Originally Posted by
MechEngr
I've seen an estimate that the rotor turns at around 350 RPM; if that is wrong then the rest of this will be too, by whatever the proportion of error is in that number. That means that the rotor is turning at nearly 6 rotations per second, (350/60), so 1/6th of a second for a full rotation.
the nominal main rotor speed inflight ( 100 % ) appears to be 292rpm , not 350.
https://rgl.faa.gov/Regulatory_and_G...C?OpenDocument