If you have a free rotating aerodynamically shaped mast, you can minimise the turbulence zones by a fair amount. But on a fixed mast, the turbulence behind the mast is significant. So much that you can say that the rotating must is the key enabler for performance of cats (don't tell the skiff community...)
Cheers,
Klaus
OK then in our low speed setups it would seem the soft sail maybe a winner due to simplicity and weight over aerodynamics. But what about a hybrid mast section of a D shape with two sail baulk rope guides and a twin section of soft sail leading to a single rear section from say half way back in depth. Over rotate the mast ever so slightly and the inner panel length is shortened allowing the inner panel to cdeepen slightly giving an assymetric shape. Has it been tried and are there any merits in the idea.
