Crouch Constant

Discussion in 'Boat Design' started by Willallison, May 24, 2002.

  1. Timm
    Joined: Aug 2002
    Posts: 107
    Likes: 2, Points: 0, Legacy Rep: 64
    Location: Crystal River, FL USA

    Timm Senior Member

    Sorry Mike, I don't have a lot of sense (ie.. I actually try to make a living designing boats), but I do know a good deal when it comes along! I don't know much about programming, so I tend to write alot of spreadsheets for various and sundry things. I have wanted to write one for resistance myself, but have yet to find the time.

    MMD, I'll definitely post it if we can get it published. The publishing rights belong to Westlawn, so we have to work with them. They may be working with another publisher. We do have the rights for Common Sense of Yacht Design by L. Francis Herreshoff. Hopefully we'll get that one out next year. Used copies of that book sell for hundreds of dollars, so we should be able to sell a few thousand of them.
     
  2. Jimboat
    Joined: Feb 2002
    Posts: 248
    Likes: 15, Points: 18, Legacy Rep: 130
    Location: Canada

    Jimboat Senior Member

    Planing hulls

    Check out the design info in the Tunnel Boat Design book. It's not as simple as an easy formula for all planing hulls, but it is very accurate for high performance planing powerboats, particularly powercats and tunnel boats.

    Also have software that does the same thing (only faster).

    [​IMG]
     
  3. yipster
    Joined: Oct 2002
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    Location: netherlands

    yipster designer

    still got to get some of your books and software one of these day's jimboat.
    meanwhile in a quik search on the net i found this handy calculator

    a list of specs on various boats and C constants would indeed stil be very nice...
     
    Jimboat likes this.
  4. Jimboat
    Joined: Feb 2002
    Posts: 248
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    Location: Canada

    Jimboat Senior Member

    Sure!

    Yipster - thanks for good words. Call or email anytime to talk boat design, or check out STBD book or TBDP software. Happy to help anytime!
     
  5. sharpii2
    Joined: May 2004
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    Location: Michigan, USA

    sharpii2 Senior Member

    I think it would be very usefull to have 'C' constants for diferent bottom types. At least for the two most extreme, i.e. The flat at transom, 'variable deadrise' aka 'warped bottom', and the straight keeled deep 'V'd 'constant deadrise' aka 'deep 'V'. This would be useful and instructive for designer and client alike.

    The data on these two extremes could be used to bracket a proposed designs hull type which will usually fall somewhere in between these two extremes.

    Data that would also be useful would be 'minimum hp per ton to plane' for each of these two exteme types.

    Bob
     

  6. jlm
    Joined: Dec 2020
    Posts: 1
    Likes: 0, Points: 1
    Location: Europe

    jlm New Member

    Geocities is no more. It took me a while to track down where to find an archive of this site, so here it is to save others some time:
    speedcalc http://www.oocities.org/howardstephenson/speedcalc.html
     
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