Walter NZ 120

The Walter NZ 120 was a nine-cylinder, air-cooled, radial engine for aircraft use. It was built in Czechoslovakia by Walter Aircraft Engines in the 1920s. Using common cylinders and parts from the NZ (Novák-Zeithammer) range of engines the NZ 120 produced up to 135 horsepower (99 kW).^[1]

NZ 120
Walter NZ 120 on display at the Aviation Museum of Central Finland
Type	Radial aero engine
National origin	Czechoslovakia
Manufacturer	Walter Aircraft Engines
First run	1920s

Applications

• Avia B.122
• Breda Ba.26
• Fizir FN
• Junkers K 16
• Letov Š-218
• Praga BH-39NZ
• RWD 8

Specifications

General characteristics

• Type: Nine-cylinder radial piston engine
• Bore: 105 mm (4.134 in)
• Stroke: 120 mm (4.724 in)
• Displacement: 9.352 L (570.7 cu in)
• Dry weight: 148 kg (326 lb)

Components

• Valvetrain: Overhead valve, two poppet valves per cylinder
• Cooling system: Air-cooled
• Reduction gear: Direct drive

Performance

• Power output: 99.3 kW (135 hp) at 1,750 rpm (take-off power)
• Compression ratio: 4.48:1

See also

Related development

• Walter NZ 60

Related lists

• List of aircraft engines