34855Re: [bolger] Re: "Lofting" side panels
- Mar 4, 2004Rather 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@...>
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!
> Bolger rules!!!
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