There will always be a tip vortex. However, a longer foil with shorter chord
tapering to a more rounded or pointed end will create a smaller vortex with
less subsequent drag than a sail that is flat on the end like the ones shown
in the picture.

CN


"DSK" wrote in message .. .
Crapt. Neal® wrote:
... To go faster they need higher aspect ratio sails with a more rounded
top to
reduce drag caused by the tip vortex those flat-topped sails create.


So, a foil with a rounded or pointy tip doesn't cause a tip vortex?

Where's Jax when you need him?

DSK