negative static stability

negative stability

negative stabilityclick for a larger image
A nose-up displacement will aggravate in situation (B). Thus (B) has negative stability.
A condition in which the aircraft tends to move away from its original position when disturbed from its original position even when external force has been removed. This is the feature of most modern combat aircraft where aircraft is unstable instead of naturally stable. This is to ensure greater agility and maneuverability. Also known as negative static stability and static instability.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved