| Major | |
|---|---|
 | |
| Walter Major 4 (1934) | |
| Type | Inline piston engine |
| National origin | Czechoslovakia |
| Manufacturer | Walter Aircraft Engines |
| First run | 1934 |
Walter Major was a family of Czechoslovak aircraft inline engines developed by Walter Aircraft Engines in the 1930s.
Available in either four or six cylinder configuration, with identical bore and stroke of 118 mm (4.6 in) and 140 mm (5.5 in), respectively, the Walter Majors were primarily used in light aircraft. License-built in Poland by the state-owned Państwowe Zakłady Inżynieryjne (as the PZInż. Major 4), the engine was used in, among others, Zlin Z-XIII, RWD-11 and one of the PWS-35 Ogar prototypes.
Comparable engines
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The Alfa Romeo 122 was a 12-cylinder inverted-V aircraft engine produced in 1941 by Alfa Romeo Milano as a licence-built Czechoslovakian Walter Sagitta, featuring a single-speed supercharger. The 122 R.C.38 major production variant had a reduction gearbox, single stage super-charger and rated altitude of 3,800 m (12,500 ft).