Walter Polaris

1930s Czech piston aircraft engine

Polaris

Walter Polaris
Type  | Radial aero engine
National origin | Czechoslovakia
Manufacturer  | Walter Aircraft Engines

The Walter Polaris was a Czechoslovakian three-cylinder, air-cooled radial engine for powering light aircraft that was developed in the 1930s.[1]

## Applications

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* Letov Š-39
* Rearwin Junior

## Engines on display

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

* Prague Aviation Museum, Kbely

## Specifications (Polaris)

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### General characteristics

* Type: 3-cylinder radial piston engine
* Bore: 105 mm (4.13 in)
* Stroke: 120 mm (4.72 in)
* Displacement: 3.12 L (190 cu in)
* Length: 708 mm (27.9 in)
* Diameter: 926 mm (36.5 in)
* Dry weight: 72 kg (159 lb)

### Components

* Valvetrain: One intake and one exhaust valve per cylinder
* Fuel system: Carburettor
* Fuel type: Petrol
* Cooling system: Air-cooled

### Performance

* Power output: 44 kW (59 hp) at 1,900 rpm
* Compression ratio: 5.15:1

## See also

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Comparable engines

* Blackburne Thrush

Related lists

* List of aircraft engines

## References

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Wikimedia Commons has media related to Walter Polaris.

### Notes

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1. ^ Gunston 1989, p. 174.

### Bibliography

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* Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9

* v
* t
* e

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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