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| Sopwith Dolphin | |
|---|---|
| Name | Sopwith Dolphin |
| Caption | Sopwith Dolphin replica at an airshow |
| Type | Single-seat fighter |
| Manufacturer | Sopwith Aviation Company |
| First flight | 1917 |
| Introduced | 1918 |
| Retired | 1920s |
| Primary user | Royal Flying Corps |
| More users | Royal Air Force |
Sopwith Dolphin The Sopwith Dolphin was a British single-seat fighter aircraft produced by the Sopwith Aviation Company during World War I. Designed to offer high-altitude performance and pilot visibility, it entered service with the Royal Flying Corps and later the Royal Air Force in 1918, seeing action during the final months of the Western Front campaigns such as the Spring Offensive and the Hundred Days Offensive. Pilots flying Dolphins included aces from units like No. 19 Squadron RFC and No. 79 Squadron RAF, and the type influenced later interwar developments at firms including Hawker Aircraft and companies founded by figures such as Thomas Sopwith.
The Dolphin emerged from competition within Sopwith between designs like the Sopwith Camel and experimental types such as the Sopwith Snipe and Sopwith Triplane. Chief designer Herbert Smith opted for an unusual negative wing stagger biplane layout to improve pilot visibility and optimize center of gravity for the inline Hispano-Suiza 8 engine family used by contemporary types including the S.E.5a and Vickers F.B.19. Early prototypes were evaluated alongside aircraft from Gloster Aircraft Company, Bristol Aeroplane Company, and Royal Aircraft Factory designs during trials at Hendon Aerodrome and Farnborough under the supervision of the Air Board and Admiralty test pilots. Structural choices reflected materials and methods familiar to firms such as Sunbeam (motor company)—wooden frames with spruce longerons, plywood decking, and fabric covering—while armament provisions paralleled installations on fighters like the Sopwith Baby and Sopwith Camel, integrating synchronized Vickers machine gun mountings and overwing Lewis guns in some conversions. The Dolphin's Hispano-Suiza mounting required integration of cooling and cowling innovations similar to developments at Armstrong Whitworth and Beardmore facilities, and prototype evaluations involved pilots who also tested aircraft at Saint-Omer and Upavon.
Operational deployment began with squadrons transferred from the Royal Flying Corps to the newly formed Royal Air Force in April 1918, with Dolphins flying patrols over sectors including Ypres Salient, the Somme and supporting Canadian Corps and Australian and New Zealand Army Corps operations. Notable Dolphin-equipped units included No. 19 Squadron RFC, No. 87 Squadron RAF, No. 156 Squadron RAF, and No. 23 Squadron RAF, with aces such as James McCudden, Harold A. Hamersley, and William Rhodes-Moorhouse scoring victories in varied combat against German types like the Fokker D.VII, Albatros D.Va, and Pflicht D.III. Dolphins performed escort, ground-attack, and high-altitude interception roles during engagements tied to the German Spring Offensive and later coordinated strikes supporting the Allied Hundred Days Offensive. Mechanical issues with the Hispano-Suiza engine paralleled reports from operators of S.E.5a squadrons, prompting logistical linkages with depots at Brampton, Stamfordham, and Henlow. Postwar, Dolphins were assigned to Home Defence duties and experimental units at RAF Martlesham Heath and Aldershot, and some airframes influenced training types flown at School of Technical Training establishments.
- Dolphin Mk I: Prototype and early production powered by the Hispano-Suiza 8B engine, armed with twin synchronized Vickers machine guns. - Dolphin Mk II: Improved production with strengthened fuselage and modified cowling similar to refinements used on Royal Aircraft Factory S.E.5 derivatives. - Dolphin Night Fighter: Field conversions fitted with flame-dampers and night-fighting instrumentation used by Home Defence units at stations such as RAF Biggin Hill and RAF Kenley. - Civil and Test Conversions: Postwar conversions for trials by organizations including Ministry of Munitions contractors and private firms associated with Imperial Chemical Industries for demonstration and engine testing.
- Royal Flying Corps (operational emergence and transfer) - Royal Air Force (primary service operator) - Training and experimental flights at Royal Aircraft Establishment - Civilian contractors and private owners postwar associated with Royal Aero Club
No original Dolphins survive intact in museum collections, unlike contemporaries preserved at institutions such as the Imperial War Museum and the Royal Air Force Museum. Replicas and reproductions have been built by private groups and heritage organizations, appearing at airshows alongside reconstructed Sopwith Camel and Sopwith Pup examples. Reproduction efforts often collaborate with conservation specialists from institutions like the Science Museum and aviation history groups including the Great War Aviation Society and the Vintage Aviator Ltd.. Surviving components and drawings are held in archives at repositories such as the National Archives (UK), Fleet Air Arm Museum, and private collections tied to families of pilots like Albert Ball and Edward Mannock.
General characteristics - Crew: 1 (pilot associated with squadrons such as No. 19 Squadron RFC) - Length: approximately 20 ft 6 in—design comparable to Sopwith Snipe - Wingspan: approximately 31 ft—similar to contemporary Bristol Scout and Airco DH.5 dimensions - Powerplant: Hispano-Suiza 8B V8 inline engine, ~200–220 hp, paralleling installations in S.E.5a variants
Performance - Maximum speed: circa 125–130 mph—comparable with the Fokker D.VII top speeds - Service ceiling: high-altitude capability used in escort missions over Western Front sectors - Armament: twin synchronized Vickers machine guns; some aircraft carried overwing Lewis gun for experimental loadouts
Category:Royal Air Force aircraft Category:British World War I aircraft