Larson Million Bubble ride from 60's

Discussion in 'Boat Design' started by DFAIRCLOTH, Mar 9, 2014.

  1. DFAIRCLOTH
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    DFAIRCLOTH New Member

    Anybody familiar with these hulls and how they perform? I have a 1960 Larson Sea Lion 178 which is a cool looking and well built retro hull. One performance report has a 1961 merc 80 pushing it about 36 mph. Since that is probably about 65-70 hp today that seems pretty good and fully loaded it ran about 32.

    Any info would be helpful
     
  2. gonzo
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    gonzo Senior Member

    Mercury was notorious for underrating the power. 80 might have been 85 HP. Power in 1961 and 2014 is the same.
     
  3. PAR
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    PAR Yacht Designer/Builder

    Everyone under rated their outboards, for racing class advantages in the 50's and 60's, SAE standards in the late 70's fixed this issue.
     
  4. DFAIRCLOTH
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    DFAIRCLOTH New Member

    I was looking more for comments on the hull as is was supposedly famous according to old Larson literature.

    Thanks
     
  5. PAR
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    PAR Yacht Designer/Builder

    Welcome to the forum.

    Nothing "famous" about those hulls, though the marketing team would be pleased you're still buying into their hype. A pretty conventional, pre 63 series, warped bottom hull form.
     
  6. Mr Efficiency
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    Mr Efficiency Senior Member

    Where are the million bubbles ?
     
  7. DFAIRCLOTH
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    DFAIRCLOTH New Member

    Supossedly the lapstrake hull design created the bubbles and the adds had underwater pictures showing the bubbles flowing under the hull.....Either way it is a cool old boat :)
     
  8. Mr Efficiency
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    Mr Efficiency Senior Member

    I suppose the same could be said for the myriad swaged aluminium boats on the market. I doubt it increases hull speed, what with all the extra surface area created, even if the bubbles "lubricate" the bottom a little.
     

  9. PAR
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    PAR Yacht Designer/Builder

    The bubbles actually slow the boat down, not speed it up and all lapstrakes make bubbles. On a technical level, the bubbles decrease the water density locally, which causes the boat to settle a bit, which requires more power to over come. Good marketing hype, that stands the test of time . . .
     
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