June 27th - on this day in 1971, the Soviet Union carried out the third launch attempt of its giant N1 Moon rocket, when the rocket with the serial numner 6L lifted off from Site 110/37 at the Baikonur Cosmodrome. The Block A first stage was powered by 30 NK-15 staged combustion cycle kerolox engines, while the Block B second stage featured eight vaccum-optimized NK-15V engines. The Block V third stage had four smaller NK-21 engines. The launch vehicle carried a mockup of the Soyuz 7K-LOK spacec