I think you have to consider total beam differences as the cb {center of Bouyancy } is the leeward hull and the lever arm is the beam measurement.

The masts centered being equal you have 9 inches to leeward and 9 to weather of added leverage .

In lighter winds {non trap}conditions the added beam or wings are a non factor.

1.5 extra beam * a 300 lb crew = 450 ft lbs of added leverage .

The hull weight needs to be factored in as well from the the 10 ft beam to the 8.5 beam {see previous post } .

That is 1.5 beam dif.* 100 lb hull = 150 ft lbs

A 300 LB crew needs to be out .5 further to compensate for hull weight of the 10 ft beam version or 300*.5 = 150 ft lbs

The total being 2 ft wings .

Think that's right. some can argue differently for valid reasons , but that's always part of measurement rating eqalizations.

I would like to see something like Rolf noted form into a new B class / Formula 20 class with room for experimentation and development , of course I have for the last decade or so . <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />