The original Rotodyne used a fixed rotor shaft. Due to the problems of routing the linkage around the air ducting etc. they located the swashplate in the dome housing above the rotors (see below). Because the Rotodyne took-off as a heli the rotor angle could be kept to an absolute minimum. If you want the angle I'll leave it up to you to calculate it from the dimensions show below.

Regards.

Karl.

Edit: Images uploaded.