R-7 Semyorka

The R-7 was designed by Sergei Korolev and his team at OKB-1 as the Soviet Union''s first intercontinental ballistic missile, intended to deliver a nuclear warhead to the continental United States. Its four strap-on boosters and central core configuration was driven by the limitations of Soviet engine technology: unable to build a single engine powerful enough, Korolev clustered twenty engines across five separate rocket bodies.

On October 4, 1957, an R-7 launched Sputnik 1, the first artificial satellite, into orbit. The 184-pound sphere''s radio beeps, detectable by amateur radio operators worldwide, stunned the Western world and ignited the Space Race. Four years later, on April 12, 1961, a modified R-7 (designated Vostok-K) carried Yuri Gagarin on the first human spaceflight, a single orbit of the Earth lasting 108 minutes.

The R-7 was a mediocre ICBM -- it required hours of preparation, used non-storable cryogenic propellants, and could only be launched from fixed, vulnerable sites. But as a space launch vehicle, its design was brilliant. The tapered strap-on boosters separated cleanly, the staging sequence was elegant, and the basic architecture proved endlessly adaptable. Every Soyuz rocket flying today traces its lineage directly to Korolev''s R-7, making it the most influential rocket design in history.