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• May 1, 2013
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Dave

Thanks for the input.
I used Jim's method to determine where the CE should be before starting the sail. I had changed David Beede's original layout so determining the geometry or mast, sail, foil had to be done from scratch. There is a diagram I made on the WB thread mentioned earlier.

I hadn't thought about taking a tape measure to the actual sail itself and verifying it's CE. I'll do that before I start the Mayfly. First of all I need to remodel the SB back to David's original layout - my changes were unwise (and contrary to David's advice) but it's been a highly educational project and I feel much better equipped to take on the next one.

Simon.

--- In Michalak@yahoogroups.com, "PolySail_Dave" <polysail@...> wrote:
>
>
> Oops! Correction needed, Simon. I misread the area of your sail as 60
> sq. ft. rather than 69 sq. ft. I know the Bolger sail well, but I don't
> know the dimensions of your sail. The position of the CE on your sail
> will need to be calculated. The CE is probably a little further back and
> a little higher than the figures I gave you for the smaller sail.
> However, the CE calculation is easily done using the method I mentioned,
> and it's always a good idea before doing a conversion.
>
> Dave
>
>
> --- In Michalak@yahoogroups.com, "PolySail_Dave" wrote:
> >
> >
> > Simon,
> >
> > I just sent out a sail to Gene Berry who is also converting his Mayfly
> > to a 60 sq. ft. leg o' mutton (Bolger's name for this sharpie sail.)
> > Just for your information, the CE of that sail normally falls at about
> > 35"-36" back of the luff and about 47"-48" up perpendicular from the
> > foot. However, it's always best to check the CE directly on the sail
> > using Jim's method. I do it with three 1" wide straight tape measures
> > from the corners to the midpoints of the opposite sides. You might
> have
> > to adjust the mast or leeboard position for best handling if you go
> > forward with this conversion. Gene assured me that he could simply
> > adjust the rake of his mast to bring the CE into the right position.
> > Maybe you can do the same. You want the CE about 2"-3" aft of the
> > centerline of the board for slight weather helm and best handling.
> >
> > Dave
> >
> >
> > --- In Michalak@yahoogroups.com, "simonfbroad" wrote:
> > >
> > > Nels
> > >
> > > Found a couple of photos of the finished product.
> > http://woodenboatblog.com/blog/2463
> > >
> > >
> > > Doesn't have quite the polished professional look of one of Poly
> > Dave's fine productions, but it was a hell of a lot of fun to make it
> > from scratch, and I learned a lot about sails doing it.
> > >
> > > Although only 69 square feet, I'm thinking to put it on my Mayfly 16
> > (when I get to build it) so that it is underpowered and I can learn to
> > use her gently, and without messing about reefing. Does that sound
> > feasible?
> > >
> > > Simon.
> > >
> >
>
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