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  • Adding Trim Tabs

    We have had a couple rough water rides home, the last one from the South East tip of vashion to Manchester in probably 15-25 knot winds, and I want to get the bow of the boat into the chop better and when needed even out the uneven load condtion.

    First I removed everything I could from the stern, I also had to add a mount for the kicker to keep it away from the trim tabs, once everything had been removed I cleaned and polished the transom the area where there had once been a plastic kicker mount was gross, the rest was pretty stained and dirty, I knew once the tabs and other equipment it would be very difficult to get in there and polish it well, those pictures are on the Gelcoat restoration thread.
    Anyway it was a pretty simple instal, six screw holes for each hinge and 3 for each actuator/driver plus a center hole for the wires ( a liberal use of 5200), took me about an hour to set up and measure, then maybe another hour to instal, the wiring was very simple as I have the baisic up down left right system, no relays, you just have to remember to pick them up when you shut down, just like you remember to lift your motor when you trailer it, also backing up quickly with them down would probably not be too good for them...
    Ill let you know how the sea trial goes in the next few days.
    Attached Files

  • #2
    they look like Bennett elecrtic tabs
    1980 2400 Cuddy I/O, 2017 Cummins 4BT coupled to a Volvo DP-SM with F9 Props, and a 2014 Mercury 15HP Pro-Kicker "LOOSE CHANGE"

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    • #3
      Originally posted by noluck View Post
      they look like Bennett elecrtic tabs
      That they are, I went around several times between these and the pump and line models, this seemed much easier to instal myself..

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      • #4
        We took the boat out yesterday for a trial on the new trim tabs, lol let me tell you a little goes a long way when it comes to adjusting the attitude of the boat. We took off out of Manchester, I trimmed the tabs down as we launched the nose never came up but as we got to speed the boat felt like it was steering/handeling dangerously, I slowed down, and tried again, this time using much less trim to get up and backing off with a couple quick blips of bow up, now the boat felt tight, angle of attack was good, the bow was slicing through the chop with out trying to direct the boat. In the end we found that launching was best with four quick blips of bow down, then when shes on plane (which is super fast now) back off with two blips of bow up and the ride is smooth and predictable, we hit a few wakes at full tilt ( 32 mph) and no pound at all, they were small wakes for bigger ones Ill still slow down a bit, and boat handles differently it took a little while to get used to it, but the changes are all positive and I am very happy with the purchase, the only thing I would do differently is next time I would go with the 12x9 instead of the 12x12 they reccomended to me, on a 19 foot boat they are more than it needs and because of that the control is very sensitive taking a very light touch to make a significant difference in the boats attitude.

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        • #5
          electric tabs are way faster that hydraulic, yes tap the contoll and not hold it down
          1980 2400 Cuddy I/O, 2017 Cummins 4BT coupled to a Volvo DP-SM with F9 Props, and a 2014 Mercury 15HP Pro-Kicker "LOOSE CHANGE"

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          • #6
            My hydraulic are too fast as it is! I barely tap and away they go.

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            • #7
              Originally posted by Cummins12V98 View Post
              My hydraulic are too fast as it is! I barely tap and away they go.
              Mine are too, plus I upgraded to the larger 30"x12" over the OEM 30"x9" ones.
              "Joint Venture" 1978 28' twin 2017 Vortec roller cam 383/6.3L 350hp engines - You name it, I've either replaced it, restored it, rebuilt it or repaired it. That's my job now that I'm retired.

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              • #8
                Originally posted by Bill V View Post
                Mine are too, plus I upgraded to the larger 30"x12" over the OEM 30"x9" ones.
                I learned something the hard way! I was cruising at 3K around 21mph and I hammered it. The thing pulled left and it wanted to go deep sea diving! Trim at one speed is NOT good at another. Then I hit the wrong side of the trim button and scared the HE!! outa me.

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                • #9
                  Originally posted by Cummins12V98 View Post
                  I learned something the hard way! I was cruising at 3K around 21mph and I hammered it. The thing pulled left and it wanted to go deep sea diving! Trim at one speed is NOT good at another. Then I hit the wrong side of the trim button and scared the HE!! outa me.
                  Reminds me of when I sea trialed my 2006 repower with the Crusader 310hp engines. I and the mechanic were out running around Bellingham Bay and testing various RPM's to check various things out when he said for me to hit WOT and see what the boat could do. I gradually brought it up in speed, carefully adjusting tabs. At 4800 doing about 38-39mph the boat started to list over to starboard a little and I hit the port tab to level it out. All of a sudden the boat slammed over on the port chine and threw me out of the seat and on the deck. Since then I'm very careful about adjusting trim. It's very easy to over trim at speed.
                  "Joint Venture" 1978 28' twin 2017 Vortec roller cam 383/6.3L 350hp engines - You name it, I've either replaced it, restored it, rebuilt it or repaired it. That's my job now that I'm retired.

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                  • #10
                    Once the tabs are "pressing" on the water, a little goes a long way....

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                    • #11
                      Originally posted by Cummins12V98 View Post
                      I learned something the hard way! I was cruising at 3K around 21mph and I hammered it. The thing pulled left and it wanted to go deep sea diving! Trim at one speed is NOT good at another. Then I hit the wrong side of the trim button and scared the HE!! outa me.

                      Right!!!

                      Im happy with the purchase, when used in moderation they are quite effective, I doubt Ill see much fuel savings because Im now just going faster at the same RPM so if I slowed down to my normal cruising speed I would probably save a bit.
                      We also had a scary moment when I went for bow up and hit down on one tab, carved hard to starboard and felt like it could roll if I hadnt cut the power, Im surprized the dont have a very loud clear warning on the insructions about being very very gentle when trimming the boat for the first time out, myself if I were to make thse I would slow the adjustments way down, maybe to 1/10th the speed they are now, so you can gradualy feel the adjustents to the boat, rather than have them be so significant immediatly, even with a light touch..

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                      • #12
                        i don't use them for mileage, just to fine tune the level of the boat or drop the nose to push through rougher water
                        1980 2400 Cuddy I/O, 2017 Cummins 4BT coupled to a Volvo DP-SM with F9 Props, and a 2014 Mercury 15HP Pro-Kicker "LOOSE CHANGE"

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                        • #13
                          Originally posted by noluck View Post
                          i don't use them for mileage, just to fine tune the level of the boat or drop the nose to push through rougher water
                          Same here, I was just stating that because they claim a big savings in fuel, I am not sure we realized any large gains but the boat rides like a larger boat with the correct angle of attack my 79 and 80 year old parents greatly appreciate the reduce pounding with going into a 20-30 mile an hour headwind like we got comming home from Blake the other day.

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                          • #14
                            I had them on my old aluminum boat, and considered it for 'Hooky', but don't think I have room on the transom. Besides, the original owner put a hydrofoil on which helps. I just added two vertical hydrofoil fins from Uncle Norms, to the top of the hydrofoil so that I can get a bit better low speed handling which is what they advertise them for. Will let you know how that turns out...
                            GlasPly72PDX
                            Play'n Hooky
                            1972 GlasPly 171 Runabout
                            Mercruiser 120 I/O

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                            • #15
                              Due to the narrow beam of GP's, except the 28's, tabs are almost a must. We have them on our 23' and 28'. But, once at the speed we want to run, slight "taps" generally works well, until you get some active people on board that want to go from side to side to see some widget then it becomes an active process since the boats will definitely react to weight/load movements while underway...

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