CEFOSKEY,
I've done some traditional back of envelope calcs to convince myself that scaling up X2 technology is feasible (i did waver earlier in the thread). As the rotor diam goes up 1st flap and torsion frequencies linearly reduce, but so does NR (for constant tip speed). So any offset hinge achievable with X2 would also apply to the scaled up machine. The technology is scalable.
Interesting to see whether faster point-to-point passenger service becomes a driver for the technology...