Walter Mars I
# Walter Mars I

The Walter Mars I was a nine-cylinder, air-cooled, radial engine for aircraft use built in Czechoslovakia in the late 1920s.

## Design and development

The Mars I was the largest capacity design of a series of three similar radial engines developed by the Walter company. Common cylinders were used for the five-cylinder Walter Vega and the seven-cylinder Walter Venus, the Mars I being a nine-cylinder engine.

## Applications

* ANBO III
* Breda Ba.15
* DAR 4
* DAR 6
* Fizir FN
* Focke-Wulf A 33
* Letov Š-32
* SET 10

## Specifications

Data from Flight, July 1929.

### General characteristics

* Type: 9-cylinder radial engine
* Bore: 105 mm (5.90 in)
* Stroke: 120 mm (4.72 in)
* Displacement: 9.352 L (570.7 cu in)
* Dry weight: 159 kg (350 lb)

### Components

* Fuel system: Zenith Type 42 carburettor; two plugs/cylinder and twin Scintilla magnetos
* Cooling system: Air-cooled
* Reduction gear: Direct drive

### Performance

* Power output: 112 kW (150 hp)
* Compression ratio: 5.15:1
* Power-to-weight ratio: 0.72 kW/kg (0.43 hp/lb)
