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The first terms in calculating RSAM and RSAF were to determine the areas of the main and foresail.  But RSAM had a .35 multiplier while RSAF had the .5 multiplier.  Since you use .5bh to find the area of a triangle, they simplified it by using .35 rather than .7 x .5 for the main and .5  rather...

Following a winning trend I suspect.  Or the designers felt the efficiency of such a rig more than compensated for the high rated sail area it incurred.  Or that MH rigs worked better for heavier boats Recalling what I can about how IOR rated sail area:  100% of the geometrical area of the...

I would guess she would have similar speed to a One Ton of that era - once the sheets were used. They would probably do a horizon job on her upwind and be faster DDW. But on a beam reach, I suspect Cascade may have been faster having basically two mainsails.

A common myth that simply was not true.  IOR actually favoured big low AR mains.  What you say about the mizzen was true however. Anyone who has played around with the IOR RSAT calculations will quickly realize how much it favoured big mains and smaller headsails.  At least with regards to...