Fastest boat for given sail area

[Doug Lord]

The original speed sailing classes all limited sail area only-the boat could be as long and as wide as you wanted. Some boats within those classes have since placed limitations on beam and length(A Class Cat and C Class cat):

World Speed Sailing Records can be established in the following classes:

10 sq m (up to and including 10 sq m)
A Class (from 10 sq m up to and including 150 sq ft (13.93 sq m))
B Class (from 150 sq ft up to and including 235 sq ft (21.84 sq m))
C Class (from 235 sq ft up to and including 300 sq ft (27.88 sq m))
D Class (over 300 sq ft)

[Fanie]

Oh, and no windsurfers, no kiters, no superspecial that only work in very very specefic conditions like sail rocket, and no airborn boats, foil assisted is ok.

Ok so naturally aspirated sailboats... the foil assisted is semi-aspirated then