hull design

Discussion in 'Boat Design' started by hydrofoil14, Jan 18, 2008.

  1. hydrofoil14
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    hydrofoil14 New Member

    hi im a student designing a small high speed hydrofoil boat.

    ive found lots of info on the foil itself but im struggling to find information on hull design, particularly designing a suitable frame.

    any pointers on where to look would be greatly appreciated, and any other tips on hydrofoil design are welcome.

    thanks
     
  2. kach22i
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    kach22i Architect

    Have you seen this site yet?

    http://www.foils.org/

    Video's, book suggestions and a good source on foil history.
     
  3. hydrofoil14
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    hydrofoil14 New Member

    yeah to be honest pretty much everywhere ive looked has ended up back there, but i havent found anything specific for working out how how to support the structure of the hull, or realistic forces it will need to withstand.

    even info on hulls on regular boats would be useful, i just need some background to base my designs on

    thanks anyway
     
  4. Trevlyns
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    Trevlyns Senior Citizen/Member

  5. BMcF
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    BMcF Senior Member

    Unfortunately, using conventional hull design scantling rules straight up does not work well with hydrofoil design. You end up with a hull that is too heavy.

    We built a 43' aluminum hydrofoil demonstrator craft and, to over simplify perhaps, I would say that taking the same approach that airframe designers do is more useful and approximates what we did. You do have to pay attention to plating thickness and frame scantlings where slamming will occur, but overall, designing a frame system that is supported on only several hard points (wings) will result in a strong but light hulll where, in many areas of it, the skin or plating contributes little to the global strength.
     
  6. kach22i
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    kach22i Architect

    Makes sense, and would explain this glass bottom hydrofoil.

    Link:
    http://www.shiptraders.com/index.php?a=2&b=818
     
  7. Trevlyns
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    Trevlyns Senior Citizen/Member

    Will it ever end?
     
  8. BMcF
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    BMcF Senior Member

  9. Guest625101138

    Guest625101138 Previous Member

    What will power it?

    How fast do you want to go?

    How heavy will it be?

    Rick W.
     
  10. hydrofoil14
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    hydrofoil14 New Member

    it only needs to carry 1 person, and is specifically for high speed, so im aiming for 40+knots if possible. i was planning to power it with a small diesel engine and a propeller. most of my designs are surface piercing type hydrofoils to keep it stable, but all of these are still just sketches atm.

    not to sure about weight yet, until i figure out what and how im going to build the hull from.
     
  11. Guest625101138

    Guest625101138 Previous Member

    At those speeds it will have little or no advantage in power over a planing hull. I guess it will give a smoother ride in rough water providing it rides high enough.

    You will need a planing hull to get you up to the lift-off speed. Once flying the hull is only fairing around the structure that supports the foils.

    The lift/drag ratio for the foils at 40kts will be less than 20 and hopefully more than 10. So the total weight will be the main factor in the design of the structure that support the foils.

    Rick W
     

  12. Gannet
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    Gannet Junior Member

    Attached Files:

    Last edited: Mar 6, 2008
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