Abstract: In a hot gas generator with lamellar powder charge, the charge comprises a plurality of powder lamellae disposed side by side at regularly spaced intervals and projecting from a flexible shoe in which they are anchored by partial penetration into the shoe of anchoring teeth provided along one marginal edge portion of each lamella, so that between two teeth of the same lamella there is a communication aperture communicating the spaces on each side of the lamella. This permits instantaneous balancing of pressures between the various spaces, and minimizes the amount of the lamellae outside the normal process of combustion. The powder charge is assembled in the form of a mat with upstanding lamellae, and the mat or shoe is then shaped and formed to conform to a selected portion of the combustion chamber of a hot gas generator.