Dave, compared to V-22, X2 will have a lower disk loading so will require less power for a similar MAUW. My source:
http://en.wikipedia.org/wiki/V-22_Osprey
Disc loading: 20.9 lb/ft² @ 47,500 lb GW (102.23 kg/m²)
http://en.wikipedia.org/wiki/Sikorsky_X2
Disc loading: ? lb/ft² (kg/m²)
http://www.unicopter.com/1465.html#Calculation
Disk loading at GW: 6.2 lb/sq-ft - S69 spec quoted
Even accounting for errors and design difference in X2, the difference is disk loading is such that coaxial has to have better hover performance.
I'm confused, i thought you had a guestimate disk loading for X2 at some point?
CEFOSKEY, it a bold experiment indeed. Good luck to all involved!