Longitudinal stability

Aerodynamic Review

Published in James DeLaurier, Aircraft Design Concepts, 2022

is called the “static margin” and is commonly accepted as a measure of static longitudinal stability. In general, an acceptable range is: 0.05≤Static Margin≤0.15

Stability

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Purchase Book

Published in Rose G. Davies, Aerodynamics Principles for Air Transport Pilots, 2020

Rose G. Davies

Longitudinal stability is about the pitching moment about CG, so the position of CG will affect the longitudinal stability, which can be influenced by the pilot of the aircraft and the operational requirements. CG depends on its own weight, fuel carried, and the payload and the load distribution. The pilot will calculate the location of its CG before flight.

Actuator energy and drag minimization of a blended-wing-body with variable-camber continuous trailing-edge flaps

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Journal Information

Published in Engineering Optimization, 2020

Wei Zhao, Rakesh K. Kapania

The design variables are considered as . Considering the longitudinal stability during cruising, one of the flap rotations (), in addition to the angle of attack, can be solved from the two equilibrium equations including zero resultant pitch moment about CG and zero resultant force along the z-axis. Therefore, there is one less design variable in the flap rotations, , compared with the absolute values for all flap hinge moments, . Based on the expressions as shown in Equations (10) for the two constraints, one can easily obtain the expressions for all constraints, , as

Longitudinal stability

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Aerodynamic Review

Stability

Actuator energy and drag minimization of a blended-wing-body with variable-camber continuous trailing-edge flaps