据法国《航空与宇航》1982年第924期报道:法国 M4潜地导弹除有401、402、403三级主发动机以外,还有两台专用于弹头释放的小发动机-404发动机。这两台小发动机安装在导弹头部,成直线排列在403发动机的两侧(见右图)。M4导弹是法国新一代的三级固体潜地导弹, According to the French Aeronautics and Astronautics No. 924 of 1982 reported: French M4 missiles in addition to 401,402,403 three main engines, there are two dedicated to the release of a small engine warhead -404 engine. These two small engines are mounted on the missile’s head and line up on either side of the 403 engine (see right). M4 missile is a new generation of French three solid submarine missiles,