Sergey Korolev's signature and corrections on a technical paper ''Specifications of the electric equipment of a glider plane SK-7''

14 of July, 1935. [3] pp. Fine condition. Light tears of the edges.

Sergey Korolev (1906-1966) was the Soviet engineer and spacecraft designer who now considered the father of practical astronautics and the founder of the Soviet space program. He led Soviet efforts to build and test the nation's first rockets in the 1930s and was later responsible for building the Vostok capsule used for the first human spaceflight by cosmonaut Yuri Gagarin in 1961. Korolev is credited with many technological discoveries that became widely used in space exploration and military defence.Like in Germany and United Stated the Russian organizations by the early 1930s were testing liquid-fueled rockets of increasing size. Reaction Propulsion Scientific Research Institute developed a series of rocket-propelled missiles and gliders during the 1930s, culminating in Korolev's RP-318, Russia's first rocket propelled aircraft. It started in 1934 when he developed a project (at that time SK) for so called 'planerlet' (motor glider) - a heavier-than-air aircraft with eight seats and low-power engine without independent takeoff. The idea of creating such an apparatus was based on the growing need of national economy in aircrafts. A planerlet was supposed to combine advantages of a plane and a glider.Korolev was working on his project mostly by himself in the evenings and at nights. He was almost seriosly considering that one doesn't need to sleep every night. With the help of a few other engineers the first construction was soon finished and successfully tested. Later newly developed SK-9 became the basis for Korolev's project of a rocket-powered aircraft.