Sopwith 1½ Strutter

Sopwith 1½ Strutter. The Sopwith 1½ Strutter was a pioneering British two-seat biplane designed by Herbert Smith for the Sopwith Aviation Company. It was the first British aircraft to enter service with a synchronized machine gun and the first to feature an effective defensive armament for the observer. Serving with the Royal Flying Corps and Royal Naval Air Service from 1916, it performed in roles ranging from fighter and bomber to reconnaissance, seeing extensive use with Allied air services.

Development and design

The aircraft was developed in late 1915, with its distinctive name derived from the unusual arrangement of its cabane struts, which appeared to be "one-and-a-half" pairs. The design team, led by Herbert Smith, incorporated several advanced features for its time. It was the first British operational aircraft to be fitted with a synchronized Vickers machine gun firing through the propeller arc, utilizing the Scarff ring-mounted Lewis gun for the observer. The airframe was a conventional wood and fabric biplane with ailerons on both wings, and it was powered by various engines, most commonly the 110 hp Clerget 9B rotary. Its design influenced subsequent Sopwith types, including the famous Sopwith Pup.

Operational history

The 1½ Strutter entered service in early 1916, initially with the Royal Naval Air Service for home defence and fleet reconnaissance. It saw its first major combat use with the Royal Flying Corps during the Battle of the Somme. While initially effective, it was soon outclassed by newer German fighters like the Albatros D.III, leading to high losses. The type was subsequently withdrawn from frontline fighter duties but continued as a bomber and reconnaissance aircraft. It saw extensive service with Allied nations, including France, Belgium, Russia, and the United States, with French-built examples being particularly numerous. Post-war, it served with various air arms, including those of Japan, Latvia, and South Africa.

Variants

Several key variants of the aircraft were produced. The main production types were the two-seat fighter/reconnaissance model and the single-seat bomber version, which carried a internal bomb load. The Sopwith Aviation Company built examples, but due to demand, significant licensed production was undertaken in France by companies like Société Anonyme des Établissements Nieuport. Other variants included a dedicated trainer and a shipboard aircraft for the Royal Naval Air Service, some equipped with flotation gear. Experimental versions tested different engines, such as the Hispano-Suiza 8, and armament configurations.

Operators

The primary military operators were the Royal Flying Corps and the Royal Naval Air Service. It was also widely used by the Aéronautique Militaire of France, which built and operated thousands. Other wartime operators included the Aviation Militaire Belge, the Imperial Russian Air Service, and the United States Army Air Service. Post-war, the aircraft was used by the air forces of Japan (Imperial Japanese Army Air Service), Poland (Polish Air Force), Latvia (Latvian Air Force), South Africa (South African Air Force), and Romania (Romanian Air Corps). Several were also used by civilian operators for survey and mail-carrying duties.

Specifications (1½ Strutter)

* **Crew:** 2 * **Length:** 25 ft 3 in (7.70 m) * **Wingspan:** 33 ft 6 in (10.21 m) * **Height:** 10 ft 3 in (3.12 m) * **Wing area:** 346 sq ft (32.1 m²) * **Empty weight:** 1,305 lb (592 kg) * **Gross weight:** 2,149 lb (975 kg) * **Powerplant:** 1 × Clerget 9B 9-cylinder air-cooled rotary piston engine, 130 hp (97 kW) * **Maximum speed:** 100 mph (160 km/h, 87 kn) * **Endurance:** 3.75 hours * **Service ceiling:** 15,500 ft (4,700 m) * **Armament:** 1 × forward-firing .303 in (7.7 mm) Vickers machine gun and 1 × .303 in Lewis gun on Scarff ring for observer * **Bombs:** Up to 130 lb (59 kg) for bomber variants

Category:1910s British fighter aircraft Category:Biplanes Category:Sopwith aircraft