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Inspired by the Curtiss H-4, the Norman Thompson N.T.4 had similar lines but integrated the glass-enclosed cabin directly into the hull structure. The initial batch was powered by a pair of 150hp Hispano-Suiza vee-eights, but later runs used the 200hp geared engines shared with the R.A.F. S.E.5a, and in this form it was re-designated the Norman Thompson N.T.4a.[3]

Norman Thompson N.T.4
Norman Thompson N.T.4.a., Norman Thompson Works, Bognor, February, 1918 Q63836.jpg
Role Flying Boat
Manufacturer Thompson
Designer Norman Thompson
Primary user RAF Type A Roundel.svg U.K. (RNAS)
Number built 30[1]
Wingspan 23.7 m (77 ft 10 in)[2]
Engine (NT4) 2×150hp Hispano-Suiza
(NT4a) 2×200hp Hispano-Suiza
Armament front flexible Lewis
2×100 kg (230 lb) bombs[1]
Crew 3 [2]
Max Speed 148 km/h (92 mph)[2] - 153 km/h (95 mph) [3] [note 1]
Climb 610 m (2,000 ft) in 3:50[3]
2,000 m (6,500 ft) in 15:00[3]-15:30[2]
3,000 m (10,000 ft) in 31:05[3][2]
Service Ceiling 3,600 m (11,700 ft) [3]

The plane had good performance and was used for both patrol and training, but it was overshadowed by the Curtiss H-12 and Felixstowe F.2A. [3]

Like the Curtiss H.4, the N.T.4 was nicknamed the Small America. Armament consisted of a Lewis gun on a Scarff ring and up to 210 kg (460 lb) of bombs. The Hispano engines were troublesome, though, and the planes were retired before the war's end.[1]

For more information, see Wikipedia:Norman Thompson N.T.4.


  1. With 200hp engines.
  1. 1.0 1.1 1.2 Nowarra, p.104.
  2. 2.0 2.1 2.2 2.3 2.4 Nowarra, pp.202-204.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Bruce'69, p.652.
  • J.M. Bruce. British Aeroplanes 1914-18. Great Britain, Funk & Wagnalls, 1957, 1969. ISBN 0370000382
  • Heinz J. Nowarra, Bruce Robertson, and Peter G. Cooksley. Marine Aircraft of the 1914-1918 War. Letchworth, Herts, England: Harleyford Publications Limited, 1966. ISBN 0900435070