Some comments:
The Gyrodyne was a wonderful attempt, but it was not far ahead of its time, as evidenced by the billions spent on helos and tiltrotors while ignoring it in the intervening decades.
Quite inefficient, noisy, costly and complex, with fairly poor hover capability, poor Cat A capability and moderately high speed is how it was judged by those who did not write its marketing hype.
Trust your free market, there is no carburettor that runs on water, no secret invention that pours electricity out of cats butts, and no rotorcraft as efficient as an airplane.
The data used by those who looked at and bypassed the Gyrodyne is quite good data, as the aircraft was a truly remarkable proof of concept machine. Nothing beats real flight data, folks!
That is the thanks I have for Dave's comments on the Carter Copter. Carter is making another brave attempt that shows promise, but has a very long way to go before he should publish as if facts are at hand. A bunch of 'Shoulds" and "Mights" and "Shows promise ofs" are needed immediately in his marketing shop, if we can spare some.