Bill, on any forum like this one, if you ever try to "explain" principles of Hydrodynamics, aerodynamics, boundary layers, drag coefficients etc, you are going to get yourself into arguments. Most sailors seem, in my opinion, to want "instant" coroboration to their "assumptions" often made by "seat of the pants" so if you try to give any "technical" explaination, your an open target. If you just give them a "reference" where they can read the information themselves, they are satisfied, or at least they won't admit other than satisfaction, as that would show that they couldn't be bothered to look up the reference or that if they did they couldn't understand it or they read it and were enlightened. Which ever applies it has kept you out of the fireing line. Keep it simply, ie some one asks "whats your new design like" answer "real good mate" "no, WHATS it REALLY like" answer "realy, REALY good mate" "OH YOU MEAN that it's GOOD, well that's what I wanted to know!".