Supermarine Seal

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Role Reconnaissance flying boat
Manufacturer Supermarine
Designer Reginald Mitchell
First flight May 1921

The Supermarine Seal was a British amphibian biplane flying boat developed by the Supermarine company. The Seal was further developed into the Supermarine Seagull.

The Seal was designed to operate from either shore stations or warships, including the ability to land and take off from aircraft carriers.[1]

Design and development[edit]

The Seal was a two-bay biplane with the lower wing mounted on top of the fuselage and the engine mounted below the centre-section of the upper wing. The primary structure of the fuselage was roughly circular in cross-section and was built of planking over a framework of formers and stringers covered with fabric, with the planing surfaces built as separate structures, divided into watertight compartments.[2]

Specifications (Seal II)[edit]

Data from Supermarine Aircraft since 1914 [3]

General characteristics

  • Crew: three
  • Length: 32 ft 10 in (10 m)
  • Wingspan: 46 ft 0 in (14.02 m)
  • Height: 14 ft 10 in (4.52 m)
  • Wing area: 620 ft² (57.6 m²)
  • Empty weight: 4,100 lb (1,859 kg)
  • Loaded weight: 5,600 lb (2,540 kg)
  • Powerplant: 1 × Napier Lion 12-cylinder water-cooled W-block, 450 hp (336 kW)


  • Endurance: 4 hours
  • Climb to 10,000 ft (3,050 m): 17 min

See also[edit]

Related development

Related lists



  1. ^ "The Supermarine SEAL Mark II" FLIGHT, 3 November 1921, article with photos and line drawings
  2. ^ The Supermarine Seal IIFlight, 3 November 1921.
  3. ^ Andrews and Morgan 1987, p.81.


  • Andrews, C.F. and Morgan, E.B. Supermarine Aircraft Since 1914. London: Putnam Books Ltd., 2nd edition 1987. ISBN 0-85177-800-3.