This view of the Northrop XB-35 Flying W 42-13603 on the ramp at Muroc Air Force Base shows the pusher arrangement of four-bladed contra-rotating propellers. In the background, a turbojet-powered YB-49 is in a right bank.. (U,S. Air Force)
Northrop XB-35 (S/N 42-13603), the first XB-35 with dual contra-rotating 3-blade propellers. (U.S. Air Force photo)