Sail force coefficients

Similar to the wind tunnel, the major task in generating realistic sail coefficients is getting a good sail-trim over a range of apparent wind angles (AWA) and heeling moment (for depowering the rig). We have two ways of working around this problem. The client can provide us with either a database of sail trims to test, or a parent sail shape. From the parent sail shape we create many variants using either a parametric morphing approach or an optimization algorithm that trims and deforms the parent in a range of conditions.

Coefficients for a range of sailsets, sail-trim and conditions

CD/CL2 plot for an upwind sail-set, showing all points generated during the optimization