The Soviet-designed Mil Mi-26 is a twin-engine heavy transport helicopter that entered into service in 1985 in both military and civilian roles. It is the largest and most powerful helicopter to have gone into serial production. The Mi-26 with a take-off weight of 56 tons and a fuselage of over 33 meters is powered by two powerful Ukrainian D-136 turboshaft engines which move the main rotor which is 32 meters in diameter. The Mi-26 is capable of transporting up to 20 tons of cargo or 90 troops or 60 stretchers.
The world’s largest Mi-26 transport helicopters used by the Russian army may soon be grounded after Ukrainian law enforcers arrested Viacheslav Bohuslaiev, the head of the Zaporizhzhia-based Motor Sich plant, which deprived Russia of supplies of Ukrainian D-136 engines used to power the Mi-26s. The Russian replacement for D-136s could go into production only in 2025 and if the prototype that has been in development since 2016 would be completed, according to the Polish portal Defense24.