Kholod (Холод) is the name of a project which was originally developed in Russia. The hypersonicrocket uses a scramjet engine and was created to exceed the speed of 5.75 Ma. The prototype consists of a Soyuz TMKB with liquid hydrogen and modified fillings from the SA-5 Gammon missiles. The entire rocket including the four booster rockets is 12 metres (39 ft) long and 750 millimetres (30 in) in diameter.[1][2][3][4][5][6][7] The project led to other Russian hypersonic rockets like the Igla rocket craft and the Yu-71boost-glide warhead.
^Roudakov, A.S., Y. Schickhman, V. Semenov, Ph. Novelli, and O. Fourt, "Flight Testing an Axisymmetric Scramjet: Russian Recent Advances," 44th Congress of the International Astronautical Federation, Oct. 16– 22, 1993, Graz, Austria
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