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Аннотация Conceptual analysis of the "ramjet-in-tube" accelerator capabilities for the small projectiles acceleration up to velocities of 10-12 km/s has been performed. Result of calculations in one-dimensional quasy-steady approximation have clearly shown, that, even if the most favourable high energy mixture "hydrogen + oxygen" and optimum modes of the combustion are used, maximum velocity, which one can reach in this device, does not exceed 7.6 km/s, because of energy limit. Another techniques for attainable velocities offered with the help of the pushing piston, which. is following the accelerated projectile with not so large velocity