The AC75 class confuses not only many observers with the conundrum of the two-legged stool, the multiple-fanged foil configuration is not easy for the scientists either. Dave Hollom illustrates some of the principal challenges, starting just below (and just above) the water
The recent AC75 article ‘Making sense of it’ by Andy Claughton (issue 483) was very interesting and he has highlighted one of the big performance problems confronting teams. To understand the problem a little more and possible solutions it might be worthwhile to look at the way induced drag varies with lift, speed, span and aspect ratios and how it relates to other drags.
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