Avia S-199 - Native users

The Avia S-199 is a propeller fighter aircraft built in Czechoslovakia after the World War II. It was the first fighter to serve with the Israeli Air Force. It was highly unpopular among both Czechoslovak and Israeli pilots who nicknamed it as "Mezek" (Mule in Czech) and "Sakeen" (knife in hebrew) respectively.

As Avia had depleted every Daimler-Benz DB 605 engines that were available, they turned to power the remaining Bf-109G-6 airframes that were left with the Junkers Jumo 211F engines and propellers, initially intended for the Heinkel He.111 bomber. That setting gave the airplane extremely complicated handling capabilities. It lacked the responsiveness of the DB 605 engine and high amounts of torque which, combined with the narrow undercarriage, made the take-off and landings very difficult and risky.

The original DB 605 also allowed a machine gun firing through the propellers, however this wasn't possible with the Junkers Jumo 211F, as they were intended to be used in the Heinkel He.111 which made some Israeli pilots to shot their own propellers when in combat. That's why the S-199 used a modified version of the Luftwaffe's Rüstsatz modification kit which consisted on two MG.151 under the wings. That arrangement further impinged the aircraft's performance.

Approximately 500 of them were built among them the trainers, designated CS-199 which was armed and C-210 which was unarmed. It flew for the first time in 1947 and the last airplane rolled out from the production line in 1949. Last airplanes served with the Czechoslovak National Security Guard until 1957.

Sources:
1. https://en.wikipedia.org/wiki/Avia_S-199
2. Salamander Books - The Complete Book of Fighters