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planing help

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  • planing help

    I need some help guys.

    i got a 16' lowe semi tunnel hull jon that i cant get to plane out.when i first got the boat it had a 25hp johnson that i got to plane once only because i hit another boaters wake. now i have a 35hp evinrude but still cannot plane.i was having alot of problems with boat drag because the motor sat to low mainly because of the tunnel.i bought a manual jack plate and got the cavitation plate about a half inch from being level with bottom and it now has a 4in offset but it still isnt enough.any ideas? i havent played with my tilt very much not sure which way does what. do you think i just dont have enough motor for the boat?any help greatly appreciated
    1990 17ft Bomber fish&ski
    120 hp force


  • #2
    Re: planing help

    I use a DeWalt DW733 for planing.
    2012 Tahoe 24' Fish-N-Fun Tritoon.
    115 Merc 4 Stroke w/13.75 X 13 3 blade aluminum prop
    Tow rig: The Galactica: 2004 F-250 w/V-10 Triton
    http://www.boatus.org/onlinecourse/default.asp

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    • #3
      Re: planing help

      Probably need to raise motor. Got Pics of setup? tunnels are a different animal. Have contacted Lowe for help?

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      • #4
        Re: planing help

        i can take a pic tonight.no havent talked to lowe but would a half an inch make that much difference?before the water out of tunnel was hitting foot and spraying everywhere.now that i got the jack plate the water is hitting just under the ribs above the cavitation plate and getting a little spray.the one and only time i know it was really planing, water was only going backwards no spray
        1990 17ft Bomber fish&ski
        120 hp force

        Comment



        • #5
          Re: planing help

          Water is hitting above the vent plate. Not good. Where are your pics?
          Boat- ryder I don't want to be a Smart ***** but the set up on those boats need to to run off the water comming off the water from the transom in clean water. PICS PICS. I'm Done without PICS

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          • #6
            Re: planing help

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            sorry it took so long
            1990 17ft Bomber fish&ski
            120 hp force

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            • #7
              Re: planing help

              Still out there "Duckdown"?
              1990 17ft Bomber fish&ski
              120 hp force

              Comment



              • #8
                Re: planing help

                When you say the boat won't plane off, what exactly is it doing? Is the prop ventilating and the motor reving, but not able to push it up onto plane?

                Those Lowe "tunnel" boats are referred to as "tunnel jets" by Lowe. I do believe they are intended to be powered by outboard jet drives for running in shallow water.
                Have a nice day!

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                • #9
                  Re: Planing Help

                  While I am no expert on OBs by any mean....

                  I might suggest that you Trim IN all the way to start.
                  Trim In = Bow Down; Out = Bow up!
                  And/Or get some weight (Passenger?) into the bow to flatten the ride.

                  The Anti-Ventilation (AV) Plate should be wet on the bottom and dry on the top when on plane.
                  Just skimming the surface.
                  Hold a long straight edge against the tunnel to see where it lands on the AV Plate.
                  Start with the AV Plate an inch or two above the plane of the tunnel.

                  If the prop Ventilates (Sucks Air), Lower the motor an inch.
                  If it doesn't, keep raising the motor until it does, and then lower it back to where it didn't.

                  Click image for larger version

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                  Bill, Lorain Ohio
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                  • #10
                    Re: planing help

                    ok my motor must still not be high enough because the water is hitting off of the ribs right above the cav plate so both sides of cav plate are wet.and i will try trimming it in all the way.my bow is coming up but not too much, im just not skimming the water
                    1990 17ft Bomber fish&ski
                    120 hp force

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                    • #11
                      Re: planing help

                      In My opinion, you are still to low. The only way to figure this IS to unclamp motor from bracket and place 2" square tubing under clamp and retighten. Water test. If to high go to 1 1/2" 1" untill you find the sweet spot. Looks like you have a long shaft motor on there. YES?

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                      • #12
                        Re: planing help

                        Originally posted by Mi duckdown View Post
                        In My opinion, you are still to low... Looks like you have a long shaft motor on there. YES?
                        Looks too long to me too.

                        What is your transom Height? and Shaft length?
                        The transom height is the distance from the tunnel to the transom edge.

                        The shaft length is the distance from the bottom of the mounting clamp to the bottom of the AV Plate.
                        The shaft length is hard to measure directly, but it will be a multiple of 5.
                        So if it looks to be something like 21-1/2, it is a 20.

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                        -----------------------------------------
                        P.S. It is an Anti-Ventilation (AV) Plate not a Cavitation plate.
                        Ventilation and Cavitation are two completely non-related phenomenon.
                        Sorry to be the language Cop.
                        Bill, Lorain Ohio
                        ---------------------------------------------------
                        If you have not already done so....
                        To help you get better answers, Specific to your Location.
                        At the Top Right of this page, Click on 'Your Name'.
                        Then Click "User Settings".
                        In the "Location" Box, Enter your General Location. City, State.

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                        • #13
                          Re: planing help

                          i will measure soon as i get home tonight.i dont think its a long shaft. from what ive seen other long shafts look like.thinking about what your saying about the spacer i dont think i can go 2 in without my clamps being right on the top edge of jack plate which i wouldnt trust but i can raise plate up a hole and get about an inch and then add a 1 in spacer and still keeps the clamps in a safe spot.will let you know soon.thanks
                          1990 17ft Bomber fish&ski
                          120 hp force

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                          • #14
                            Re: planing help

                            Boat- ryder. I quess I wasn't completly clear. My Bad. my post was just to give an idea of how high to raise it for a temporary fix. When that issuse is solved, then you can mount the motor permanently at what ever height is needed.

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                            • #15
                              Re: planing help

                              Ok I got ya, just measured, my shaft is 16 in and transom from top to top of tunnel is 14 1/4. If I didn't have the tunnel the av plate would prolly been in the perfect spot. Just for my knowledge 16 in is short shaft right? Looks like rain this weekend but will update soon as I can water test. Thanks for all the help
                              1990 17ft Bomber fish&ski
                              120 hp force

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