hull problem 75 hydrodyne 18ft

Discussion in 'Hydrodyne 18' started by 75hydrodyne, May 10, 2011.

  1. 75hydrodyne

    75hydrodyne

    Joined:
    Mar 30, 2010
    Messages:
    4
    Boat Model and Year:
    18 ft 1975 hydrodyne 175 johnson
    Ski Team:
    no
    Ok now i have a problem trim is Ok angle and operation. what i found is at the back of the hull has a slight hook to it when i had the boat flipped over during painting i guess i never payed attention to that. hook must be about a foot round and about 3/8 in at worst this is on both side and at the rear of the boat. this is probably causing water to force down words and away from the prop causing my cavitation problems and also my nose of boat to be forced into the water at about 26 mph also causing lack of top end. can anyone tell me what i should do to fix this problem . also there are no soft spots on the hull and the floor was replaced with some stringers about 15 years ago old owner told me the boat always did this but i want to fix the problem... please help thanks. :D
     
  2. 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
    Tap on the hull with a hammer. A "dead" sound indicates water in the balsa core.

    The hull must be straight for good performance.

    I am not sure that I follow your description, but a 3/8 hook is huge and would destroy the performance.

    The boat was definitely not built that way.

    jim
     
  3. Dyna-Kid

    Dyna-Kid Boat of the Month

    Joined:
    Oct 19, 2007
    Messages:
    203
    Location:
    Lake Metigoshe, ND
    Boat Model and Year:
    74 18 Hydrodyne 150 / 06 17.6 Dyna-Ski 150 Merc FS
    Ski Team:
    Club de Skinautique
    I agree. Sounds like a transom repair gone bad or the hull has serious structural issues.

    Do you know if the transom was ever replaced? How far forward of the transom does the hull start to angle down?

    Kevin
     
  4. 75hydrodyne

    75hydrodyne

    Joined:
    Mar 30, 2010
    Messages:
    4
    Boat Model and Year:
    18 ft 1975 hydrodyne 175 johnson
    Ski Team:
    no
    the transom has never been replaced or repaired and as far as my friend that owned the boat before he had only replaced the floor and one stringer that's all the history i have on it . ill try to get some pictures of the spot that im talking about
     

Share This Page