 Only one example was built, but the parallel two-seat attack version led to the successful Ilyushin Il-10.In 1943, Sergey Ilyushin started work on a new aircraft, the Il-1 armoured fighter, in both single- and two-seat versions.The Il-1 was similar to the Ilyushin Il-2 design, but was more modern and compact, and powered with a new Mikulin engine, the AM-42.