Bay boat hybrid hull design

Discussion in 'Boat Design' started by PBC, Aug 17, 2020.

  1. ondarvr
    Joined: Dec 2005
    Posts: 2,556
    Likes: 344, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    Don't use the Duratec primer directly over epoxy with micro balloons in it. It can create bonding problems.
     
    philSweet likes this.
  2. PBC
    Joined: Aug 2020
    Posts: 13
    Likes: 3, Points: 3
    Location: South Africa

    PBC Junior Member

    I have a boat of similar hull shape so there is a tested history behind this type of design .This hull does have a slightly finer entry and the forefoot is raised a little. And it has a bit more volume higher up as you have seen. Hopefully it’s an improved ride and not an overshoot into what you have described. My existing boat is exceptional in a following sea and does not have the problems you suggest . But obviously the possibility exists.
    There was no budget for a top quality mold and a test boat - but I am comfortable enough with the design to roll the dice.
     
  3. PBC
    Joined: Aug 2020
    Posts: 13
    Likes: 3, Points: 3
    Location: South Africa

    PBC Junior Member

    Hi, thanks yes I am aware of this - I couldn’t find a heat stable polyester filler to use- so went with the epoxy- but now the micro balloons are a problem. I have been told to paint with an epoxy primer before applying the Duratec primer. What would you suggest ? Your input on this would be greatly appreciated.
    Thanks
     
    fallguy likes this.
  4. ondarvr
    Joined: Dec 2005
    Posts: 2,556
    Likes: 344, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    Just a coating of regular epoxy works fine, frequently epoxy primer costs more than just epoxy.

    Either one needs to be cleaned and sanded prior to applying the primer.
     
  5. PBC
    Joined: Aug 2020
    Posts: 13
    Likes: 3, Points: 3
    Location: South Africa

    PBC Junior Member

    Great THANKS!
     
  6. PBC
    Joined: Aug 2020
    Posts: 13
    Likes: 3, Points: 3
    Location: South Africa

    PBC Junior Member

    We finally got to the point where we where happy to spray the Duratec primer. Have subsequently spent a lot of time fixing areas we where unhappy with. Plan to respray to get everything uniform and then flat and top coat
     

    Attached Files:

    ondarvr likes this.
  7. fallguy
    Joined: Dec 2016
    Posts: 4,146
    Likes: 687, Points: 123, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    Is this 1/3rd or the actual full scale mold?

    why would you bother at 1/3rd?

    looks interesting, wish I had better comments on the hull...all I am wondering is how it will do at drift; looks like it'll rock some

    I, too am surprised you didn't build the boat, test it, modify, then use it as the plug. Errors now you are stuck with?
     
  8. gonzo
    Joined: Aug 2002
    Posts: 15,120
    Likes: 897, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Yes, 1/3 is unusual. Building a boat as a prototype and modifying it until things work well is common.
     
  9. PBC
    Joined: Aug 2020
    Posts: 13
    Likes: 3, Points: 3
    Location: South Africa

    PBC Junior Member

    This is full size 24.4 foot. The 1/3 rough model was to test if the hull was developable , going from Delftship model to plug using mdf -without strip planking and using as few skin panels as possible.

    Obviously there is a lot to consider boat to mold vs plug to mold. But I’m still sleeping at this stage...
    Hopefully your surprise doesn’t turn into amusement once the boat is on the water .
     
    fallguy likes this.

  10. fallguy
    Joined: Dec 2016
    Posts: 4,146
    Likes: 687, Points: 123, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    At least for me, no amusement if you fail.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.