Walter Pollux

The Walter Pollux is a Czechoslovakian nine-cylinder, air-cooled, radial engine, built by Walter Aircraft Engines for powering light aircraft and that first ran in 1936. The engine produces 240 kW (320 hp) at 1,800 rpm.^[1]

Pollux
Walter Pollux IIR
Type	Radial aero engine
National origin	Czechoslovakia
Manufacturer	Walter Aircraft Engines
First run	1936

The first known use was on the Fieseler F 2 Tiger in 1934.^[2]

Variants

Pollux II

Direct drive engine

Pollux II-R

Geared engine, reduction ratio 0.666:1

Applications

• Aero A.204
• Avia B.122
• Fieseler F2 Tiger
• Praga BH-41

Engines on display

A preserved example of the Walter Pollux engine is on display at the following museum:

• Prague Aviation Museum, Kbely

Specifications (Pollux II)

Data from Flight,^[3] Jane's all the World's Aircraft 1931^[4]

General characteristics

• Type: 9-cylinder radial piston engine
• Bore: 135 mm (5.3 in)
• Stroke: 170 mm (6.7 in)
• Length: 1,220 mm (48 in)
• Diameter: 1,254 mm (49.4 in)
• Dry weight: 323 kg (712 lb); Pollux IIR 341 kg (751 lb)-geared

Components

• Valvetrain: One intake and one exhaust valve per cylinder
• Fuel system: One Zenith double 60DCJ carburettor
• Fuel type: Benzine - Benzol 50:50
• Oil system: dry sump pressure feed
• Cooling system: Air-cooled
• Reduction gear: Pollux IIR - 0.666:1

Performance

• Power output: Normal:240 kW (320 hp) at 1,800 rpm; maximum 280 kW (380 hp) at 1,900 rpm
• Compression ratio: 6:1
• Specific fuel consumption: 0.282 kg/kWh (0.464 lb/(hp⋅h))
• Oil consumption: 0.013 or 0.021 kg/kWh (0.022 or 0.035 lb/(hp⋅h))
• Power-to-weight ratio: 1 kW/kg (0.61 hp/lb)

See also

Comparable engines

• Alvis Leonides
• Pratt & Whitney R-1340 Wasp

Related lists

• List of aircraft engines