1st-ever liquid-fuelled rocket aircraft flew for only 50 sec
The world's first aircraft to be propelled solely by a liquid-fuelled rocket 'Heinkel He 176' made its first flight on June 20, 1939, which lasted just over 50 seconds. The 900-kg aircraft was estimated to achieve a maximum speed of 750 kmph. Testing of the aircraft ended with only one prototype being built, which was destroyed during WWII in 1943.