Possible fields of application for light-gas mass accelerators have been considered. The physical model and the results of mathematically simulated processes for internal ballistics have been presented. The comparative analysis of different methods and schemes for providing the gas-light accelerators with a hurled body, viz. hydrogen has been conducted. The feasible and expedient use of metal-hydride techniques and technology for implementation of the body hurling as well as its increase efficiency has been grounded. The experimental test results of metal-hydride hydrogen sources of different types have been submitted.