) writes:
I am happy to change it to whatever is best taking in to account that it
will mostly be a fun boat for the kids . The boat is not yet finished (only
a frame at the moment) The mast can be put where ever it needs to go and can
be built to suit the final mast/sail design...
The boat is 3.05m long and 1.05 wide at the water line
The waterline plane area is 2.59m2
Displacement is 0.103m3
Centre of displacement is X = 1.388m Y = 0.0m Z = 0.008m


guidelines are sail area is 2.2 times wetted surface and also has Bruce
number of 1.3 for small boats (under 25 ft). Bruce number is square root
of sail area divided by cubed root of displacement. all sail areas in
sqaure feet. displacement in pounds of water displaced. numbers will not
agree but give range of possible sail areas. TF jones gives rule of thumb
for small boats arond 300 lb displacement of 1/4 sq foot sail area per
pound of displacement.

once you determine area of sail you then must determine shape which will
then give height of mast. some different shapes: bermudan, sprit, lug,
gaff, lateen, etc.

place mast so center of effort of sail is over daggerboard or centreeboard
or leeboard whichever boat uses.


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