Stiff blades
I am still trying to figure out if the Hummingbird has an "absolutely rigid" rotor as Dave would say. Or does it have a hub flexbeam.
There is mention of a flexbeam in the patent. But why have a stiff blade and flexable hub? The patent also says the rotor works from 0 to full rpm. That would suggest an absolutely rigid rotor.
This is of interest to me as I am looking at the idea of an absolutely rigid rotor, a slow rotor that does not have much centrifugal force.