Redesign Black Skimmer

Discussion in 'Boat Design' started by David Ford, Jan 15, 2022.

  1. David Ford
    Joined: Jan 2022
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    Location: Victoria BC

    David Ford Junior Member

    Having had such a marvelous response to my first query, I am going to be so bold as to trouble you again.

    For some reason Mr. Bolger elected to make the cockpit on this boat 10 feet long and the cabin area only 4 feet. This makes any interior arrangements challenging, particularly as the ladies in the family insist on a private head.

    I am thus contemplating extending the cabin area back to the next frame, which is best seen in the third diagram below:

    [​IMG]

    I will need to remove some material to make this happen, but I note that it is currently 1/2 inch plywood, so I can't believe it is adding much strength or rigidity. What do you think?

    If you would like to get a better idea of the structures involved Dr. Google will give you numerous images.
     
  2. upchurchmr
    Joined: Feb 2011
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    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    Is that all?
    Such a marvelous opportunity to improve the boat.
    Outside chines would be my first change. Ugly and draggy.
     
  3. sharpii2
    Joined: May 2004
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    Location: Michigan, USA

    sharpii2 Senior Member

    I think Mr. Bolger intended the boat to be more of a day-sailor, with maybe some weekending possibilities. By lengthening the cabin that much, it seems like you are ending up with a tiny cockpit. Not only that, but with everyone in the cockpit, the crew weight moves pretty far aft. Why not split the difference, and maybe add a new ring frame?
     
  4. David Ford
    Joined: Jan 2022
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    Location: Victoria BC

    David Ford Junior Member

    Sorry, I think you misunderstood. My plan is to extend the cockpit back 2 feet. This would make it 6 feet long, and the cockpit 8. Seems plenty big enough still.
     
  5. PsiPhi
    Joined: May 2007
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    Location: Queensland

    PsiPhi Newbie

    Hi David,
    I have always loved the look of that design.
    Building a custom wood sailboat, the 25' Black Skimmer https://www.nexusmarine.com/skimmer_interiors.html
    Building a custom wood sailboat, the 25' Black Skimmer https://www.nexusmarine.com/skimmer_exteriors.html

    One word of caution, and it think it is something Mr Bolger had mentioned, somewhere, and something Jim Michalak (who has a number of basic, flat bottom designs) discusses, and that is to be careful of how much extra weight the additional cabin sides and top are adding. Because the wieght is being added high up in a boat that, in it's original form, is probably quite well balanced it may put you at greater risk of a knock-down.

    People who know more than you or I can probably confirm or deny that.

    Simon
     
  6. David Ford
    Joined: Jan 2022
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    Location: Victoria BC

    David Ford Junior Member

    Thanks for this. It is the kind of thinking I was hoping for. The builder decided to put 700 pounds of lead into the bottom of the boat (he had a free source). This is 200 more than Bolger recommended. So I think I have some room to play, and I will be careful to go as light as I can. But I am concerned about the structural implications if I start shaving down the bulkhead and frame too much. Also I realize the look will be changed. I plan to do a cardboard version to see if I can stand it. Like you I really like the existing shape.
     
  7. PsiPhi
    Joined: May 2007
    Posts: 181
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    Location: Queensland

    PsiPhi Newbie

    I was also watching, a few years back, the growth in popularity of Nowark Island Sharpie (NIS) by Bruce Kirby, and although it has always been a flat bottom sharpie, like Black Skimmer, one of the later developments to it was to slightly round the bottom. I don't recall what the intended benifit was, but it was hailed as a success.
    They also had a large amount of lead balast.
    You may find more information about that from Stray Dog Boat Works.
     
  8. David Ford
    Joined: Jan 2022
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    Location: Victoria BC

    David Ford Junior Member

    Thanks for introducing me to Stray Dog. Lots of fun fossicking around in their site. Like me, Kirby is Canadian. From Oakville Ontario.
     

  9. David Ford
    Joined: Jan 2022
    Posts: 19
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    Location: Victoria BC

    David Ford Junior Member

    I wonder if reducing the size of the cockpit might actually help with rightability. More convex area, less concave.
     
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