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S5.98M
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<p>The S5.98M, also known as the 14D30, is a Russian rocket engine, currently powering the <a href="/facts/Briz-M/nPncWv0Q">Briz</a> upper stages. It was designed by <a href="/facts/KB_KhIMMASH/tK6yNnPy">KB KhIMMASH</a>, the famous <a href="/facts/Aleksei_Isaev/pueb3vzM">Isaev</a> designed bureau. It burns a <a href="/facts/Hypergolic_propellant/p0Goa3rn">hypergolic</a> mixture of <a href="/facts/Unsymmetrical_dimethylhydrazine/g08Fzo2D">unsymmetrical dimethylhydrazine</a> (UDMH) fuel with <a href="/facts/Dinitrogen_tetroxide/01WfnHJh">dinitrogen tetroxide</a> (N2O4) oxidizer in a <a href="/facts/Gas-generator_cycle/TxVnVPuV">gas-generator cycle</a>. </p>