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A site on Aerodynamics

Translated by BabelFish

Theory
Le Cx et le Cz
Air Brakes
Effet de flèche

Buts:Diminuer speed in approach, with the landing or in acceleration stop. For that, it is necessary to increase the trail of the profile of the plane; the air-brakes will be thus panels which one will leave the flow of symmetrical air of way (often bored holes to increase the surface of friction with the air)

They can be situés:sur or under the fuselage, in the cone of tail or on the wings. In this last case, if it sagit of the suction face, they will be assembled on small legs not to disturb Fz.

Traditional air-brakes:

Brakes

Influence on the polar one: when the air-brakes leave, the Cx increase, Cz remains constant, the smoothness decreases but the stalling speed does not vary bus Czmax is constant.

Brakes

Spoilers:ils are usable only on the ground.

Brakes

Influence on the polar one: when the spoilers leave, the Cx increase, Cz decreases, the smoothness decreases and the stalling speed increases.

Freins

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