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Pcdefender said..
With the woman being much lighter the top end speed when using a foil seems to be no faster or even a touch slower in the stronger winds.
I am thinking with fin windsurfing technique is a greater factor than foil windsurfing when it comes to speed.
This is also my personal experience sailing with foilers - the bigger guys seem to go 3 to 4 knots faster than the smaller guys.
With fin sailing usually a knot or so is all that separates one good sailor from another regardless of weight.
There are a few things that can distort this image. Weight can be an advantage for speed, but there are plenty of exceptions to this rule -Sebastian Kornum and PD are just 2 examples.
The bigger difference you see for foilers may be partly due to wing choices. A heavier foiler on the same foil needs more lift, so he'll go faster (angle adjustments like shims are an alternative option, but they have their limitations). Outside of high-level racing where sailors can choose wing sizes, few foilers are really pushing the limits. Nico Goyard was able to pass Soe at will, despite probably being 15 kg lighter - but he had small foils specifically developed for him.
For women's speeds, keep in mind that Sarah-Quita is one of the tallest and heavier sailors, with crazy skills when it comes to turns. She was the only one who was able to beat the fins most of the time; if you ignore her, fin speeds and foils speeds were much closer, perhaps similar to where men were a year or two ago.