Finding the CE of a Square sail

I’d like to figure out what shape of sail for a Hoyt rig, but since the sail isn’t rectangular or square or triangular, you can’t just hold it by a corner and let gravity show you where the centrelines are.

I think Mr. Trewin could probably answer this easily, but some discussion could help all.


Hi tomoHawk,

the geometrical solution of the problem is very simple:


the C1 and C2 are the major and minor bases of trapezium.
The “asse geomentrico” (geometrical axis) is a line that goes between the medium point of C1 and C2

another example

Graphic method is very friendly


I’m sorry. I should have posted the shape of the sail panel to illustrate my idea.

try this, is free
function ‘baricentro’ in italian version