de Groot method

Discussion in 'Boat Design' started by M.Raven, Jun 1, 2015.

  1. M.Raven
    Joined: May 2015
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Netherlands

    M.Raven New Member

    Hello,

    Does anybody have any information regarding the Groot method for resistance prediction in small boats?
    I want to use the Groot method equations for simple effective power prediction in small boats. I found the Groot graphs as a function of Froude number, residual resistance- displacement weight ratio, length displacement ratio but I need the single graph or a single formula for effective power prediction.
    Can anybody help me?
    Thank you.

    Cheers
     
    M.Raven, Jun 1, 2015
    #1
  2. DCockey
    Joined: Oct 2009
    Posts: 5,229
    Likes: 634, Points: 113, Legacy Rep: 1485
    Location: Midcoast Maine

    DCockey Senior Member

    DCockey, Jun 1, 2015
    #2
  3. M.Raven
    Joined: May 2015
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Netherlands

    M.Raven New Member

    Dear David,

    I have seen these posts before and the de Groot graph but I am looking only for one equation (one master curve) to use it in a spreadsheet for power prediction. I have seen the spread sheet distributed by Alik and he used a single equation for power prediction:
    Rr/gD==(0,02113*EXP(16,8*FnL)+2,267/L)/1000
    I do not know from where this formula comes from or how he converted all curves into this master curve/equation?
    I appreciate if you could help me.

    Best regards,
     
    M.Raven, Jun 1, 2015
    #3
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