There appears to be a burgeoning discussion regarding tiltrotor technology and the V-22 in particular. The attached monograph
provides a rather detailed history of tiltrotor technology and the V-22. With the selection of the Army V-280 Valor aircraft as the replacement for the H-60 Blackhawk, US military forces seem content on further embracing tiltrotor technology for the future.
Thus, I trust you will find the attached document
useful and interesting, regarding the discussion of tiltrotors and their military and civilian uses.
What is old is new again!
Frank Wickersham III