Here in Britain the F16's are starting to race regularly against the A's as a way of increasing the number of boats at regattas, at the last event it was a simple 1st boat over the line wins which worked pretty well, uninformed ( well sort of informed ) views are that the A's are quicker in winds up to about 10 knots and then the F16's are quicker in anything above that, the other good thing is that the people who race both classes are pretty like minded people and the apres sailing is a real blast ( far too many sore heads the next day ). This grouping does seem to work well.