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  1. #1
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    How much will my boat sink if i add a jackplate

    Hi! Coming weeks i will be upgrading my boat from a 115hp Merc 4 cyl to a 150HP V6 Merc. Both 2 stroke.
    Also, i am adding a 6 inch jackplate on the rear (this weighs 30kg / 66lbs)
    My 115 weighs about 154kg / 340lbs (?). The 150 weighs about 184 kg / 406lbs.

    Now i am wondering, how far will my transom sink into the water after i add this weight? Ore more someone experienced could give me an indication of how far the mentioned amount of weight will push a boat down?
    Boat is a Fletcher 16 arrowsport, about 1.8meters wide (6 feet) and has a deep V.
    I once stood on the rear of the boat with a buddy (me 70kg / 150lbs) and my buddy (100kg / 220lbs) and that was on the edge of fine. No water entered the splashwell yet.

    Here is my boatClick image for larger version. 

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  2. #2
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    Add the estimated weight in people again. I would hope it doesn't go more then half way to the top of transom then in pic. I would suggest inspecting your splashwell for water intrusion. Seal and/or add boots to rigging. Assume at some point water will top transom. It may be when coming off plane or when boat is idle and a passing wake hits the stern. Most splash wells will be OK . Make sure yours will be too.
    Jim

    www.jrsperos.com

    10 Meter Fountain
    28 Skater

  3. #3
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    Weight is weight. You want to add an extra 60kg on the transom and you weigh 70kg. Sit on your engine and see how far the stern goes down.
    1971 Sidewinder 14 SS w Johnson 90 v-4
    1959 Texas Maid Falcon w Mercury Mark 35A

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  5. #4
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    This may sound nuts but a bunch of us will put a beach ball in the center of the jack plate and inflate it. You’d be surprised how much buoyancy you can get just from doing simple things like that.
    1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!

  6. #5
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    i'd be more concerned with tha integrity of tha transom, kickers/stringers more than tha weight...

  7. #6
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    Im working on the transom at the moment.
    4x 10mm ply with 3 layers of 450 csm in between echt of them. 2 layers 450 and 2 layers 290 woven on the inside.
    All layers are overlapping to the hull.
    Today i Will add transom knees and also the splashwell Will me connected to the outside transom with 450 and 290.Click image for larger version. 

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  9. #7
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    Looks good. I added an extra pair of knees in my build. Four total. Rock solid.
    1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!

  10. #8
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    Quote Originally Posted by killerpirate View Post
    Im working on the transom at the moment.
    4x 10mm ply with 3 layers of 450 csm in between echt of them. 2 layers 450 and 2 layers 290 woven on the inside.
    All layers are overlapping to the hull.
    Today i Will add transom knees and also the splashwell Will me connected to the outside transom with 450 and 290.Click image for larger version. 

Name:	IMG-20220629-WA0013.jpg 
Views:	21 
Size:	440.1 KB 
ID:	506878

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