Flettner airplane

When the aircraft moves forward, the Magnus effect creates lift.

The Butler Ames Aerocycle was built in 1910 and tested aboard a warship.

[1][2] The Plymouth A-A-2004 was built for Zaparka in 1930 by three anonymous American inventors.

It was reported to have made successful flights over Long Island Sound.

[1][2] An inherent safety concern is that if power to the rotating drums were lost—even if thrust was maintained—the aircraft would lose its ability to generate lift as the drum slowed and it would not be able to sustain flight.