regarding definitions
The post above quotes the FAI as follows;
HELICOPTER: A rotorcraft with a power driven rotor system whose axis (axes) is (are) fixed and substantially perpendicular to the longitudinal axis of the rotorcraft (my underlining)
by defintion this means the X2 isnt a helicopter but more correctly a
ROTORCRAFT - An aerodyne that derives the whole or a substantial part of its lift from a rotary wing system
or am I reading it wrong?
I don't doubt the X2 may prove to be a fast machine, whether this technology can be upscaled to a useful rotorcraft remains to be seen rather than a one man whizz about. Ultimately I believe that the G-LYNX record will never be beaten by a conventional (non augmented) helicopter.
DM