Bill,

I have some questions on slip angles going to WINDWARD, and ballpark numbers are good enough, for as they say 'government work'. What kind of relative numerical difference between board vs boardless?


For say SC20 catamaran (which I have had the pleasure to sail on):


Is slip angle more practical as a design tool, than for practicing by yourself to improve VMG?

The slower you go the higher the slip angle, and the converse, the faster you go the slip angle approaches zero to the same true wind angle?

Going to windward, what angle to the true wind will the slip angle begin to zero out?
(mathematically never, but for practical use go to windward)

Is there a boat speed at which point the slip angle almost zero's out?

Did anything supprise you, while you were doing your research on SA?
ie. the rate of change of slip angle from 1kn to 10kn.

Using a slip angle you can determine the optimum amount of board to use for a given wind speed? and if so, any comments?

The higher a cat points into the wind the higher the SA? For practicing to improve VMG would you sail lower angles to the true wind until SA plateau's out? If so when does it plateau out?

Bill, should I buy North's SA meter-z1, or Elvstrom's SA A04-meter? (LOL)
Thanks again,
Chris