KTDU-425

{{Short description|Former Soviet rocket engine}}

{{Infobox rocket engine

|image=File:Mars-Venera station liquid-based engine (2004).jpg

|caption=KTDU-425A at the Cosmos exhibition, GUM, Moscow

|name=KTDU-425 (11D425)|country_of_origin=Soviet Union|manufacturer=Isayev Design Bureau|status=Retired

Propellent: UDMH/N₂O₄|designer=Aleksei Isaev|thrust(Vac)=

18.85 kN (KTDU-425)

18.89 kN (KTDU-425A)

|used_in=Mars 2-7, Venera 9-16

Vega 1,2

Astron, Granat

Phobos 1,2|mixture_ratio=1.9}}

The KTDU-425 was a former Soviet liquid fuelled engine designed Aleksei Isaev of the Isayev Design Bureau. It was mainly used on the 4MV bus, which employed it as its main propulsion system. The first version which was the KTDU-425 (11D425), which had a thrust of 18.85kN was first used in 1971 for Mars-2, Mars-3 as well as the failed M-71C (Kosmos 419) probe.{{Cite web |title=KTDU-425 |url=http://www.astronautix.com/k/ktdu-425.html |archive-url=https://web.archive.org/web/20161228034718/http://astronautix.com/k/ktdu-425.html |url-status=dead |archive-date=December 28, 2016 |access-date=2022-04-17 |website=www.astronautix.com}} This was soon replaced by the KTDU-425A, which had a thrust of 18.89kN. This version was employed on the remaining 4MV and 5VK probes built, as well as Phobos 1 and 2.{{Cite web |title=KTDU-425A |url=http://www.astronautix.com/k/ktdu-425a.html |archive-url=https://web.archive.org/web/20160819190952/http://www.astronautix.com/k/ktdu-425a.html |url-status=dead |archive-date=August 19, 2016 |access-date=2022-04-17 |website=www.astronautix.com}}