The Cierva Autogiro Company was a British firm established in 1926 to develop the autogyro. The company was set up to further the designs of

Juan de la Cierva Juan de la Cierva y Codorníu, 1st Count of la Cierva (; 21 September 1895 in Murcia, Spain – 9 December 1936 in Croydon, United Kingdom) was a Spanish civil engineer, pilot and a self taught aeronautical engineer. His most famous accomplish ...

, a Spanish engineer and pilot, with the financial backing of James George Weir, a Scottish industrialist and aviator.

History

Juan de la Cierva's first British-built autogyro was the C.8 design. It and some other designs were built in conjunction with

Avro AVRO, short for Algemene Vereniging Radio Omroep ("General Association of Radio Broadcasting"), was a Dutch public broadcasting association operating within the framework of the Nederlandse Publieke Omroep system. It was the first public broad ...

. The pre-war

Cierva C.30 The Cierva C.30 is an autogyro designed by Juan de la Cierva and built under licence from the Cierva Autogiro Company by A V Roe & Co Ltd (Avro), Lioré-et-Olivier and Focke-Wulf. Design and development Before the experimental Cierva C.19 ...

proved popular. Nearly 150 were built under licence in the United Kingdom by

, in Germany by

Focke-Wulf Focke-Wulf Flugzeugbau AG () was a German manufacturer of civil and military aircraft before and during World War II. Many of the company's successful fighter aircraft designs were slight modifications of the Focke-Wulf Fw 190. It is one of the ...

, and in France by Lioré-et-Olivier. On 9 December 1936, Cierva was killed in the Croydon KLM airliner accident when the aircraft in which he was a passenger crashed after taking off in fog. Dr.

James Allan Jamieson Bennett James is a common English language surname and given name: *James (name), the typically masculine first name James * James (surname), various people with the last name James James or James City may also refer to: People * King James (disambiguat ...

was promoted to Chief Technical Officer of the company and remained in the position until leaving in 1939. In addition to making important contributions to autogyro controls while at Cierva Autogyro, Bennett carried through with Cierva's decision to offer the Royal Navy an aircraft capable of true vertical flight. Bennett's innovative design, a new type of rotorcraft that combined key features of the autogyro and helicopter, was tendered to the Air Ministry ( Specification S.22/38) as the Cierva C.41 Gyrodyne, but preliminary work was abandoned with the outbreak of World War II. Bennett joined Fairey Aviation in 1945, where he continued the development of the C.41 design to create the first gyrodyne, the Fairey FB-1, that first flew in 1947. In 1943, the Aircraft Department of G & J Weir Ltd. was reconstituted as the Cierva Autogiro Company to develop helicopter designs for the Air Ministry. The post-war Cierva Air Horse was at the time (1948) the world's largest helicopter. The first prototype of the Air Horse crashed killing Alan Marsh, Cierva's manager and chief test pilotMarsh had been with Cierva since 1932 and had been its instructor at the autogyro flying school. During World War II he had flown autogyros for radar development John "Jeep" Cable,Cable had learnt to fly under Marsh and had been a Cierva employee before world War II. During World War II, he had been commanding officer of the Research, Development and Training Unit for Rotary-Wing Aircraft.

Ministry of Supply The Ministry of Supply (MoS) was a department of the UK government formed in 1939 to co-ordinate the supply of equipment to all three British armed forces, headed by the Minister of Supply. A separate ministry, however, was responsible for aircr ...

Chief Helicopter Test Pilot, and J. K. Unsworth the Flight Engineer. This led Weir to cease further investment in the company and its development contracts were transferred to Saunders-Roe.

Aircraft

Cierva C.1 The Cierva C.1 was an experimental autogyro built by Juan de la Cierva in Spain in 1920, the forerunner of his successful series of autogyros. The C.1 was created by taking the fuselage from a Deperdussin fixed-wing aircraft and mounting two ro ...

* Cierva C.2 *

Cierva C.3 __NOTOC__ The Cierva C.3 was an experimental autogyro built by Juan de la Cierva in Spain in 1921. 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-b ...

* Cierva C.4 *

Cierva C.5 __NOTOC__ The Cierva C.4 was an experimental autogiro built by Juan de la Cierva in Spain in 1922 which early the following year became the first autogyro to fly successfully. Failures of De la Cierva's attempts to compensate for dissymmetry of l ...

* Cierva C.6

British-built aircraft

Cierva C.8 The Cierva C.8 was an experimental autogyro built by Juan de la Cierva in England in 1926 in association with Avro. Like Cierva's earlier autogyros, the C.8s were based on existing fixed-wing aircraft fuselages – in this case, the Avro 552. ...

Cierva C.9 __NOTOC__ The Cierva C.9 was an experimental autogyro built by Cierva in England in 1927, in association with Avro AVRO, short for Algemene Vereniging Radio Omroep ("General Association of Radio Broadcasting"), was a Dutch public broadcas ...

* Cierva C.10 * Cierva C.12 (first flight 1929) - first autogyro with floats *Cierva C.13 - flying boat autogiro (project only) *Cierva C.14 * Cierva C.17 * Cierva C.19 * Cierva C.20 Focke-Wulf licence-built version of C.19 * Cierva C.21 Lioré et Olivier licence-built version of C.19 (not built) *

Cierva C.24 The de Havilland C.24 was a two-seat autogyro built by de Havilland at its Stag Lane works in England in 1931 Design and development The C.24 was built in 1931 using a Cierva rotor head coupled to the cabin of a de Havilland DH.80A Puss Moth ...

*Cierva C.25 *Cierva C.26 - twin-engine autogiro (project only); designation re-used for modified C.24 *

Cierva C.29 __NOTOC__ The Cierva C.29 was a five-seat British cabin autogyro built in 1934 as a joint venture between Westland Aircraft and Cierva. The rotor system and rotors were designed by Cierva and the fuselage by Westland. It was powered by a Armst ...

*Cierva C.32 - two-seat coupe autogiro (project only) *Cierva C.33 - four seat autogiro based on the Avro Type 641 Commodore (project only) *Cierva C.37 - twin engine, twin boom autogiro with 45-foot diameter rotor (project only) *Cierva C.38 *Cierva C.39 - two or three fleet spotter autogiro (project only) *

Cierva C.40 The Cierva C.40 was a British autogyro designed by G.B.L. Ellis, Otto Reder, and Dr. J.A.J Bennett and was assembled by the British Aircraft Manufacturing Company at London Air Park, Hanworth. Development The C.40 was the last autogiro pro ...

Weir W.1 - W.4 A weir or low head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. Weirs are also used to control the flow of water for outlets of l ...

- Four prototypes of single-place autogiro. Abandoned when development of W.5 helicopter commenced. *

Weir W.5 A weir or low head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. Weirs are also used to control the flow of water for outlets of l ...

(first flight 1938) - 2-seater twin (outrigger) rotor helicopter with wooden frame; engine was a 50 hp 4-cylinder air-cooled Weir *

Weir W.6 A weir or low head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. Weirs are also used to control the flow of water for outlets of l ...

(first flight 1939) - twin rotor helicopter, 200 hp de Havilland Gipsy, metal tube frame *

Cierva W.9 The Cierva W.9 was a British 1940s experimental helicopter with a three-blade tilting-hub controlled main rotor, and torque compensation achieved using a jet of air discharged from the rear port side of the fuselage. Development In 1943, primar ...

(first flight 1945) - experimental helicopter to E.16/43, used shaft-driven hydraulically-actuated tilting hub for rotor control, and blown air for torque control and direction, one built *

Cierva W.11 Air Horse The Cierva W.11 Air Horse was a helicopter developed by the Cierva Autogiro Company in the United Kingdom during the mid-1940s. The largest helicopter in the world at the time of its debut, the Air Horse was unusual for using three rotors mounted ...

(first flight 1948) - heavy lift helicopter development of W.6 design, two built *

Cierva CR Twin The Cierva CR Twin (originally designated CR LTH.1 and also known as the Grasshopper III) was a five-seat utility helicopter that first flew in the UK in 1969. It was a joint development between Cierva Autogiro Company and Rotorcraft now a subs ...

*Cierva W.14 Skeeter (first flight 1948) - from 1951 the Saunders-Roe Skeeter

Notes and references

;Notes ;Citations ;Bibliography
CIERVA AUTOGIRO Co., Ltd
''Flight'' DECEMBER 9, 1926 p810 {{Authority control Technology companies established in 1926 Defunct aircraft manufacturers of the United Kingdom Defunct helicopter manufacturers of the United Kingdom 1926 establishments in England Technology companies disestablished in 1948 Vehicle manufacturing companies established in 1926 Vehicle manufacturing companies disestablished in 1948 1948 disestablishments in England British companies disestablished in 1948 British companies established in 1926