The Bell XV-3 is an American tiltrotor aircraft developed by Bell Helicopter for a joint research program between the United States Air Force and the United States Army in order to explore convertipla
The second Bell XV-3 during flight testing (c.1959)
Bell XV-3 in a hover, 1955. This was first version with 3-blade rotors and crashed.
XV-3 test, in vertical flight with 2 blade rotors
The McDonnell XV-1 is an experimental Convertiplane developed by McDonnell Aircraft for a joint research program between the United States Air Force and the United States Army to explore technologies