Bora
Walter Bora
Type	Radial aero engine
National origin	Czechoslovakia
Manufacturer	Walter Aircraft Engines

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.^[1]

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^[2]

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)