Power unit for solid fuel rocket has outer drive set and inner drive set in form of external burner separated from out of the unit by annular gap

摘要

The power unit has a co-axial drive unit (1) consisting of an external burner, an outer drive set (4) and an inner drive set (5) separated from it by an annular gap (9). The external burner is fitted to the front end wall (17) of the combustion chamber. The inner circumferential surface (10) of the outer drive set and the outer circumferential surface (8) of the inner drive set are arranged so that the effective surface of the coaxial drive set is reduced over the duration of the combustion.