zero-length launcher

zero-length launcher

[′zir·ō ¦leŋkth ′lȯnch·ər]
(ordnance)
A launcher that holds a vehicle in position and releases the rocket simultaneously at two points so that the buildup of thrust, normally rocket thrust, is sufficient to take the missle or vehicle directly into the air without need of a takeoff run and without imposing a pitch rate release.