attack. See also Comparison of orbital rocket engines Staged combustion cycle used in engine RD-191 derivative engine being developed for the Angara rocket RD-0124 used in the Soyuz-2.1b RD-107 used in the R-7 Semyorka missiles and Soyuz FG RD-58 upper stage RP-1/LOX engine used in the N-1 rocket, derivatives used in the Proton and Zenit rockets References External links Astronautix.com page on RD-180 RD-180 page (in Russian) at NPO Energomash RD-180 specifications and design (in Russian) The Engines That Came In From The Cold!, Equinox, Channel Four Television Corporation, 2000. Documentary video on Russian rocket engine development of the NK-33 and its predecessors for the N1 rocket, the development of the staged combustion cycle, and the eventual 1990s resurgence that led to the RD-180 engine sold to the US launch provider Lockheed Martin for the Atlas III. (NK-33 story starts at 24:15–26:00 (program was shuttered in 1974); the 1990s resurgence and eventual sale of the remaining engines from storage starts at 27:25; first use as RD-180 on a US rocket launch in May 2000.) Rocket engines of Russia Rocket engines using kerosene propellant Rocket engines using the staged combustion cycle Energomash rocket engines