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Sopwith Pup

The Sopwith Pup is a British single-seater biplane fighter aircraft built by the Sopwith Aviation Company. It entered service with the Royal Naval Air Service and the Royal Flying Corps in the autumn of 1916. With pleasant flying characteristics and good manoeuvrability, the aircraft proved very successful. Newer German fighters eventually outclassed the Pup, though it remained on the Western Front until late 1917. The remaining Pups were relegated to Home Defence and training units. The Pup's docile flying characteristics also made it ideal for use in aircraft carrier deck landing and takeoff experiments and training.

In 1915, Sopwith produced a small aircraft, known as "Hawker's Runabout" (or the SL.T.B.P), for the company's test pilot Harry Hawker. It was a single-seat, tractor biplane powered by a seven-cylinder 50 hp (37 kW) Gnome rotary engine. Another four similar aircraft have been tentatively identified as Sopwith Sparrows. Sopwith next developed a more powerful aircraft as a fighter that was heavily influenced by this design, although controlled laterally with ailerons rather than by wing warping.

The resulting aircraft was a single-bay, single-seat biplane with a fabric-covered wooden framework and staggered equal-span wings. The cross-axle type main landing gear was supported by V-struts attached to the lower fuselage longerons. The prototype and most production Pups were powered by the 80 hp (60 kW) Le Rhône 9C rotary engine. The armament was a single 0.303 in (7.7 mm) Vickers machine gun synchronized with the Sopwith-Kauper synchronizer.

A prototype was completed in February 1916 and sent to Upavon for testing in late March. The Royal Naval Air Service (RNAS) quickly ordered two more prototypes, then placed a production order. Sopwith was heavily engaged in the production of the Sopwith 1½ Strutter, and produced only a small number of Pups for the RNAS. Deliveries commenced in August 1916.

The Royal Flying Corps (RFC) also placed large orders for Pups. The RFC orders were undertaken by sub-contractors Standard Motor Co. and Whitehead Aircraft. Deliveries did not commence until the beginning of 1917. 1,796 Pups were built, including 96 by Sopwith, 850 by Standard Motor Co., 820 by Whitehead Aircraft, and 30 by William Beardmore & Co.

In May 1916, the RNAS received its first Pups for operational trials with "A" Naval Squadron. The first Pups reached the Western Front in October 1916 with No. 8 Squadron RNAS, and proved successful, with the squadron's Pups claiming 20 enemy machines destroyed in operations over the Somme battlefield by the end of the year. The first RFC Squadron to re-equip with the Pup was No. 54 Squadron, which arrived in France in December. The Pup quickly proved its superiority over the early Fokker, Halberstadt and Albatros biplanes. After encountering the Pup in combat, Manfred von Richthofen said, "We saw at once that the enemy aeroplane was superior to ours."[citation needed]

The Pup's light weight and generous wing area gave it a good rate of climb. Agility was enhanced by having ailerons on both wings. The Pup had half the horsepower and armament of the German Albatros D.III, but was much more manoeuvrable, especially over 15,000 ft (4,600 m) due to its low wing loading. Ace James McCudden stated that "When it came to manoeuvring, the Sopwith [Pup] would turn twice to an Albatros' once ... it was a remarkably fine machine for general all-round flying. It was so extremely light and well surfaced that after a little practice one could almost land it on a tennis court."[citation needed] However, the Pup was also longitudinally unstable.

At the peak of its operational deployment, the Pup equipped only four RNAS squadrons (Nos. 3, 4, 8 and 9), and three RFC squadrons (Nos. 54, 46 and 66). By the spring of 1917, the Pup had been outclassed by the newest German fighters. The RNAS replaced their Pups, first with Sopwith Triplanes, and then with Sopwith Camels. The RFC soldiered on with Pups, despite increasing casualties, until it was possible to replace them with Camels in December 1917.

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First world war fighter aircraft
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