UNCTUOUS
PS: Your most recent posting was incorrect with reference to the XV-15 nacelle tilt angle range. The XV-15 does extend back to 95 degrees tilt. Both in the simulator and the XV-15 we used this 5 degree aft tilt to act as a giant 'air brake' for rapid deceleration. In addition, it's used as a brake while ground taxiing (you don't need to touch the wheel brakes), and it's also kind of fun ground taxiing backwards (make sure you have lots of open ramp space!!)