Sergant A

The Sergant A was a French 4-cylinder, air-cooled, upright inline piston engine with a maximum output of 7.5 kW (10 hp), designed to meet the needs of the very small and light single seat sports aircraft of the early 1920s. It was used by at least ten different types.

Sergant A
Type 4-cylinder, air-cooled, upright inline piston engine
National origin France
Manufacturer Sergant
Designed by Sergant

Design and development

In both the UK and France in the early 1920s there was a wish to make civilian flying more affordable, both in capital outlay and in running costs. This led to a need for low power engines. In Britain there were suitable engines like the Bristol Cherub but French designers were largely forced to import engines, either from the UK or Italy. The Sergant A was intended to provide a native product.

It was on display at the November 1923 Paris Salon and struck Flight's reporter as "extremely interesting" and car-engine like in its four cylinder inline arrangement, a little heavy but reliable. It was unusual in its high maximum crankshaft speed of 3,200 rpm and the availability of a choice of reduction gear ratios.[1]

Operational history

The date of first running is not known but it appeared, and was widely used by a variety of aircraft and in several contests during 1923, with more in 1924.

Applications

Specifications

Data from Les Ailes, August 1923;[2] Flight, February 1924[1]

General characteristics

  • Type: 4-cylinder, air-cooled, upright inline piston engine
  • Bore: 55.5 mm (2.19 in)
  • Stroke: 80 mm (3.1 in)
  • Displacement: 750 cm3 (46 cu in)
  • Length: 776 mm (30.6 in)
  • Width: 340 mm (13 in)
  • Height: 565 mm (22.2 in)
  • Dry weight: 46 kg (101 lb) including carburettor and magneto[3]

Components

Performance

  • Power output: 12 kW (16 hp) at 3,200 rpm crankshaft speed
  • Power-to-weight ratio: 0.26 kW/kg (0.16 hp/lb)

References
  1. "Some French light 'plane engines". Flight. XVI (791): 105–6. 21 February 1924.
  2. "Le Moteur Sergant 16 HP". Les Ailes (114): 2. 23 August 1923.
  3. Hirschauer 1923-4, L.; Dollfus, Ch. (1924). L'Année Aéronautique. Paris: Dunod. pp. 64–5.
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