Cyclogyro

The cyclogyro, or cyclocopter, is an aircraft configuration that uses a horizontal-axis cyclorotor as a rotor wing to provide lift and, sometimes, also propulsion and control.

In principle, the cyclogyro is capable of vertical take off and landing and hovering performance, like a helicopter, while potentially benefiting from some of the advantages of a fixed-wing aircraft.

Blade pitch can be adjusted to change the thrust profile, allowing the cyclogyro to travel in any direction without the need for separate control surfaces.

[citation needed] Adolf Rohrbach of Germany designed a full VTOL version in 1933, which was later developed in the US and featured a tall streamlined fuselage to keep the wings clear of the ground.

[4][5] Another example was built by Rahn Aircraft in 1935, which used two large-chord rotary wings instead of a multi-blade wheel driven by a 240 hp supercharged Wright Whirlwind[6] The cyclogyro has been revisited in the twenty-first century, as a possible configuration for unmanned aerial vehicles.