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
