Sunbeam Nubian

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Nubian
Type V-8, 90 degree, water-cooled, piston engine
National origin Britain
Manufacturer Sunbeam[1]
Designed by Louis Coatalen[1]
First run 1916[1]
Major applications Saunders T.1[1]
Produced 1916-1917[1]
Number built 36[1]

The Sunbeam Nubian, also called the Sunbeam 155 hp, was a British 8-cylinder aero-engine that was first run in 1916.[1]

Design and development[edit]

In March 1916 Louis Coatalen, the chief designer at Sunbeam, responded to the Admiralty's request for more powerful engines by designing the V-8 Nubian. The Nubian featured the twin overhead camshafts and four valves of his pre-war engines for Grand Prix and TT racing cars. With a bore of 95 mm (4 in) and stroke of 135 mm (5 in) the Nubian displaced 7.685 l (469 cu in) and was rated at 155 hp (116 kW) with a reduction gear ratio of 0.615:1.[1]

The original engine was built with 60 degree angle between cylinder banks but severe vibration problems forced Coatalen to redesign it with a 90 degree angle, emerging as the Nubian II. Intended to power the Supermarine AD Flying Boat the teething troubles of the Nubian forced Supermarine to use a 150 hp (112 kW) Hispano-Suiza V-8 engine instead.[1]

Deliveries of the Nubian II began in October 1917, by which time the Nubian was overshadowed by the more powerful V-8s from Hispano-Suiza and the 200 hp (149 kW) Sunbeam Arab. The only aircraft known to have been powered by a Nubian was the Saunders T.1, but some of the 36 engines built, of 50 ordered, are believed to have been supplied to the Imperial Russian Air Service.[1]

The Nubian suffered from a poor design decision at first and was overtaken by events which prevented widespread use, but its cousin, the V-12 Sunbeam Afridi and its family members found greater success.[1]

Variants[edit]

Sunbeam Nubian
The initial V-8 engine with 60 degree Vee and rated at 155 hp (116 kW).
Sunbeam Nubian II
Re-designed with 90 degree cylinder angle to alleviate severe vibration problems, the Nubian II was late in delivery and was not widely used.

Applications[edit]

Specifications (Nubian II)[edit]

Data from Sunbeam Aero-Engines[1]

General characteristics

  • Type: V-8 90 degree Vee, water-cooled piston engine
  • Bore: 95 mm (4 in)
  • Stroke: 135 mm (5 in)
  • Displacement: 7.685 l (469 cu in)
  • Length: 1,052 mm (41 in)
  • Height: 765 mm (30 in)
  • Dry weight: 310 kg (683 lb)
  • Designer: Louis Coatalen

Components

  • Valvetrain: Twin direct overhead camshaft, two exhaust and two inlet valves per cylinder
  • Fuel system: gravity fed
  • Fuel type: Gasoline
  • Oil system: Dry sump, pressure fed
  • Cooling system: Water-cooled by radiator
  • Reduction gear: 0.615:1

Performance

  • Power output: 115.6 kW (155 hp)

See also[edit]

Comparable engines
Related lists

References[edit]

  1. ^ a b c d e f g h i j k l Brew, Alec (1998). Sunbeam Aero-engines. Shrewsbury: Airlife Publishing. ISBN 1-84037-023-8. 
  2. ^ Jackson, A.J. Blackburn Aircraft since 1909 (1st ed.). London: Naval Institute Press. pp. 106–109. ISBN 0-87021-024-6. 

Bibliography[edit]

  • The Illustrated Encyclopedia of Aircraft. London: Aerospace Publishing. 
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
  • Brew, Alec (1998). Sunbeam Aero-engines. Shrewsbury: Airlife Publishing. ISBN 1-84037-023-8. 
  • Jackson, A.J. Blackburn Aircraft since 1909 (1st ed.). London: Naval Institute Press. pp. 106–109. ISBN 0-87021-024-6. 

External links[edit]