The Encyclopedia of Aerodynamics by Hitchens Frank;

Author:Hitchens, Frank;
Language: eng
Format: epub
Tags: aerodynamics, aircraft, aeroplane, airplane, reference, diagrams, flight, lift, pilot, engineering, helicopter, technical, subsonic, supersonic, propeller, aeronautics, history
ISBN: 4460976
Publisher: Andrews UK Ltd.
Published: 2015-11-02T00:00:00+00:00

Manoeuvre speed (VA) The manoeuvre speed VA has been commonly stated as the ‘maximum speed at which an abrupt and full control deflection can be made without overstressing the aircraft’.

The VA manoeuvreing speed is related to the limit load factor and VS1, the flaps up stall speed where VA for normal category aircraft equals the square root of 3.8 times VS1 or nearly twice the stall speed. The manoeuvreing speed is stated in the aircraft’s flight manual for the maximum all up weight and limit load factor. At aircraft, weights below the maximum all up weight the VA speed decreases. Flying at a speed below VA and inducing a rapid pitch up will stall the aircraft and relieve the loading before the aircraft is overstressed. A rapid pitch up when flying above the manoeuvreing speed could lead to overstressing of the airframe. The manoeuvreing speed is the maximum speed to be used when flying in turbulence to avoid structural damage caused by wind-gust induced loads.

The manoeuvre speed can be calculated from the following:

VA = VS1√n limiting ‘g’

Where VA

=

manoeuvre speed

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