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美国空军和航宇局已决定在惯性末级火箭的两台固体发动机中较小的一台上使用可延伸喷管。这样,惯性末级将成为第一个使用近几年发展起来的可延伸喷管技术的火箭。这种较小型发动机的主喷管,从喉部到出口面长约0.80米,利用套装在一起的两个碳碳出口锥,喷管可分两步延伸。每次使喷管伸长0.6米,即第一步伸长到1.4米,尔后达到2.0米。经两步延伸,将使膨胀比从47.3增加到173.6。可延伸喷管将以成套组件的形式应用。如用于特殊任务,空军的兴趣集中于两步延伸喷
The U.S. Air Force and NASA have decided to use extendable nozzles on the smaller of the two solid-state engines of the inertial final rocket. In this way, the final stage of inertia will be the first to use extendable nozzle technology developed in recent years. The main nozzle of this smaller engine, which is about 0.80 meters from the throat to the exit face, uses two carbon-carbon outlet cones that come together to extend the nozzle in two steps. Each nozzle extension 0.6 meters, the first step is extended to 1.4 meters, then reached 2.0 meters. After a two-step extension, the expansion ratio will increase from 47.3 to 173.6. Extensible nozzles will be used as a kit. For special missions, the Air Force’s focus is on two-step stretch spray