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Solid-propellant rocket - Wikipedia. Circular bore: if in BATES configuration, produces progressive-regressive thrust curve.; End burner: propellant burns from one axial end to other producing steady long burn, though has thermal difficulties, center of gravity (CG) shift.
Solid-propellant rocket - Wikipedia. A solid-propellant rocket or solid rocket is a rocket with a rocket engine that uses solid propellants (fuel/oxidizer).The earliest rockets were solid-fuel rockets powered by gunpowder; they were used in warfare by the Chinese, Indians, Mongols and Persians, as early as the 13th century.