Yakovlev EG

The Yakovlev EG, short for Eksperimentalnyi Gelikopter and also known as the Yak-M11FR-1 and Sh (Shootka), was an experimental helicopter with coaxial contra-rotating rotors. Its welded steel tube fuselage carried a pilot and a passenger side by side under a glazed canopy, with a Shvetsov M-11FR five-cylinder radial engine mounted behind the gearbox and a fixed tricycle undercarriage. V. V. Tezavrovsky made the first flight in December 1947. Flight testing showed vibration at forward speeds above 20 to 30 km/h, and the tailplane and fins were removed in an attempt to reduce it. A 190 hp M-12 engine fitted in early 1948 proved troublesome, so an M-11FR was refitted to complete the flight trials by 8 July 1948.