Walter Castor

The Walter Castor was a Czechoslovak seven-cylinder, air-cooled radial engine for powering aircraft that was developed in the late 1920s. The Super Castor was a nine-cylinder development.^[1] Castor I production began in 1928, Castor II in 1932 and the Castor III in 1934.

Castor
Walter Castor III
Type	Radial aero engine
National origin	Czechoslovakia
Manufacturer	Walter Aircraft Engines
First run	1929

Applications

• Aero A.35
• Aero A.304 (Super Castor)
• Airspeed Envoy
• Breda Ba.25
• Dornier Do K
• Fizir F1V
• Hopfner HV-6/28
• Letov Š-28
• Rogozarski AZR
• Savoia-Marchetti S.71

Engines on display

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

• Prague Aviation Museum, Kbely

Specifications (Castor I)

Walter Castor I (1928)

Data from Flight.,^[2] L'Air 1 December 1929: Les Moteurs Walter^[3]

General characteristics

• Type: 7-cylinder radial piston engine
• Bore: 135 mm (5.31 in)
• Stroke: 170 mm (6.69 in)
• Displacement: 17.033 L (1,039.4 cu in)
• Dry weight: 248 kg (547 lb)

Components

• Valvetrain: One intake and one exhaust valve per cylinder
• Fuel system: Zenith carburettor
• Fuel type: 50% Petrol, 50% Benzol
• Cooling system: Air-cooled

Performance

• Power output: 180 kW (240 hp) at 1,750 rpm normal
• Compression ratio: 6:1
• Specific fuel consumption: 0.302 kg/kWh (0.496 lb/(hp⋅h)) at 0.8 - 0.81 specific gravity
• Oil consumption: 0.027 kg/kWh (0.044 lb/(hp⋅h))
• Power-to-weight ratio: 0.78 kW/kg (0.48 hp/lb)

See also

Comparable engines

• Armstrong Siddeley Lynx

Related lists

• List of aircraft engines