M10 (rocket engine)

M10 is a liquid-fuel upper-stage rocket engine by Avio on behalf of European Space Agency for use on Vega E. The engine, initially known as "LM10-MIRA", is a derivation of the existing Russian RD-0146 engine and result of a collaboration between "Avio" and Chemical Automatics Design Bureau (KBKhA) ended in 2014. the engine ground qualification is foreseen for 2024 with consequent maiden flight on a Vega-E launcher by 2025.
Overview.
The M10 engine is the first operational European methane rocket engine, conceived for use on upper stages of future "Vega-E" and "Vega-E Light" launchers, in which will replace both the solid-fueled Zefiro 3rd stage and hydrazine-fueled AVUM 4th upper stage. An industrial team directed by "Avio" with companies of Austria, Belgium, France, Czech Republic, Romania and Switzerland will manufacture the engine. The "M10" minimum thrust requirements are a thrust of with a propellant mixture ratio of 3.4 and a minimum specific impulse of 362s.
Development.
A feasibility study on improving "Vega" started in 2004, when the rocket was still in development, with the aim of increase performance, reduce costs and move away from toxic hydrazine fuels. The study proposed a new three-stage version of the rocket named Lyra with a liquid oxygen-methane upper stage.
In 2007 Avio and KBKhA started the collaboration for the development of such an engine under an agreement signed between Italian and Russian governments in Moscow on November 28, 2000. The first phase of the collaboration, ended in 2008, aimed at designing a concept for a 10t thrust LOx-LNG engine. The second phase of the collaboration focused instead at designing, manufacture and test a 7.5t thrust "LM10-MIRA" demonstrator engine. The engine was successful tested in June 2014 in Voronezh, Russia.
After the end of the collaboration with "KHBhA", "Avio" continued with the development of "M10" under the "Vega-Evolution" program returning to the original target thrust of 10t. Objectives were finalizing development of main subsystems such as turbopumps, valves, igniter, thrust vectoring and a new ALM 3D printed Thrust Chamber Assembly (TCA). A subscale model of the TCA was tested successfully on 13 November 2018 in Colleferro, Italy.
In February 2020 a full scale engine with a 3D printed TCA was successfully tested at NASA Marshall Space Flight Center, firing 19 times for a total of 450 seconds.