A flexible rubber boot that transmits molding pressure to the inner surface of the structure to be molded is placed on a support fixture. The boot is held in place by a vacuum applied between the fixture and the boot. Prepregs are laid up on the boot to the desired depth and in a desired configuration....http://www.google.de/patents/US4693678?utm_source=gb-gplus-sharePatent US4693678 - Male layup-female molding system for fabricating reinforced composite structures
