Propeller design

Discussion in 'Props' started by skipper_rj, Apr 14, 2008.

  1. afrhydro
    Joined: Mar 2008
    Posts: 243
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    Location: port charlotte fl

    afrhydro Senior Member

    rick
    if i could figure out how to use the info you posted i would have a lot more info to go on
     
  2. Jimboat
    Joined: Feb 2002
    Posts: 255
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    Location: Canada

    Jimboat Senior Member

    afrhydro - Scott, i have emailed to you a copy of all 3 articles relating to the lift/drag/dynamic balance of hulls. Lift/Drags based on the principle of the Savitsky planing model. Dynamic balance outlined in the 3rd article. Call if you want to discuss more. This analysis is part of what the TBDP software does.
     
  3. afrhydro
    Joined: Mar 2008
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    Location: port charlotte fl

    afrhydro Senior Member

    cool
    going by the seat of paints so to speak for changes now
    seems very tricky
    i like the idea of making the after plane a small shallow tunnel hull slots
    it would seem to be the simplest solution to more speed and fuel consumption
    got to decrease hydro drag by half or close
     
  4. afrhydro
    Joined: Mar 2008
    Posts: 243
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    Location: port charlotte fl

    afrhydro Senior Member

    jim or rick
    look at this for me
    you will see the two little wedges in the photo
    those are gone
    now my question is to get more lift
    should i recess a 6 " x 1 1/2 x 8' tunnel slot up to the back of the sponsons or
    go the other way and make a shoe
     

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  5. afrhydro
    Joined: Mar 2008
    Posts: 243
    Likes: 12, Points: 0, Legacy Rep: 245
    Location: port charlotte fl

    afrhydro Senior Member

    jim as soon as i get my printer working ill fill out that form and fax it to you
     
  6. oceanmaster66
    Joined: Jan 2004
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    Location: New York

    oceanmaster66 Junior Member

    Jimboat,

    Do you know of any publication or research paper that describes an analytical method for finding the Dynamic C of G of a monohull?

    Thanks
     

  7. Jimboat
    Joined: Feb 2002
    Posts: 255
    Likes: 17, Points: 18, Legacy Rep: 130
    Location: Canada

    Jimboat Senior Member

    oceanmaster66 - the paper that i wrote on dynamic CofG was aimed at power catamarans & tunnel hull designs, but the methods are the same for monohulls. The key is to do the analysis throughout the velocity range, so that any dramatic changes in the DCofG are identified (such as the typical "Hump Zone" that higher speed planing hulls experience).

    Here's an article that I wrote that touches on methods for considering dynamic center of gravity (center of dynamic balance) for typical power catamarans.

    Drop me a line if you have any questions.
     
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