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Union Aircraft Co Rotorplane
Union Rotorplane NX772N
The 1931 Union Aircraft Co Rotorplane was designed by Isaac C Popper with four conical rotors in an open frame replaced the wings and were driven by two additional 28hp Indian (motorcycle) engines. An experiment based on the Magnus Effect to create lift.
Power was by a 90hp ACE (Cirrus).
The two-place aircraft was registered NX772N c/n M-1 and although the designer claimed it had double the lifting power of conventional wings and could land a half the speed, there is no record of actual flight.

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