 From 1947 until the end of 1950, the German team elaborated concepts and improvements for extended payload and range under the projects G-1, G-2 and G-4.The German team had to remain on Gorodomlya island until as late as 1952 and 1953.In parallel, Soviet work was focused on larger missiles, the R-2 and R-5 under Dmitry Ustinov and Sergei Korolev, based on further developing the V-2 technology with using ideas of the German concept studies.