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Thread: Drag plate ?

  1. #1
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    Drag plate ?

    Can someone please explain exactly how a drag plate works ?
    and possibly post pic's of their drag plates.

    I think they must be called something else over here as nobody seems to know what I am asking about .

    all I have found is a very simple flat plate plate, but that cant be right.

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    Look on Allison's site for info... actually look at the "skid planer" and the "planing foil" while you're there: http://www.allisonboats.com/content/specials/

    And from a member here: http://www.screamandfly.com/showthread.php?302613

  3. #3
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    Ahh I see
    so its a hydrofoil thing like doel fins. thanks for that. in uk we call them hydrofoils.

    I thought it was something that attached to the jack plate.
    But now I know ha ha

    ive got doel fins sitting in the garage, they do work good as ive used them on a few boats.
    But I like the look of those Allison type things.

    now have to go find a road sign or something similar .

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    Some people make a plate that covers the bottom opening of their jack plate and I've also heard of that being called a drag plate. When you take off from a dead stop a jack plate (especially a large one) can drag in the water and in effect hold the boat back. The plate covering the bottom minimizes that.

    John
    I was going so slow I almost crashed. - JamesGang

    1978 24 Superboat - 250 EFI
    Sold: 1991 Starliner - 250 EFI Merc 3.0

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    Did you look at the 'skid planer" on the allison site?

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    Yeah I looked on the allison site at their stuff.

    the plate under the jack plate is what most over here in uk thought was a drag plate !!! worth a try I suppose, plus it would strengthen the jack plates rigidity.

    I have seen a few on the net since last night where they have even put floatation foam inside the jack plate ?
    does this little bit of foam realy give buoyancy that is noticeable ?
    Last edited by phillnjack; 10-21-2016 at 10:54 AM.

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    water hits plate then pushes transom up time to plane is reduced , some put inner tubes beach balls in there setback brackets

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    we've been selling top and bottom plates for our jack plates for years.
    and adding flotation inside is a great idea for bigger setbacks.
    98 XR2001 Drag w/pro stock mota

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    all sounds very good idea to use the extra flotation.
    I presume its best to ram as much flotation in as possible on static jack plates/setback /

    thanks for info Guys.

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    Do drag plates or hydrofoils mounted on the lower unit hurt or help on long TOP END runs in the 110 to 120mph range?

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    They shouldn't be anywhere near the water at those speeds. Even at half that speed most boats we deal with on this forum the cavitation plate is nowhere near the water.
    I was going so slow I almost crashed. - JamesGang

    1978 24 Superboat - 250 EFI
    Sold: 1991 Starliner - 250 EFI Merc 3.0

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  14. #12
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    Quote Originally Posted by PaulR View Post
    Do drag plates or hydrofoils mounted on the lower unit hurt or help on long TOP END runs in the 110 to 120mph range?
    dont hurt a bit
    may even help keep boat more stable when strung out kinda like a little kite back there,on my twister at top speed seems real stable more so with them on vs off ,am i being silly or not

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    Quote Originally Posted by PaulR View Post
    Do drag plates or hydrofoils mounted on the lower unit hurt or help on long TOP END runs in the 110 to 120mph range?
    A few guys have recently seen loss of a couple mph on the big Xb-21 allison bass boats , i haven't tested it on my boat yet as I care more about holeshot than big end.

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    Triad has been making these out of Carbon Fiber since 1995. Great Drag Plate..Mounts to cavitation plate on lower unit. Click image for larger version. 

Name:	IMG_3660.jpg 
Views:	50 
Size:	392.6 KB 
ID:	359681

  17. #15
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    Quote Originally Posted by Triad Boats View Post
    Triad has been making these out of Carbon Fiber since 1995. Great Drag Plate..Mounts to cavitation plate on lower unit. Click image for larger version. 

Name:	IMG_3660.jpg 
Views:	50 
Size:	392.6 KB 
ID:	359681
    When are you going to sell cf plates like the one the Crabbs ran on their Qmaster? I've been waiting 2+ years for one.... thought you were going to make a mold and kick out some more.
    Last edited by StratosVT; 11-01-2016 at 09:03 PM.

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