The RD-0233 (Russian: Ракетный Двигатель-0233, romanized: Raketnyy Dvigatel-0233, lit. 'Rocket Engine 0233', GRAU index: 15D95) and RD-0234 (GRAU index: 15D96) are liquid-fueled rocket engines which burn a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N2O4) oxidizer in an oxidizer-rich staged combustion cycle. The only difference between the RD-0233 and the RD-0234 is that the latter has a heat exchanger to heat the pressuring gasses for the tanks. Three RD-0233 and one RD-0234 are used on the first stage of the UR-100UTTKh ICBM. While the engine is out of production, the ICBM as well as Rokot and Strela remain operational as of 2015.
See also
UR-100N - ICBM for which this engine was originally developed for. Rokot - launch vehicle that is a repurposed UR-100N. Strela - launch vehicle that is a repurposed UR-100N. Rocket engine using liquid fuel
References
External links KbKhA official information on the engine. (Archived) Encyclopedia Astronautica information on the propulsion module.