Transom strength

Discussion in 'Restoration Projects & Questions' started by Pat Colvin, Oct 2, 2016.

  1. Pat Colvin

    Pat Colvin Hydrodyner

    Joined:
    Sep 20, 2016
    Messages:
    51
    Boat Model and Year:
    it is a Hydrodyne but not sure what year just boug
    hello again sorry to be a constant want help boater but new to these great boats. I have to replace the transom as the fiberglass outer skin is cracked on both sides of the motor. The is a 1/4 " aluminum pale that the motor bolts through about 14\" by 12" in size i have a 115 1994 Johnson and the fiberglass person who i may get to do the work has asked what hp the boat was rated for, i am hoping to eventually go to a 200 hp can any one help with what i need to do to build a strong solid transom ty
     
  2. dynegreg1

    dynegreg1 King Dyner

    Joined:
    May 31, 2006
    Messages:
    587
    Location:
    Pingree Grove, IL
    Boat Model and Year:
    1990 Hydrodyne 20 Open Bow
    Ski Team:
    Skimmer/Aquanut alum
    Go to the forum on the site. There are many threads to read up on about restoring your boat in the restoration section.
     
  3. jim

    jim Hydrodyne 18 Specialist

    Joined:
    Jun 14, 2006
    Messages:
    2,321
    Location:
    FL
    Boat Model and Year:
    77 Dyne 18 I/O converted to Outboard
    Experience has shown that the transom as designed will handle 200 hp and more. I think 150 is plenty for private use. The 150's are lighter too. Many of the boats had no hp rating plate. Which 200 are you considering?

    jim
     
  4. Pat Colvin

    Pat Colvin Hydrodyner

    Joined:
    Sep 20, 2016
    Messages:
    51
    Boat Model and Year:
    it is a Hydrodyne but not sure what year just boug
    at this time i am not sure, weight would be my main consideration
     
  5. tj309

    tj309 Composite Specialist

    Joined:
    Jul 19, 2010
    Messages:
    399
    Location:
    LA (lower Alabama)
    Boat Model and Year:
    1972 18' Hydrodyne
    Ski Team:
    Former Hodag Water shows
    The Dyne I grew up with was an early '70's 18 and for the ski show we put twin 115 Johnsons on it for a total weight of somewhere around 700 pounds. The ski show now has a new boat (I don't know how new) but it is identical to the '70's era boats and has twin 150 Mercs on it - probably about the same weight. Weight does not seem to be a problem especially with a single IMO. The problem again IMO is with the structural integrity of the transom to handle high HP motors. The way they integrated the rear deck and transom spread thrust loads throughout the structure. My project is an early 70's that I am setting up for twin 150 Merc 4 strokes. Heavy in the stern but my gas and batteries are under the bow. I have also extensively beefed up the entire rear of the boat's structure in order to handle the weight and HP. My project can be seen in the restoration thread "1972 Keel Up Restoration". Good luck with your project as you will have a true head turner when done.
     
  6. Pat Colvin

    Pat Colvin Hydrodyner

    Joined:
    Sep 20, 2016
    Messages:
    51
    Boat Model and Year:
    it is a Hydrodyne but not sure what year just boug
    thank you for the help greatly appreciated
     

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