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  • Surf Tabs AND Gates


    CUCV
    • Year: 2005 Brand: Tige Model / Trim: 22v Device Type : Hinged Gate Style, Tab Style Surf Device Material: Stainless Steel Control: Powered with Automated Controller Cost: $1500-$1999 Platform Type: Teak
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    I long pondered building a tab or gate style surf system and in the end figured why not build both.  I felt the ability to independently control the pitch, roll and yaw would help me create the best possible wave.   Initially I thought I was going to go with just a thruster style tab system so I had already drawn them up.  When going to the tab and gate system I had to reduce the length of the tabs to make it work.  Since I had the original tabs drawn up I figured I might as well make them at the same time and test the different designs.

    The .125" stainless tabs and gates were cut on a waterjet.  The hinges are .090" piano hinge from McMaster cut to length and welded on the end.  I used 102F Lenco actuators on the gates and they have 60 degrees range of motion.  They actuate thru the full range in a very similar amount of time as the 101XDS actuators used on the tabs.  The tab extend 12 degrees and retract 25 degrees.  ( I would have set them up to extend more for the short tab but I was trying to balance using one setup for both short and long tabs.)  The hinges on the tabs cross a step in the hull so I cut a wedge out of aluminum flat bar to fill the gap.

    The Arduino controls are in the initial stages of development and just function enough to control the gates and tabs on a bluetooth app but the GPS is not triggering functions.

    Throughout initial testing I have been keeping the boat evenly weighted. In the Bow I have a W711 V bag but only feel I'm getting 250 lbs in it.  I have W712 Enzo sacs in the rear and feel I'm getting 1150 maybe 1200lbs in each of them.  Previously I surfed the boat listed.  Initially with only one rear bag, then added in bow bag, then added DIY suck gate(s) then an offside bag.  I never got to the point where I got a clean wave evenly weighted.

    First test was evenly weighted, gate fully deployed.  I had similar results that I had with the suck gate, a wave that wasn't clean and that I didn't want to surf.  I believe that a taller gate and/or more bow weight could help the wave in this configuration.

    2nd test was evenly weighted, tab fully deployed.  Very surfable wave that was clean on the back end but the lip of the front end of the wave had a dirty lip.  I can see the dirty lip was coming from the swim platform.  Running listed in the past, the surf side corner of my large OEM swim platform was way under water and not disturbing the wave.  By draining off side weight I could clean up the lip and maintain push with a bit of reduction height.

    3rd test was evenly weighted, tabs and gates fully deployed.  The wave looked beautiful but the front end of the wave lacked a defined lip on the front end and the wave lacked push.  We currently surf the wave with the tab fully deployed and the gate 70% extended.  This the point were the front end of the lip gets a touch dirty but is defined.

    I did run a test listed with tab fully deployed.  Obviously the wave height was reduced but surfed a super long wave at 13mph.  I did add in gate but don't recall it making a significant difference either way.  I also tried it with the tab retracted and gate deployed but all I can remember was the tab wave was better.

    Future tests:  I ordered a W707 bag to try more bow weight.  Remove the small tabs and gates and install the larger thruster style tabs.  Make larger plain tabs without the thrusters to get more roll and leave the yaw to the gates.  Make a quick trimmed down swim platform for testing purposes but we like our large swim platform and I know I can get rid of the wave scaring by getting more roll.  I might go so far as to scribe in a bracket on the transom so I can make taller gates.  I feel the gates are to low, but if I can get more roll from bigger tabs this may not be necessary.

     

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    I'll know know more after I try the long tabs alone.  Right now it's been fun having both, we can dial in a nice wave with evenly weighted ballast and 2-10 people in the boat sitting where ever they want.

    With my experience thus far, if I only had one it would be the tabs.  Adding gates from a cost perspective is mostly about the cost of the actuators which isn't all that bad.

    It's a bit hard for me to quantify the value vs. the time spent to do both for the first time.  I was actually working towards a much more elaborate design, which took a bunch of time, but simplified it to this to get it in the water.  When it comes to the install time, I already had all the tools out so there is efficiency in increased quantity.  I drilled 50 some odd holes below waterline for this system.  7 screws broke off flush during the install (including Lenco OEM screws), which was super frustrating.   I bought some screws on Amazon with a different thread pitch and didn't break a single one.

     

    20 hours ago, SONICJK said:

    Hell yeah! I've been wanting someone to give this a go, best of both worlds. 

    So is the wave with the gate and the tab better enough to justify the additional cost and time?

     

     

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    I would love to play with this. Great job. The combo are almost endless. It would take me 100s of hours to find the dial in.  I think I would start fat even both sides gate 100%  add tab as needed. then 90% then 80% then switch to tab fully and add gate as needed  It wouldn't surprise me if it turn out to be 60% gate 40% tab. that is my prediction LOL Kinda what NSS is 60% out the side 40% down.  this is truly awesome Again great job!!!!!!! 

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    Tell me about it!!! Endless combinations!

    As stated earlier I felt I needed more bow weight. I got the new bag to put in the isle but forgot to buy a fitting to run it in line with the V bag. So I just filled the isle bag with about 500lbs. With taps all the way down I couldn't get the bow to come down with Taps even at 1. I added 500lbs of lead on top of the seat as far forward as possible and what a change it made. The swim platform has been 6" below water when ballasted all summer with this setup it's near the surface. Engine rpms dropped and the boat is more drivable with gate deployed.

    On 9/3/2021 at 9:05 PM, AllFAB said:

    I would love to play with this. Great job. The combo are almost endless. It would take me 100s of hours to find the dial in.  I think I would start fat even both sides gate 100%  add tab as needed. then 90% then 80% then switch to tab fully and add gate as needed  It wouldn't surprise me if it turn out to be 60% gate 40% tab. that is my prediction LOL Kinda what NSS is 60% out the side 40% down.  this is truly awesome Again great job!!!!!!! 

     

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    someone finally tried it!  and the dog approves in one of the first pics :D

    from past research and referencing your second test, those tabs might have to retract more to ensure they're not dirtying the lip on the non-surf side.  i bet if you raise your platform a couple inches AND retract the tabs all the way up, it will look much better.

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    The boat and mods are definitely dog approve, they love the new step too.  We have 2 Goldens and they hung with me on the couple all nighters to complete the mods. One night around 11pm I had the garage door open, a skunk walked by the door and the puppy went after it, it sprayed, filling the barn with the nasty odor, that was a very long night.

     

    When I drew it up I went back and forth on the height of the thruster vanes especially with the shorter tabs. CAD said it would clear the waterline coming off the bottom of the hull with my desired retracted angle. (I'm trying to balance short and long tabs with the same setup and my limiting factor is the platform bracket)

    When I first installed the short tabs, I was like,"this won't work" and almost cut back the leading edge of the thruster to get more clearance. So the very first test was... do I get spray off the retracted tabs at various speeds and I don't.

    I can see where the scaring is coming from and how the water flows over/around the platform. I can remove the scar with increased yaw from the gate or increased roll from draining off side ballast and the platform goes deeper in the water on the surf side. When I increase yaw to remove it, I loose push. When I remove offside Ballast I loose height.  Super cool to make these changes on the fly and to see and feel the feedback immediately. With the Bluetooth app in the test stage, the actuators are just named M1, M2, M3 and M4, this has made it easy to communicate with my son which actuator to move.

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    Very nice job on this project, I was thinking of doing something similar but just for the Tabs, and I pondered using the Aduino controle unit, where did you get the circuit plans?  that's the only part that I wasn't sure.

    Again nice work!

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    Thanks @GaryH

    Below is a link to a great build thread with circuit plan for a 2 actuator system that you could use for just tabs.

     

     

    1 hour ago, GaryH said:

    Very nice job on this project, I was thinking of doing something similar but just for the Tabs, and I pondered using the Aduino controle unit, where did you get the circuit plans?  that's the only part that I wasn't sure.

    Again nice work!

     

     

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