Armstrong Whitworth Atlas

Armstrong Whitworth Aircraft
Industry	Aerospace
Founder	John Lloyd (chief designer)
Headquarters	United Kingdom
Products	Aircraft (including Armstrong Whitworth Atlas)

The Armstrong Whitworth Atlas was a British-designed single-engine biplane developed and manufactured by Armstrong Whitworth Aircraft. It operated primarily as an army co-operation aircraft within the Royal Air Force (RAF) during the 1920s and 1930s. Notably, it was the RAF's first aircraft specifically created for the army co-operation role.

Development

File:Armstrong Whitworth Atlas of 208 Squadron RAF in Egypt, circa 1932.jpg

Armstrong Whitworth Atlas of 208 Squadron RAF in Egypt, circa 1932

Under the leadership of John Lloyd, chief designer at Armstrong Whitworth Aircraft, the Atlas emerged as a private venture aimed at replacing the DH.9A and Bristol Fighter in the RAF’s army co-operation capacity.^[1] Concurrently, a closely related model, the Armstrong Whitworth Ajax, was developed to fulfil more general-purpose duties.^[2] Although these were private projects, they aligned with Air Ministry specifications including Specification 8/24, 30/24, and 20/25.^[3]

The initial prototype of the Atlas (registration G-EBLK) first took to the skies on 10 May 1925 as a privately funded effort.^[4] It was subsequently submitted for testing at the Aeroplane and Armament Experimental Establishment (A & AEE) located at Martlesham Heath, where it was evaluated alongside competitors such as the Bristol Boarhound, de Havilland Hyena, Vickers Vespa, and Short Chamois. The Atlas outperformed these rivals in both handling and overall capabilities, leading to recommendations for its production.

Despite generally favourable performance metrics, the prototype exhibited limitations when attempting steep sideslips. This issue prompted a redesign featuring swept-back metal wings with an altered airfoil section. However, subsequent testing revealed that these modifications compromised handling qualities, introducing hazardous stall behaviour. Production orders had already been placed by this time, and early operational phases saw several accidents during takeoff and landing. These incidents were mitigated by retrofitting automatic leading-edge slats and increasing wing sweepback, which restored safe handling characteristics.^[5] The final production model incorporated a steel tube fuselage covered in fabric and utilized single-bay swept metal wings. Additionally, it featured an under-fuselage hook designed for message retrieval and could carry up to a 460 lb (210 kg) bombload beneath its wings.

Operational history

File:AW Atlas.jpg

Atlas retrieving a message

The initial order of 37 aircraft was placed in 1927, with deliveries commencing that year to 13 Squadron RAF and 26 Squadron. After resolving early handling issues by installing slats, the Atlas demonstrated strong suitability for army co-operation roles, serving both domestically and abroad. Notably, 208 Squadron became the first unit to operate Atlases outside the United Kingdom, replacing Bristol Fighters at Heliopolis, Egypt in 1930. Atlases were also employed in communications tasks and served as advanced trainers, with 175 dual-control variants produced. The aircraft remained active in army co-operation duties until the Hawker Audax, a derivative of the Hawker Hart, succeeded it; the final squadron operating the Atlas, 208, transitioned in 1935. The advanced trainer role was similarly taken over by the Hawker Hart Trainer in 1935.

In civil aviation, four Atlas trainers bearing civilian registrations were utilized by Air Service Training Ltd for advanced and reserve pilot instruction before being retired and scrapped in 1938.

The Royal Canadian Air Force received 16 Atlases in 1927, primarily assigned to No.2 (Army Co-operation) Squadron. These aircraft remained operational at the onset of World War II in 1939, adapting to maritime reconnaissance missions from bases at Halifax and Saint John, patrolling the Bay of Fundy. By late 1939, these planes were transferred to No.118 (Coast Artillery Co-operation) Squadron, which continued coastal patrols using this type until they were replaced by Westland Lysander and Blackburn Shark aircraft in 1940.

Variants

File:AWAries.jpg

Armstrong Whitworth Aries

File:Armstrong Whitworth Atlas II L'Aerophile July 1932.jpg

Armstrong Whitworth Atlas II from L'Aerophile July 1932

Atlas I – Army co-operation model; total of 271 units produced for the RAF.
Atlas Trainer – Dual-control training variant based on Atlas I; 175 built.
Atlas II – Enhanced version featuring aerodynamic refinements and powered by a 525 hp (391 kW) Armstrong Siddeley Panther engine. This model was rejected by the RAF in favor of the Audax but saw production of 15 units for the Kwangsi Air Force in China.
Ajax – Slightly modified version of Atlas I; four units constructed for the RAF.
Aries – Upgraded Atlas I with improved maintenance access and larger dimensions; only one built.
EAF Atlas – Cost-effective Greek variant differing mainly in wing structure, engine, and propeller; ten units manufactured by EAF (KEA) after 1931.