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35 Degrees AWA
180 Degrees AWA
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Triangles
make very inefficient airfoils. Elliptical shapes reduce
the energy robbing tip vortices. This is why airplane
wings, propellers and even keels are always elliptical
rather than triangular in form. It is also why high
roach mains are so much more efficient than mains with
little or no roach. The same is true for headsails. As a
result, the racing rules limit or prohibit it.
When sailing hard on the wind the jib and main
work almost as one, and thus the combined elliptical
profile determines the aerodynamic efficiency. When
eased off, or reaching, the sails act more independently
and the geometry of each is critical to performance.
The sail designers at Doyle have developed shaping
techniques that support critical roach area in headsails
without the need for battens so you can enjoy the
efficiency of an elliptical form and have a sail that
can be easily furled!
Thus, not only does the Doyle UPS provide more area for
light air and for off the wind sailing it provides much
greater efficiency! |
