The Cierva Autogiro Company was a British firm established in 1926 to develop the

autogyro An autogyro (from Greek and , "self-turning"), also known as a ''gyroplane'', is a type of rotorcraft that uses an unpowered rotor in free autorotation to develop lift. Forward thrust is provided independently, by an engine-driven propeller. Whi ...

. The company was set up to further the designs of Juan de la Cierva, a Spanish engineer and pilot, with the financial backing of

James George Weir Air Commodore James George Weir, (23 May 1887 – 7 November 1973) was an early Scottish aviator and airman. He was a successful industrialist who financed Juan de la Cierva's development of the autogiro. Biography Weir was born in Cambuslang, ...

, 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. The pre-war Cierva C.30 proved popular. Nearly 150 were built under licence in the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the European mainland, continental mainland. It comprises England, Scotlan ...

by Avro, in

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

by Focke-Wulf, and in

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of overseas regions and territories in the Americas and the Atlantic, Pacific and Indian Oceans. Its metropolitan area ...

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 (disambiguati ...

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 The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against ...

an aircraft capable of true vertical flight. Bennett's innovative design, a new type of

rotorcraft A rotorcraft or rotary-wing aircraft is a heavier-than-air aircraft with rotary wings or rotor blades, which generate lift by rotating around a vertical mast. Several rotor blades mounted on a single mast are referred to as a rotor. The Internat ...

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 World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...

. Bennett joined

Fairey Aviation The Fairey Aviation Company Limited was a British aircraft manufacturer of the first half of the 20th century based in Hayes in Middlesex and Heaton Chapel and RAF Ringway in Cheshire. Notable for the design of a number of important military a ...

in 1945, where he continued the development of the C.41 design to create the first

gyrodyne A gyrodyne is a type of VTOL aircraft with a helicopter rotor-like system that is driven by its engine for takeoff and landing only, and includes one or more conventional propeller or jet engines to provide forward thrust during cruising flig ...

, 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 Air Ministry was a department of the Government of the United Kingdom with the responsibility of managing the affairs of the Royal Air Force, that existed from 1918 to 1964. It was under the political authority of the Secretary of State ...

. The post-war

Cierva 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 mount ...

was at the time (1948) the world's largest helicopter. The first prototype of the Air Horse crashed killing

Alan Marsh Henry Alan Marsh Air Force Cross (United Kingdom), AFC Royal Aeronautical Society, AFRAeS (29 January 1901 – 13 June 1950) was a British rotorcraft instructor and test pilot. Early life Alan Marsh was born in Stratton, Dorset. In 1917, he comp ...

, Cierva's manager and chief test pilotMarsh had been with Cierva since 1932 and had been its instructor at the autogyro flying school. During

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 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 Saunders-Roe Limited, also known as Saro, was a British aero- and marine-engineering company based at Columbine Works, East Cowes, Isle of Wight. History The name was adopted in 1929 after Alliott Verdon Roe (see Avro) and John Lord took a c ...

Aircraft

* Cierva C.1 *

Cierva C.2 __NOTOC__ The Cierva C.2 was an experimental autogyro built by 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 ...

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 __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.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 The Cierva C.6 was the sixth autogyro designed by engineer Juan de la Cierva, and the first one to travel a "major" distance. Juan de la Cierva, 1st Count of la Cierva, Cierva, the engineer responsible for the invention of the autogyro, had spe ...

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 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, a Spanish engineer and pilot, with the financial backing of James George Weir, a Scotti ...

Cierva C.12 The Cierva C.12 was an experimental autogyro built by Cierva Autogiro Company in England in 1929, in association with Avro. Development Like most other Cierva designs, it was based on an existing aircraft fuselage - in this case, an Avro Avian. ...

(first flight 1929) - first autogyro with floats *Cierva C.13 - flying boat autogiro (project only) *Cierva C.14 *

Cierva C.17 The Cierva C.17 was a British experimental autogyro built by Cierva Autogiro Company in England in 1928, in association with Avro (which designated it their Type 612). It was an attempt to build upon the successful Cierva C.8 design using the ...

Cierva C.19 The Cierva C.19 was a 1930s British two-seat autogyro, designed by Spanish engineer Juan de la Cierva. It was built by Avro as the Avro Type 620. It proved to be the most successful and widely produced of the early de la Cierva designs. Develo ...

* 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 * Cierva C.30 *Cierva C.32 - two-seat coupe autogiro (project only) *Cierva C.33 - four seat autogiro based on the

Avro Type 641 Commodore 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 broa ...

(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 *

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 (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 The de Havilland Gipsy is a British air-cooled four-cylinder in-line aircraft engine designed by Frank Halford in 1927 to replace the ADC Cirrus in the de Havilland DH.60 Moth light biplane. Initially developed as an upright 5 litre (3 ...

, metal tube frame * Cierva W.9 (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 Helicopter roto ...

(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 sub ...

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

Saunders-Roe Skeeter The Saunders-Roe Skeeter was a two-seat training and scout helicopter that was developed and produced by British manufacturer Saunders-Roe ("Saro") of Cowes and Southampton, in the United Kingdom. Work on what would become the Skeeter had bee ...

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