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patronus said..
Saw a fin designer say drag from a foil goes as square of speed so foiling will never equal fin.
Hydrodynamic drag and lift go with the square of speed. That's the same for foils, fins, and wetted areas on windsurf boards, and therefore not a valid argument why "foiling will never equal fin".
Every place where windsurfers break 45 knots has
extremely flat water, and the same is true for places where windsurfers break 40 knots (which happens much more frequently). The runs are typically right next to a sandbank, or at places like Lake George or Albany where the weeds are extremely heavy, and usually in water shallower than 50 cm. For longer runs at deep downwind angles, very shallow water or heavy seaweed is an absolute must - otherwise, the rolling chop gets large enough to make top speeds impossible. These spots are simple not foilable. The one exception I know of where 50 knots have been done and foiling may be possible is West Kirby.
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patronus said..
Real world recreational sailors see differences too.
That's the interesting comparison. At our local spot on Cape Cod, the typical speed of recreational windsurfer on a typical day is below 20 knots. There are a couple of exceptions, but at least 80% of regulars rarely go above 22 knots, due to chop and just going back and forth. If the wind (and chop) picks up to 25+ knots, speeds go
down.
In my first 3 years of windfoiling, I was significantly slower than most windsurfers. Nowadays, that has changed: with typical travel speeds around 18 knots, and top speeds above 20 knots, I'm after going about the same speed as most windsurfers. Of course, this is spot dependent. Yesterday, I was at a (semi-)flat water spot, where plenty of guys reached 25 knots on windsurfers. But better windfoilers have shown that pushing the freeride foil gear I use to 25 knots is not that hard in flat water.
Foil racing shows a similar picture. For the first few years, fins beat foils in moderate conditions. But that difference is now largely gone, with foils often getting top speeds within a knot of fins in "real world" conditions, be it in Israel or Italy.
Winging is even more interesting with respect to speed. As wingers naturally progress towards higher aspect foils, recreational wing racing seems to becoming quite popular. On the wing forum, multiple wingers have reported speeds in the high 20s, which is on par with recreational speeds in semi-flat conditions. Given the rapid improvement in both wing gear and skills, speeds will certainly go up.
But while I like speedsurfing enough to tolerate a 35-hour flight to get to great speed spots, and love windfoiling, I think it's just a question of skill development until most of my sessions will be with wings. I was on windsurf, windfoil, and wing gear yesterday, and the winging ended up being most fun. After a dozen sessions on wing gear, it already feels easier to use in 25+ mph wind than windfoil gear after 200+ session.