Abstract: A fuel injection stub (6) for a ramjet is designed to operate at a high Mach number. According to the invention, said stub includes a carbon-carbon composite body (10), in which a rail of elementary injectors is arranged, and a nose piece (11) consisting of a thin skin of carbon-carbon composite in at least approximately the shape of a dihedron, the edge (11A) of which has a radius of curvature (r) at most equal to 2 mm and the angle of which is at most equal to 15.degree.. Means (23, 27) for injecting a coolant into the sealed chamber (18) are arranged in said body (10), said injection means producing a number of jets of pressurized coolant striking the concave face of said skin (11).