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Rolls-Royce Dart Mk. 520 Turboprop Engine, Cutaway


Display Status:

This object is on display in the America by Air exhibition at the National Air and Space Museum in Washington, DC.

Collection Item Summary:

Design of the Rolls-Royce Dart turboprop engine began in April 1945 and completed by June 1946. The engine first ran in July 1946, and first flew in the nose of a Lancaster testbed aircraft in October 1947. A major contribution to the initial success of the Dart was its selection for the Vickers Viscount, the first turboprop-powered airliner. Powered by four 932 KW (1,250 shp) Dart Mk. 504 engines, the prototype Viscount 630 first flew in July 1948. Ultimately, the Dart was upgraded to develop more than 2,237 KW (3,000 shp). Production ended in 1987, with 7,100 engines delivered.

Other commercial aircraft using the Dart were the Fokker F.27 Friendship, Fairchild Hiller 227, Hawker Siddeley 748, Grumman Gulfstream I, and NAMC YS-11. Military versions powered such aircraft as the Breguet Alize, Handley Page Herald, Armstrong Whitworth Argosy, Avro 748, and Andover CC Mk. 2. This artifact powered the Vickers Viscount 806.

Collection Item Long Description:

Data Source

National Air and Space Museum


Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


Lionel Haworth

Credit Line

Gift of Rolls-Royce, Ltd


Metal, plastic


  • 3-D: 247.9 × 96.3cm (97 5/8 × 37 15/16 in.)
  • Support: 128.3 × 81.3 × 99.1cm (50 1/2 in. × 32 in. × 39 in.)

Country of Origin

United Kingdom



Physical Description

  • Type: Turboprop
  • Power rating: 1353 kW (1,815 ehp) at 15,000 rpm
  • Compressor: 2-stage centrifugal
  • Combustor: 7 combustion chambers
  • Turbine: 3-stage axial
  • Weight: 534 kg (1,177 lb)


PROPULSION-Turbines (Jet)

Inventory Number