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| 20 mm Hispano | |
|---|---|
| Name | 20 mm Hispano |
| Origin | Spain |
| Type | Autocannon |
| Service | 1938–present |
| Used by | Spain, United Kingdom, France, Germany, United States, Italy, Japan, Romania, Netherlands, Belgium, Switzerland |
| Wars | Spanish Civil War, World War II, Korean War, Algerian War, Suez Crisis, Falklands War |
| Designer | Sociedad Española de Construcciones Babcock & Wilcox, Vickers-Armstrongs, Société des Aéroplanes Bernard |
| Design date | 1930s |
| Manufacturer | Hispano-Suiza, De Havilland Aircraft Company, Royal Ordnance Factory, Oerlikon Contraves |
| Production date | 1938–1950s |
| Weight | 49 kg (gun only) |
| Length | 2.1 m |
| Cartridge | 20×110mm Hispano |
| Caliber | 20 mm |
| Action | Gas-operated, delayed blowback |
| Rate | 600 rpm (theoretical) |
| Velocity | 840 m/s |
| Feed | Belt-fed |
20 mm Hispano
The 20 mm Hispano was a family of autocannon designed in the 1930s and widely used by Spain, the United Kingdom, France, Germany, the United States, and other states during World War II and the early Cold War. Originating from the engineering heritage of Hispano-Suiza, the weapon influenced aircraft armament on types such as the Supermarine Spitfire, Hawker Hurricane, Messerschmitt Bf 109, De Havilland Mosquito, and Bristol Beaufighter. Its development intersected with major industrial actors like Vickers-Armstrongs, Royal Ordnance Factory, Oerlikon Contraves, and served in theaters from the Battle of Britain to the Korean War.
Design work began in the 1930s at Hispano-Suiza as part of modernization efforts tied to the Second Spanish Republic and later Francoist procurement during the Spanish Civil War. Engineers adapted mechanisms influenced by Ansaldo and Swiss Oerlikon designs while collaborating with British firms such as Vickers-Armstrongs and De Havilland Aircraft Company to meet requirements from air ministries in France, United Kingdom, and Italy. The layout favored a gas-operated, delayed blowback action to balance rate of fire demanded by Royal Air Force fighters and muzzle velocity expectations set by naval requirements from the Royal Navy. Licensing agreements and political pressures during the Munich Agreement era affected transnational production and technology transfer involving firms like Société des Aéroplanes Bernard and Sociedad Española de Construcciones Babcock & Wilcox.
The standard chambered round was the 20×110mm Hispano cartridge primed for armor-piercing and high-explosive roles similar to rounds used by Oerlikon systems and later NATO standardizations involving STANAG committees. Barrel length, recoil management, and gas ports were optimized for a muzzle velocity around 840 m/s, delivering effective ranges comparable to contemporaries mounted on aircraft such as the Focke-Wulf Fw 190 and Macchi C.202. Weight and dimensions allowed installation in wing bays, nose mounts, and turret installations on aircraft like the Bristol Beaufighter and Fairey Battle, while feed mechanisms supported synchronisation challenges encountered with propeller aircraft like Supermarine Seafire and Hawker Typhoon.
Variants included early Hispano-Suiza factory types, British-produced Mk.II and Mk.V adaptations by Vickers-Armstrongs and Royal Ordnance Factory, and later Swiss-influenced models adapted by Oerlikon Contraves. Specialized naval mountings were produced for HMS Prince of Wales-class fittings and escorts in the Royal Navy. Adaptations for fighters led to revisions for the Supermarine Spitfire Mk V, cannon-armed Gloster Meteor prototypes, and twin-mount installations in heavy fighters like the De Havilland Mosquito. Field modifications by units of the Free French Forces and Polish Air Forces in exile produced unique feed and cooling solutions to meet diverse combat environments such as the Western Desert Campaign.
Operational debut traces to the Spanish Civil War where early models saw action with Spanish Republican and Nationalist air arms. Extensive deployment in World War II equipped Royal Air Force fighters during the Battle of Britain and later in ground-attack roles in the Italian Campaign, Normandy landings, and the Burma Campaign. Postwar service extended into the Korean War with French Air Force and United States adapted platforms. Naval service included escorts in the Atlantic convoys and shore bombardment support during the Suez Crisis. Surviving examples persisted in reserve and training use in nations such as Argentina, Chile, and Portugal into the 1950s.
Production involved multi-national arrangements: original manufacturing by Hispano-Suiza in Spain, licensed builds by Vickers-Armstrongs and the Royal Ordnance Factory in the United Kingdom, and further production under subcontract in Switzerland and Italy. Wartime constraints prompted decentralization and subcontracting to firms including De Havilland Aircraft Company and smaller industrial concerns in France and Belgium. Industrial mobilization for World War II saw production scale alongside other ordnance such as the Vickers machine gun and Browning machine gun families, while postwar demilitarization affected output rhythms tied to Marshall Plan-era rearmament policies.
Ammunition types covered high-explosive incendiary, armor-piercing, and tracer projectiles compatible with 20×110mm Hispano chambers and closely related to rounds used by Oerlikon cannons. Ballistic performance made the weapon effective against lightly armored Panzer II-class vehicles and low-altitude aircraft, with engagement envelopes overlapping those of guns mounted on the P-51 Mustang and P-47 Thunderbolt when cannon-equipped. Logistical chains for ammunition supply involved ordnance depots of the Royal Army Ordnance Corps, United States Army Air Forces, and national arsenals such as Atelier de constructions de Rueil.
The Hispano family influenced postwar autocannon development in Europe and North America, informing designs produced by Oerlikon Contraves, Mauser Werke, and later NATO standardization efforts led by committees including NATO. Its integration lessons impacted aircraft such as the early jet Gloster Meteor and naval close-in weapon systems that evolved into defenses aboard HMS Sheffield-class and other Cold War-era platforms. Museums and collections in institutions like the Imperial War Museum, Musée de l'Armée, and National Air and Space Museum preserve examples, while surviving technical dossiers inform restoration projects undertaken by groups associated with Royal Air Force Museum and historic flight organizations.