static instability

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.
References in periodicals archive ?
Sticking the landing To compensate for its static instability, the researchers' robot relies on some ingenious engineering.
Topics include: two-phase oscillatory thermal-hydraulic instability, oscillatory flow stability boundary, static instability, thermal-acoustic oscillations in heated channels, instability of condensing flows, and cases of flow instability in pipelines.
The budget funds 95 construction projects, consisting of 10 dam safety assurance, seepage control, and static instability correction projects; 20 projects justified on the basis of life-saving benefits; six project completions; two new starts; and 57 other continuing projects.