Fast but not that fast on a foil

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duzzi said..


ah ... math ... the arcane science! At 40 knots 10" are 205 meters.

Measuring speed across two gates is how is done in all the sports I can think of. Using a GPS device is mostly part of pleasure sailing, so if you like the extra speed you see over 2" go ahead. I rather have a 10" or 5x10" target.

Which is pretty well double the "even time" benchmark of that other sport. But Usain Bolt is only allowed 1 knot of wind assist. Wonder how fast he'd go in those new hi tech spikes and a 35 knot tailwind? 12.2 m/sec = 23.7 knots


www.quantamagazine.org/infinite-powers-usain-bolt-and-the-art-of-calculus-20190403/
" How fast did he run? Well, 100 meters in 9.69 seconds translates to 1009.69=10.32 meters per second. In more familiar units, that's about 37 kilometers per hour, or 23 miles per hour. But that was his average speed over the whole race. He went slower than that at the beginning and end and faster than that in the middle.More detailed information is available from his split times recorded every 10 meters down the track. He covered the first 10 meters in 1.83 seconds, corresponding to an average speed of 5.46 meters per second (12.2 miles per hour) there. His fastest splits occurred at 50 to 60 meters, 60 to 70 meters and 70 to 80 meters. He blazed through those 10-meter sections in 0.82 second each, for an average speed of 12.2 meters per second (27.3 miles per hour). In the final 10 meters, when he eased up and broke form, he decelerated to an average speed of 11.1 meters per second (24.8 miles per hour)."

12.2 m/sec = 23.7 knots

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duzzi said..

Measuring speed across two gates is how is done in all the sports I can think of. Using a GPS device is mostly part of pleasure sailing, so if you like the extra speed you see over 2" go ahead. I rather have a 10" or 5x10" target.

We use the GPS, because of the difficultly and resources required to set up gates on a speed course. In the GPS Team Challenge there are 6 disciplines measured for each session. They are 2 sec, 5 x 10 ave, hour, alpha 500, nautical mile and distance, so there is something for everyone. There are nearly 500 participants this year in the GPSTC. You can even join a team in the USA. There are many more participants in GPS sailing in GPSSS and KA72. If you don't measure and post it, it didn't happen.

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sailquik said..
This popped up on FB. How fast can the windsurfing record be raised and why. And same with Foiling speeds?

Use a translator on the web page to read as it is in French. Worth the effort as it is very interesting.

www.mauiultrafins.fr/quelle-vitesse-est-il-possible-datteindre-en-windsurf/?fbclid=IwAR1I8vAPJZTh61-LCxQFPIAhVR6rTw3k38DgAH0Vq-MJ8kFy7kyc-jsNQlE

Fred Haywood interview on WindsurfingTv is very interesting

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aeroegnr said..
Check out the body position here on a 37 knot run with 350 front wing:
www.instagram.com/p/CUxmFPKFzvO/?utm_medium=copy_link

Also, he goes deep into the jibe downwind before flipping the sail with his rear foot near the front strap. Looks like they said the 90 fuse on this run. He's way out in front trying to balance the foil lift on a small sail.

I think once he bears away and begins the gybe he needs to get his body forward to compensate for the loss of mast foot pressure. Super impressive.

I got into foiling so I could take advantage of our light wind summers, not really to set any speed records. Once the wind gets to 15-25 range I'd rather be windsurfing anyway.
My top 2sec foiling speed is 20.4 but mostly I hover around 18 with a Moses 1100 wing. To me though, foiling at 20 is as thrilling as 30 on a fin.