The C.6 at Cuatro Vientos in 1924. This autogiro, which used the fuselage of an Avro 504K, was produced by the Spanish Air Force workshops.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Avro C.6 - ВеликобританияUnited Kingdom - 1924

Frank T. Courtney in the C.6bis, Farnborough, October 1925.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Avro C.6 - ВеликобританияUnited Kingdom - 1924

The C.6bis during one English press demonstrations in October 1925.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Avro C.6 - ВеликобританияUnited Kingdom - 1924

A larger-diameter rotor was one of the distinguishing features of the C.6bis. Also visible are the “pegs” beneath the blades on which the starting rope was wound.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Avro C.6 - ВеликобританияUnited Kingdom - 1924

The C.12 over Cuatro Vientos in May 1929, piloted by Cierva himself.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Avro C.12 - ВеликобританияUnited Kingdom - 1929

The C.12 after a forced landing near Caceres in late July 1929, during Rambaud's return flight from Portugal. Note late type of tailplane.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Avro C.12 - ВеликобританияUnited Kingdom - 1929

The C.12 demonstration, Getafe, May 1929.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Avro C.12 - ВеликобританияUnited Kingdom - 1929

The C.4 was powered by an 80 h.p. Le Rhone rotary and was based upon the shortened fuselage of a Sommer monoplane.

Самолёты на фотографии: Aircrafts on the photo: Cierva C.4 / C.5 - ИспанияSpain - 1923

The C.4 at Getafe aerodrome, Madrid, in 1922. The rotor blades had a hinge which allowed them to “flap.”

Самолёты на фотографии: Aircrafts on the photo: Cierva C.4 / C.5 - ИспанияSpain - 1923

The C.5 at Cuatro Vientos aerodrome, Madrid, in 1923. It utilised the fuselage of the earlier C.2, having a 110 h.p. Le Rhone as its powerplant.

Самолёты на фотографии: Aircrafts on the photo: Cierva C.4 / C.5 - ИспанияSpain - 1923

Pilot A. Spencer lounges on the fuselage of the short-lived C.5, which ended its life in a crash in July 1923.

Самолёты на фотографии: Aircrafts on the photo: Cierva C.4 / C.5 - ИспанияSpain - 1923

In its final form, with a locked rotor head and ailerons on outrigger spars, it made the first successful autogiro flight on January 17, 1923.
A rebuilt machine, shown in Fig. 5, was provided with two small non-lifting ailerons carried on streamlined spars, the windmill axis being rigidly fixed. The machine shown in Fig. 5 made several successful flights, the first being made on January 31, 1923, and being of four minutes duration.

Самолёты на фотографии: Aircrafts on the photo: Cierva C.4 / C.5 - ИспанияSpain - 1923

The first official demonstration of an autogiro took place at Getafe aerodrome on January 22, 1923, the C.4 being flown by Lt Alejandro Gomez Spencer.

Самолёты на фотографии: Aircrafts on the photo: Cierva C.4 / C.5 - ИспанияSpain - 1923

The Loring-built C.7 at the 1926 Madrid Aeronautical Exhibition.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Loring C.7 - ИспанияSpain - 1926

The C.7 at Loring's airfield near Madrid in June 1927.

Самолёты на фотографии: Aircrafts on the photo: Cierva/Loring C.7 - ИспанияSpain - 1926