Praga D

The Praga Hostivař D was a four-cylinder, air-cooled, horizontally opposed aircraft engine first produced in Czechoslovakia in 1936 but which enjoyed its greatest success after World War II due to the explosion in popularity of sports flying. A version for helicopters was produced post World War II as the Praga DH

Applications
  • Mráz M-2 Skaut
  • Aero XE-II

Specifications (Praga D)

Data from Jane's All The World's Aircraft 1951–52[1]

General characteristics

  • Type: four-cylinder, air-cooled, horizontally opposed
  • Bore: 95 mm (3.74 in)
  • Stroke: 100 mm (3.93 in)
  • Displacement: 2.836 litres (173 cu in)
  • Length: 894 mm (35.19 in) (with propeller boss)
  • Width: 810 mm (31.89 in)
  • Height: 546 mm (21.5 in)
  • Dry weight: 67 kg (148 lb)

Components

  • Valvetrain: 1 inlet and 1 outlet valve per cylinder
  • Fuel system: Zenith carburettor
  • Fuel type: 72 octane
  • Oil system: Dry sump pressure lubrication
  • Cooling system: air

Performance

  • Power output: 56 kW (75 hp) at 2,650 rpm
  • Cruising power: 42 kW (56 hp) at 2,400 rpm
  • Specific power: 19.7 kW/L (0.43 hp/cu in)
  • Compression ratio: 6:1
  • Specific fuel consumption: 235 g/hp hour (0.52 lb/hp hr) at rated power, 220 g/hp hour (0.48 lb/hp hr) at cruise power
  • Oil consumption: 2 - 6 g/hp hour (0.004–0.013 lb/hp hour)
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See also
  • Praga Hostivař

References
  1. Bridgman 1951, p. 48d.
  • Bridgman, Leonard (1951). Jane's All The World's Aircraft 1951–52. London: Sampson Low, Marston & Company, Ltd.

Further reading
  • Bridgman, Leonard, ed. (1947). Jane's all the World's Aircraft 1947. London: Sampson Low, Marston & Co. p. 37d.
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