AviationTire› Principles Of Flight - Aeroplane ›Subsonic Aerodynamics ›Means to decrease the CL - CD ratio, increasing drag Q 4 / 5 ▾
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Upon extension of a spoiler on a wing:

only CL is decreased (CD remains unaffected).
CD is increased and CL is decreased.
both CL and CD are increased.
CD is increased, while CL remains unaffected.