Mart,
Here is some information on the X2 rotors.
The 2 interrelated patent applications are;
- 20060269418 ~ Rotor blade for a high speed rotary-wing aircraft
- 20070110582 ~ Rotor blade twist distribution for a high speed rotary-wing aircraft
The blade planform and the twist that they are using to optimize the Figure of Merit in hover and improve forward flight performance are intriguing.
In addition, the upper blades have a different twist from that of the lower blades. Because a coaxial is not bilaterally symmetrical they are attempting to compensate by making the two rotors vertically unsymmetrical. Time will tell if two wrongs make a right.
__________________
We were talking about disk loading and specifically the unevenness of the loading over the area of the disk,
on another thread.
The coaxial disk(s) on the drawing below is based on information in the above patents. Identical intermeshing and interleaving disks have been add for comparative purposes.
Dave