Kroeber M4
| Industry | Aircraft engine manufacturing |
|---|---|
| Founded | late 1930s |
| Headquarters | Germany |
| Products | Air-cooled two-stroke piston engines |
The Kroeber M4 Köller was an air-cooled, two-stroke piston engine with a horizontally opposed twin-cylinder layout, engineered and manufactured by Dr. Kroeber & Sohn G.m.b.H. in Germany during the late 1930s. This engine gained moderate popularity as a powerplant for the lightweight aircraft and motor-gliders that were widely used throughout the 1920s and 1930s.
Variants
- Kroeber M3 Köller
- Possibly a typographical error or a variant related to the M4, with its sole mention found in Cynk's work on Polish aircraft from 1893 to 1939.
- Kroeber M4 Köller
- The principal production model.
Applications
Information sourced from AEHS: HOAE Kroeber
- Grunau Motor-Baby – A German motor-glider adaptation of the Grunau Baby glider
- Kocjan Bąk I – Polish motor-glider
- Dittmar Condor 'La Falda' – Featured a detachable power unit equipped with the M4 engine and a pusher propeller
- Möller Stomo 3 – German ultralight aircraft designed for high-speed flight
- Akaflieg München Mü13M Motormerlin
- ITS-8 – Polish motor-glider reportedly powered by the Kroeber M3 Köller (the only reference to M3)
Engines on display
Multiple examples of the M4 remain preserved and exhibited, with one of the finest specimens housed at the Polish Aviation Museum located in Kraków.