The book describes thermogasodynamic bases of calculation of rocket engines on solid fuel (RDTT), engineering methods of calculation of heat exchange processes, bases of theory of combustion of solid fuels and calculation of indicator pressure curve in combustion chamber of the engine. Basic information on solid rocket fuels and heat-protective coatings used in RDTT. The regulation of thrust in the RDTT in size and direction is considered, as well as the general technique of ballistic design of solid fuel missiles .. Compared to the first edition, the book has been significantly revised and supplemented. The main additions are: the solution of simplified problems of internal ballistics of classical artillery and recoilless guns a detailed solution of the problem of internal ballistics RDTT for all characteristic periods of its functioning. The solution is given for three expressions of the solid fuel combustion law a more detailed solution of the heat and mass transfer problem for thermal insulation coatings with weight loss solution of the problem of erosional combustion of solid rocket fuels and the calculated determination of the fuel flash time. The book is a textbook for students of higher technical educational institutions. It will also be of interest to engineers specializing in solid-fuel rocket engines.