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34855Re: [bolger] Re: "Lofting" side panels

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  • John Bell
    Mar 4, 2004
    • 0 Attachment
      Rather than try to explain it, let me suggest you get a copy of Ian
      Oughtred's excellent book on lap ply construction.

      ----- Original Message -----
      From: "Bruce Hallman" <bruce@...>
      To: <bolger@yahoogroups.com>
      Sent: Thursday, March 04, 2004 10:43 AM
      Subject: Re: [bolger] Re: "Lofting" side panels


      > --- Peter Lenihan wrote:
      > > If the hull is round,
      > > then you have to figure out the"chain
      > > girth" at each station, divide this figure
      > > by the number of planks you intend on
      > > using to get the correct shape of each plank
      > > so that the finished boat does not have all its
      > > planks"frowning",ie;with> the seams curving
      > > downward,opposite to the sweep of the
      > > shearline.......
      >
      > This 'chain girth' question has always
      > confounded me, trying to figure out how
      > to loft a lapstrake or planked boat.
      >
      > Peter, is it as simple as 'divide by the
      > number of planks'? Because that calculation
      > only gives you the width of each plank at
      > each station. [Not the distance of each edge
      > of the plank from the center line of the plank
      > at each station.]
      >
      > In other words, it doesn't give you the
      > lengthwise curve of the plank, IE, is it
      > curved like a banana, and just how much?
      > Spiling, from one plank to the next,
      > I guess, gives that information.
      >
      > That is unless, and this is where I get
      > confused, it appears that the lengthwise
      > curve of the plank could be 'read' through
      > the lofting of the 'diagonals' in the lofting
      > diagram. But I never figured that out.
      >
      > Lofting the stations, halfbreaths and waterlines
      > makes sense to me, but lofting the diagonals
      > does not!
      >
      >
      >
      >
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