True. As mentioned above, only the XV-1 (a compound autogyro) had 'tip jets.' The XV-3 tiltrotor had a 450shp radial engine mounted in the center fuselage connected to the two fully-articulated three-bladed proprotors (originally). Later the proprotors were changed to two-bladed semi-rigid systems due to a 'flutter' problem found with the three-bladed proprotors. The rotor rigidity also helped to resist gyroscopic effects during transition.
Last edited by 21st Century; 29th Mar 2007 at 06:46.