, less turbulent water and to avoid this problem you speak of.
    Tony Eden-
    Certified, licsensed and insured, Marine Electronics and rigging master, and "Dream boat" build winner with 20 years of professional experience.
    Boattronics.net
    Over 80 seperate, recent reviews from captains on this forum-
    http://forums.floridasportsman.com/showthread.php?5295-Recent-Boattronics-reviews!
    Please call with any questions or a free estimate for the lowest price/best work available!
    904-545-1270
  • MikeSJCMikeSJC Posts: 20 Greenhorn
    I agree with "fishknut" with a thru hull transducer. Works great for me!
    Mike
  • c_captnc_captn Posts: 3 Greenhorn
    A transducer should be in direct unobstructed contact with the water for an optimum sounding. They are manufactured with that in mind. Transducer installation instructions generally instruct to install the transducer below the running surface. Dragging a transducer at speed tucked up closely to a transom in the "trough" and dragging it below the running surface should be no surprise that all sorts of chaos, "rooster tails" and sounding interference might be experienced. Following basic transom-mounted transducer location rules, and by moving the transducer aftward and up...sometimes above the running surface of your boat, employs a corrective advantage for optimizing a high speed transducer sounding. As far as the risky act of locating smooth, turbulent-free water with "fewer bubbles", in an effort to find a suitable spot for mounting a transducer, all boats create a mess. There is no "clean water" regardless of the design of a boat hull.
  • Major WaderMajor Wader Posts: 702 Officer
    On my jon boat, transducers are an issue. Too low, you get spray and rocks rip them off, too high, and they don't read right.

    I mounted a short piece of Trex deck board on the transom to avoid drilling multiple holes in the hull. Transducer is set too high to read accurately while running, but I get no spray and it reads fine at idle or floating. It also doesn't get broken if/when i run too shallow.
    Joined: Oct 25 2001
    Member #4013
    Canton, GA
  • lemaymiamilemaymiami Posts: 2,696 Captain
    You've got two options with that "kick up" skimmer style transducer... The first is to raise it a bit at a time (until you reach the limits of your existing installation slots in the mounting bracket). Doing that will clear some of your rooster tail - but usually at the expense of your bottom definition when running at speed.... The next choice is to shift the load in your hull if possible (that third angler needs to sit farther forward if possible). You can also change the stand pipe configuration in your livewell so that it holds a bit less water when you're running (a simple swap out back to the regular height standpipe (if so equipped) when you're stationary will bring your water level back up to max desirable...

    If neither of these choices (or a combination of both...) don't do the job you're going to need a through hull transducer... good luck, post up about whatever the fix is that you go with....


    Aren't boats fun?
    Tight Lines
    Bob LeMay
    (954) 435-5666
  • capt.natecapt.nate Posts: 2,359 Officer
    I had my garmin driver glued in. Reads just fine at all speeds.
    http://www.captain-nate.com/
    "If I had my life to live over again, there are some things I’d do differently, but, oh yeah, I’d still be a fisherman. No doubt about that."
    Thomas 'Blue' Fulford
    sig%20pic%20yamaha_zps9bj5fb89.png
  • DunkDunk Posts: 107 Officer
    The reason why you are loosing the read at high speed is because the stern of the TD needs to be lower than the bow of the TD. You can see in the pic how it's higher. Raise the TD mount on the transom then tilt it deeper in the water. Should cure both the spray and the reading.
    Marine Surveyor
  • BluegaterBluegater Posts: 16 Greenhorn
    I have a bay boat that has a similar (Eagle/Lowrance) transducer that kicked a bunch of spray up into the motor but it read well at all speeds. I manufactured a couple of rigs from bent aluminum plate to shield the water back down but they were ugly, sharp, etc. I was in Home Depot imagineering (ala Disney) and found a corner segment of white vinyl roof gutter and the light went on. For a few bucks I cut the corner segment down such that it mounts between the transducer mount and the transom. One flat segment extends above the tranducer and the third inboard. It deflects the spray down and out and works just fine. Did not have to move or adjust the transducer placement which was working perfectly. It is relatively tough material and has lasted a year or so already without any deterioration. This seems like it would work for you. If you're interested, I can take a pic and try to post it.

    By the way. 1) I agree with Dunk on the tilt of the transducer. 2) I have epoxy mounted transom type transducers in the bilge area of other boats. That works well with a minimal signal loss.
  • rehartlinerehartline Posts: 721 Officer
    Bluegater.. do you have a photo of this contraption that you can share?

    Thanks,

    Rob
  • c_captnc_captn Posts: 3 Greenhorn
    Photos of various transom-mounted transducer installations and interesting "rooster tail" containment devices.
    http://www.sternmate.com/ComeAboard.html
  • WildLinesWildLines Posts: 547 Officer
    thanks for all the info. i had to put it there, not further down the V due to the boat has high speed pickups on both sides of the V near the bottom...I wanted to get it into clean water.

    Dunk - I will try raising it and then dropping the rear portion down like you recommended. If that doesn't work I'l either make a spray shield or order a shoot through.
  • kanakakanaka Posts: 343 Officer
    Here's my solution. This is a Humminbird Quadbeam transducer, 2 1/2"X3 3/4". The "wing" is made out of 16ga SS. Because of the mount design, water was pushed up thru the twin pillars and shot straight up. It looked like a jetski impeller stream.

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    0012.jpg
    [SIGPIC][/SIGPIC]
  • FS JimFS Jim Posts: 474 Officer
    Mike at Master Repair in Stuart had a pre-fabbed piece that would bolt right on. You might check to see if they are still available.
  • rehartlinerehartline Posts: 721 Officer
    Humminbird will send you a rubber plug for free to plug the hole between the pillars. It helped, but I'm still dealing with a height issue.
  • c_captnc_captn Posts: 3 Greenhorn
    rehartline wrote: »
    Humminbird will send you a rubber plug for free to plug the hole between the pillars. It helped, but I'm still dealing with a height issue.
    Dragging your transducer around in that "trough" tucked up to the boat and adjusted below the running surface creates all sorts of chaos. Its simply to be expected. Move it up and move it aft into the rising displaced slipstream where is should be. No rubber plugs, gaps filled with silicone or makeshift rooster tail spray containment gizmos necessary.
  • kanakakanaka Posts: 343 Officer
    Humminbird says to use the fore-aft line on the side of the transducer as the guide to level with the bottom of the hull. Are you saying to raise above that line???? As for moving it aft, what do I need, a 4" block to get into the slipstream??? No, wait, get a Sternmate??????
    [SIGPIC][/SIGPIC]
  • BoattronicsBoattronics Posts: 5,071 Admiral
    Good eye Dunk, when I glanced over the pics I didnt notice on the side pic, it is kinda tilted up. Hopefully that will help, but I think he may have to move it further down the v. If there are water pickups ahead of that position, a shoot through or even better thru-hull would be the ticket. The Airmar tilted element is the cats meow, thru hull but flush with the bottom so you dont have to worry about drag or hitting it on the trailer or aground.
    Tony Eden-
    Certified, licsensed and insured, Marine Electronics and rigging master, and "Dream boat" build winner with 20 years of professional experience.
    Boattronics.net
    Over 80 seperate, recent reviews from captains on this forum-
    http://forums.floridasportsman.com/showthread.php?5295-Recent-Boattronics-reviews!
    Please call with any questions or a free estimate for the lowest price/best work available!
    904-545-1270
  • BluegaterBluegater Posts: 16 Greenhorn
    rehartline wrote: »
    Bluegater.. do you have a photo of this contraption that you can share?

    Thanks,

    Rob

    It's difficult to get a single pic that captures the size, shape, etc. but here goes. Very cheap fix!

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