Cost Estimate - Watson

Discussion in 'Boat Design' started by anaorsolini, Oct 3, 2008.

  1. anaorsolini
    Joined: Sep 2008
    Posts: 3
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: France

    anaorsolini New Member

    Hi,

    I have a spread sheet with Watson's method of cost prediction (from "Practical Ship Design" book) and I wanted to use it, but I was analysing it and the first formula I have (probably taken from a graph in the book) doesn't make any sense:

    Structure Cost = -590*58*log(Steel Weight)+7648.2

    This negative sign gives me a negative Structure Cost!

    Since the spreadsheet was made a long time ago and I don't have access to that book anymore, I don't remember how that formula is even possible!

    Is anyone familiar with Watson's theory or could anyone suggest me another good cost estimate method?

    Thank you!
     
    anaorsolini, Oct 3, 2008
    #1
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