The Cierva C.3 was an experimental autogyro built by Juan de la Cierva in Spain in 1921.
[citation needed] It was based on the fuselage of a Sommer monoplane, and was actually completed and tested before that aircraft.
The C.3 utilised a single, three-bladed rotor in place of the coaxial double rotor tested on the C.1.
A few short hops were achieved in testing and Cierva noted a tendency for the machine to want to roll over, thus alerting him to the problem of dissymmetry of lift that he would have to overcome in order to build a successful rotary-wing aircraft.
The C.3 was damaged and rebuilt four times before being abandoned without having flown, la Cierva returning to work on the C.2.