Dave, as long as your AeroVantage uses only pivots, with no sliding mechanisms. Bushes are light and reliable, sliding mechanisms under load (at say 2g to allow some manouvreability) are heavy and prone to sticking as they become worn/notched. The high disc loading will still limit hover capability (failsafe), and i'm still not sure why try to keep both prop/rotors in the same streamtube (but only in one ideal flight condition).
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Good to see support for X2 is still out there. CEFOSKEY, thanks (again) for keeping us informed about this fascinating project.
I started this thread because i recognise that X2 (ABC) is a relatively simple solution for the high speed helicopter. There are (many) other solutions out there, and i wish all good luck. To me X2 remains the best compromise engineering solution....