Originally Posted by
SplineDrive
ET, understanding of coaxial rotors isn't as thin on the ground as you suggest... it's not a new configuration, there's wind tunnel data, aeroelastic modeling, subscale rotor testing, and of course flight data for several generations of ABC style aircraft. In addition to that, there is the experience of the Kamov, Hiller, and other designs that are to varying degrees, relavant... certainly more than single digit numbers of people are really conversant.
The design will manageably scale. It may or may not be the best fit to customer requirements, but that's partly what the JMR effort is for :-)
Honestly, I have no confidence that the designs will scale.
We don't really have a firm grasp even on conventional rotor systems engineering, else we have long since corrected the design flaws that led to the EC225 getting its certificate pulled for North Sea operations.
AFAIK, there are no 30,000 lbs GW ABC vehicles flying anywhere. What there is is much smaller and the development performance to date suggests strongly that the designs don't scale.