Originally posted by M21Sniper
This is a common misconception, mostly due to the remarkably similar aerodynamic layout between the YA-9 and the Su-25 .
The aerodynamic layout of the Su-25 was nevertheless defined as early as August 1968 with the Sukhoi Design Bureau's T-8 LSSh project, i.e. more than 4 years before YA-9's first flight.
As a sidenote, it seems that one of the very first design from the unofficial committee set up at the Yuri Gagarin Air Force academy was for a twin-boom, twin-engined layout.
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