Aircraft engine: PZL WN-3
|Displacement||13.4 l (793.3 cu in)|
|Weight||240 kg (529 lb)|
|Maximum power||320 hp at 2,350 RPM|
|Cruise power||283 hp at 2,250 RPM|
First Polish-designed aircraft engine to enter serial production after WW2.
At the beginning of the 1950s the Polish military aviation laid an order for a new training aircraft, which was designed by Tadeusz Sołtyk. The then-available Soviet radial engines did not fulfill Polish Air Force requirements, therefore a new powerplant had to be constructed.
A team led by Wiktor Narkiewicz designed a very successful design, meeting these specifications. It was a further development of the earlier WN-2 version. The design had its roots in pre-war Polish engines. The WN-3 had no supercharger nor propeller reduction gear, and compressed air was used for startup.
The new powerplant was produced at the WSK Kalisz. The production lasted until 1970 and totalled 329 examples. The WN‑3 was used on the WSK TS‑8 Bies trainer and the WSK MD‑12 passenger aircraft prototypes.