Or 1082.675 ft/second.
If a rotor has 125' blades and say 2' from center to the base of the rotor, the circumference would be πD or 254π = 797.964 ft. So if the rotor made one revolution per second, the tip would be traveling at 798 FPS. (Subsonic)
If the rotor was 300' Dia. then the circumference is 942.477 ft. at 1 rev/sec. it would be subsonic at sea level, but probably as close as you want to get in practice.
Craig via Mercedes <mailto:mercedes@okiebenz.com> January 26, 2020 at 9:48 PM On Sun, 26 Jan 2020 18:09:25 -0900 Clay via Mercedes Remember, the speed of sound at sea level is 330 meters/second = 738 mph. I can figure out how far something with a starting velocity of, say, 500 mph would travel, but that will have to wait for now. Craig
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