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A technique in which the vehicle is free as soon as it is launched from the aircraft launcher or surface launcher. Aircraft rockets are normally not a zero-length launch, as they accelerate within the tube or along the rail but would be zero-length if they were hung on clips. A surface launch is a zero-launch if the thrust away is by a rocket boost motor whose vertical component is greater than the weight.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved