Praga D
# 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
* IFIL-Reghin RG-6 (1957)

## 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 L (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)
