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Praga D

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The Praga 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

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Applications

  • Mráz M-2 Skaut

    • Specifications (Praga D)

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

    General characteristics

  • Type: four-cylinder, air-cooled, horizontally opposed
  • Bore: 95 mm (3.74 in)
  • Stroke: 100 mm (3.93 in)
  • Displacement: 2.836 Liters (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 carburetor
  • 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)

    • References

    Praga D Wikipedia
    (Text) CC BY-SA


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