ROCKET MOTOR NOZZLE

PURPOSE:To reduce thickness of a nozzle skirt, by a method wherein, in a nozzle having a thermal insulation member between the nozzle skirt and a member for a structure installed on the outer periphery thereof, the juncture between heat insulation member and the nozzle skirt is formed by a graphite felt. CONSTITUTION:The submerge type nozzle of a solid rocket motor loaded on the uppermost stage of a rocket for space observation is formed by a reinforcing member 2, made of fiber-reinforced plastic, securely fixed to a nozzle retaining member 6 made of a metal and mounted to a motor case 10, and thermal insulation materials 3a and 45 made of fiber-reinforced plastic and securely fixed to the inner and the outer wall of the member 2. Said thermal insulation material 3a forms a staged structure in which the end part of the small size part is formed thicker than other part. The outer peripheral surface of the nozzle skirt 1, made of a ultra-heat-resistant material, is covered by sticking a graphite felt 3b thereto, and the work is formed integrally with the thermal insulation material 3a to form a thermal insulation structure.