Higher Cp at higher speeds equates to less resistance?

Discussion in 'Hydrodynamics and Aerodynamics' started by dustman, Dec 1, 2020.

  1. Ad Hoc
    Joined: Oct 2008
    Posts: 7,047
    Likes: 975, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    The problem with theory, is:

    Exactly!

    Theory only gets you so far, and often, especially with hull design, is only applicable in theory and under extremely strict steady state conditions to obtain such "gains" or "benefits".
    In other words, great looking graphs, but no finsihed boat!

    If you want advice... draw the boat up...allocate space and weight to your design at at the correct scale... then and only then can you begin discussions on what is or is not possible to reduce drag on YOUR design, not some theoretical hull that is not your hull and not built.
     
  2. rxcomposite
    Joined: Jan 2005
    Posts: 2,349
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    Location: Philippines

    rxcomposite Senior Member

    Great, Then search Hydrodynamic Research by Leo Lazauskas, a member of this forum.

    So finally, it is a flea powered boat or something preferably pedal power, sail, or lawn mower engine. And could be a cat?

    Try this Kayak design parameters. https://www.boatdesign.net/threads/kayak-design-parameters.37739/page-3#post-458683
    or search Leo's work in Cyberiad OPTIMUM HULL SPACING OF A FAMILY OF MULTIHULLS E. O. Tuck and L. Lazauskas

    Try also Dolfiman, a member of this forum. He can optimize a hull form as easy mono or cat.

    By the way, the software is free.
     
  3. DogCavalry
    Joined: Sep 2019
    Posts: 1,568
    Likes: 838, Points: 113
    Location: Vancouver bc

    DogCavalry I aim to misbehave.

    Or follow my approach: bash bits of wood together with epoxy and saw off what you don't like, until it's a boat!
     
    Eric ruttan, BlueBell and Ad Hoc like this.

  4. Eric ruttan
    Joined: Jul 2018
    Posts: 190
    Likes: 28, Points: 28
    Location: usa

    Eric ruttan Senior Member

    Poor form old chap.

    If people follow this ridiculous idea what will all us blather on about!

    Won't you please think of the forums!
     
    BlueBell and DogCavalry like this.
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