The development of RD-270 started on 26 June 1962. Preliminary investigations and development of the engine and its further production were performed under the guidance of Valentin Glushko and finished in 1967. It became the most powerful engine in the world with use of high-boiling propellant to date. During 1967–1969, several test firings were performed with experimental engines that were adapted to work at sea level and had a short nozzle. In total, 27 test firings were performed with 22 engines, three engines were tested twice, and one of them was tested three times. All works stopped later together with corresponding activities on the UR-700 project.