Walter Pollux

1930s Czech piston aircraft engine

Pollux

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

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]

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

## Variants

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Pollux II
Direct drive engine
Pollux II-R
Geared engine, reduction ratio 0.666:1

## Applications

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

## Engines on display

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

* Prague Aviation Museum, Kbely

## Specifications (Pollux II)

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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

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Comparable engines

* Alvis Leonides
* Pratt & Whitney R-1340 Wasp

Related lists

* List of aircraft engines

## References

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Wikimedia Commons has media related to Walter Pollux.

1. ^ Gunston, Bill (1989). World encyclopaedia of aero engines (Fully rev. 2nd ed.). P. Stephens. p. 174\. ISBN 1-85260-163-9.
2. ^ "unknown". Flug Revue. November 2000. `{{cite journal}}`: Cite uses generic title (help)
3. ^ "ENGINES at the PARIS SHOW" (pdf). Flight. XXX (1457): 578–579. 26 November 1936. Retrieved 26 December 2018.
4. ^ Grey, C.G., ed. (1931). Jane's all the World's Aircraft 1931. London: Sampson Low, Marston & company, ltd. pp. 29d–30d.

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Walter aircraft engines

License produced engines|

* Jumo IV C
* Jupiter
* Mars
* Merkur
* Mira
* Mistral
* Pegas
* W-III
* W-IV
* W-V
* W-VI
* W-VII
* W-VIII

Opposed engines|

* Atom
* M202
* M208

Inline engines|

* M 332
* M 337
* Junior
* Major 4
* Major 6
* Mikron
* Minor 4
* Minor 6

V-12 engines|

* Sagitta
* Minor 12

Radial engines|

* NZ 40
* NZ 60
* NZ 85
* NZ 90
* NZ 95
* NZ 120
* Atlas
* Bora
* Castor
* Gemma
* Mars I
* Polaris
* Pollux
* Regulus
* Scolar
* Super Castor
* Vega
* Venus

Turbojets|

* M05
* M06
* M701

Turboprops|

* H80
* M601
* M602

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