@John R81: Yes, conference papers summarizing restricted access technical reports are available. Design has constant RPM in heli mode, and reduction to 84% of hover RPM for airplane mode cruise. Proprotor twist is similar to V-22/XV-15, with slight vairiation at lower rotor to account for upper rotor's wake. See bottom of
http://www.baldwintechnology.com/deepdive.html for the documentation.