|Country of origin||Russia|
|Designer||KBKhA Design Bureau|
|Propellant||LOX / LH2|
|Thrust (vacuum)||68.6 kN (15,400 lbf)|
|Chamber pressure||5.9 megapascals (860 psi)|
|Specific impulse (vacuum)||470 seconds (4.6 km/s)|
|Length||3.558 metres (11.67 ft)|
|Diameter||1.95 metres (6 ft 5 in)|
The RD-0146 is a Russian cryogenic rocket engine. The RD-0146 engine was developed by KBKhA design bureau in Voronezh, Russia, in cooperation with the American Pratt & Whitney Rocketdyne company. In 2009, it came into prominence, as Russian space agency chose it for the second-stage of the proposed Rus-M launch vehicle designed to carry the future Russian PPTS crewed spacecraft.[full citation needed] After the cancellation of Rus-M rocket, the RD-0146D variant was selected as the powerplant for the KVTK upper stage.
In 1999, Khrunichev requested KBKhA to develop RD-0146U version of the engine for Proton and Angara rockets. The development of the engine was partially financed by Pratt & Whitney Rocketdyne. Pratt & Whitney signed a preliminary marketing agreement on April 7, 2000 with Russia's Chemical Automatics Design Bureau giving Pratt & Whitney exclusive international marketing rights to the RD-0146.
The RD-0146 is the first Russian rocket engine not to feature a gas generator and to be equipped with extendable nozzle extension without a cooling system. The engine is capable of five firings and thrust control in two planes. According to the developer, the lack of a gas generator system ensures higher reliability of the engine for multiple firings, by removing the potential of an ignition failure in the engine power cycle.
LM10-MIRA is a Liquid oxygen-Liquid methane demonstrator engine developed by Avio and KBKhA from RD-0146 under an agreement signed between Italian and Russian governments in Moscow on November 28, 2000. The 7.5t engine was successful tested in June 2014 in Voronezh, Russia. After the end of the collaboration with KHBhA, Avio continued the development of the M10 engine under the Vega-Evolution program with a target thrust of 10t. As of March 2021[update] the engine ground qualification is foreseen for 2024.