An engine designed by a team led by engineer Krulisz at the Motorlet factory (formerly Walter). Numerous technical difficulties arose during the design and prototype construction phases. State acceptance trials were not conducted until 1955. The engine entered series production. It was a rather unsuccessful design and caused many technical problems during operation. It was used in the Aero L-60 Brigadyr aircraft.
| Configuration | 6-cylinder horizontally opposed (boxer) |
| Cooling | air |
| Compression ratio | 7.0 |
| Displacement | 7.16 l |
| Propeller reduction | 0.55 |
| Weight | 214 kg |
| Maximum power | 220 hp at 3000 rpm |
| Rated power | 200 hp at 2900 rpm |
