ITTC Dictionary of Ship Hydrodynamics

Discussion in 'All Things Boats & Boating' started by daiquiri, Jul 14, 2011.

  1. daiquiri
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    daiquiri Engineering and Design

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  2. anhdtht
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    anhdtht Junior Member

    thanks very much !
     
  3. Ilan Voyager
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    Ilan Voyager Senior Member

    Thanks, very useful.
     
  4. Doug Lord
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    Doug Lord Flight Ready

  5. hoytedow
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    hoytedow Carbon Based Life Form

    Thanks!
     
  6. Landlubber
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    Landlubber Senior Member

    ....good one, ta. Well worth getting out of bed for.
     
  7. Leo Lazauskas
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    Leo Lazauskas Senior Member

    I see they avoided having a separate entry defining "Planing".
    What a cop out :p
     
  8. daiquiri
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    daiquiri Engineering and Design

    "Eagle Eye" Leo strikes again. :D
    I guess if they tried to include a definition of the term "planing" it would cause a havoc in the academic world. Where does semi-planing ends (or starts) and planing starts for a generic hull? Can anyone in the world give an unambiguous definition? :)

    But apart physically uncertain terms like this one, the dictionary has some other entries not well-defined. For example, the term "Volume displacement" appears in several definitions and formula but is not defined anywhere in the document, though defining it would be pretty much straightforward.

    Guess the dictionary will be integrated and expanded in the future (?)

    Cheers!
     
  9. Boat Design Net Moderator
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    Boat Design Net Moderator Moderator

    Adding a link to:
     
  10. Yos
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    Yos Student

    thanks
     
  11. Leo Lazauskas
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    Leo Lazauskas Senior Member

    I've started work on some planing problems, so I'll start the ball
    rolling with something from my erstwhile colleague, Ernie Tuck:

    "Planing is a state of steady motion of a boat in which the wetted draft
    is small compared to the wetted length and beam, and hydrodynamics, not
    hydrostatics provides the support for its weight."

    If we can accept this, or even better, refine it, I'll put it into the ITTC wiki.
     
  12. Ad Hoc
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    Ad Hoc Naval Architect

    The first part can be said of any boat, the latter not. So why not focus on the latter

    "A boat that is partially (the still water static draft has reduced when running) or wholly support by hydrodynamic forces rather than hydrostatic force".
     
  13. Leo Lazauskas
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    Leo Lazauskas Senior Member

    I need to think about it (and hear from others), but when planing, draft is definitely small compared to beam. That is not generally true of displacement hulls.
     
  14. Ad Hoc
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    Ad Hoc Naval Architect


  15. Leo Lazauskas
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    Leo Lazauskas Senior Member

    Typical pedantic NA :p

    Maybe I'd be more correct if we included something along the lines of "at high Froude numbers", if we could just agree on how high high is.
     
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