Translated by BabelFish
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)
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.
Spoilers:ils are usable only on the ground.
Influence on the polar one: when the spoilers
leave, the Cx increase, Cz decreases, the smoothness decreases and the
stalling speed increases.