The ai-20s drove four-bladed variable pitch reversible props with a diameter of 4. 5 meters (14 feet 9 inches), featuring prominent propeller spinners, and hydraulic actuation for prop pitch. The ivchenko ai-20 is a soviet turboprop engine developed by the ivchenko design bureau in the 1950s. It has been built in large numbers, serving as the powerplant for both the antonov an-12 transport …

It has been built in large numbers, serving as the powerplant for both the antonov an-12 transport … The ivchenko ai-20 is a soviet turboprop engine developed by the ivchenko design bureau in the 1950s. It has been built in large numbers, serving as the powerplant for both the antonov an-12 transport … The ai-20s drove four-bladed variable pitch reversible props with a diameter of 4. 5 meters (14 feet 9 inches), featuring prominent propeller spinners, and hydraulic actuation for prop pitch.