Walter Bora
# Walter Bora

The Walter Bora was a Czechoslovakian nine-cylinder, air-cooled radial engine for powering light aircraft that was developed in the 1930s by Walter Aircraft Engines.

## Variants

### Bora II

    Direct drive engine

### Bora II-R

    Geared engine, reduction ratio 0.666:1

## Applications

* Aero A.200
* Nardi FN.305
* RWD-9
* SIAI-Marchetti SM.101

## Engines on display

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

* Prague Aviation Museum, Kbely

## Specifications (Bora II-R)

Data from Flight

### General characteristics

* Type: 9-cylinder radial piston engine
* Bore: 105 mm (4.1 in)
* Stroke: 120 mm (4.7 in)
* Dry weight: 172 kg (379 lb)

### Components

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

### Performance

* Power output: 183 kW (245 hp) at 2,400 rpm
* Compression ratio: 6.3:1
* Power-to-weight ratio: 1 kW/kg (0.65 hp/lb)
