I imagine it will make an interesting exchange.  I thought I might as well start here though.  I'd like to draw a few more and consider the arguments first.  I imagine I'll throw it out there just after Christmas.  I need to have time to respond.  For instance, the angles of attack can be widened by drawing a slightly larger radius.  And although the foil performs well at narrow angles, in lighter conditions the Cp will be more negative for this foil when larger attack angles can utilised by the others.  Its all about compromise when it comes to producing the best foil. But I guess we can extrapolate from this modelling that a sharpened foil will be even more extreme.

• New Members 2