Tumblehome in Performance Dinghy Hull Design

Discussion in 'Sailboats' started by Doug Lord, Dec 4, 2009.

  1. Doug Lord
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    Doug Lord Flight Ready

  2. wet feet
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    wet feet Senior Member

    The canoe is a little removed from the typical performance dinghy in that it uses the plank to generate righting moment and the loss of beam at deck level makes no change to this aspect of the boat.In addition,the self draining nature of the boat makes the shipping of water less of an issue.The slight saving of weight resulting from the reduction in total surface area of the hull and deck probably justifies the approach.
     
  3. ancient kayaker
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    ancient kayaker aka Terry Haines

    Don't see the point unless you are a fisherman. Tumblehome is fairly common in canoes for easier paddling, but it would seem counterproductive in a rowboat unless it had outriggers and in a sailboat it would make hiking more difficult. In a motorboat it would likely make it a wetter ride and I suspect it is mainly done for style.
     
  4. bistros

    bistros Previous Member

    Steve designed in tumblehome on Wonk to aid quick draining of the deck, as it was a wave piercing design that goes through wave and chop instead of over it. The IC doesn't ever have anyone hiking (it has a sliding seat).

    Performance planing boats generally go in exactly the opposite direction to tumblehome, with wide flaring sides allowing a narrow beam at waterline and a wider hiking/trapezing platform at deck height. Canoes are a different breed entirely.
     
  5. ancient kayaker
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    ancient kayaker aka Terry Haines

    Submarines are different too! :)
     
  6. gonzo
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    gonzo Senior Member

    Don't say concrete
     
  7. ancient kayaker
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    ancient kayaker aka Terry Haines

    I won't! I promise!
     
  8. CTMD
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    CTMD Naval Architect

    IIRC the IC rules don't allow flare. Adding some tumble home will help stiffen the panels without increasing the weight.
     

  9. gggGuest
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    gggGuest ...

    They do, although there are limitations. But there's limited value in having flare.
     
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