Bereznyak-Isayev BI-1, Rocket plane

The Bereznyak-Isayev BI-1 was a revolutionary Russian Rocket plane made by Bereznyak-Isayev that was developed several years before the more widely known Messerschmitt Me 163.
It was to be armed with 2 20 mm cannons and some improvements were considered like ramjets on each wing but this model didn't even pass the wind tunnel test. Unlike the German rocket fighter, the BI-1 was not lost to any fuel accidents. It was lost following an accident in which the plane suddenly made an uncontrollable dive to the ground.
Development was stopped before it could enter service with the Soviet Air Force but was still used as a test glider. One was fitted with ramjet engines in an attempt to extend the range.