Because of its rapid increase with increasing airspeed parasite drag is predominant at high speeds. At lower speeds, near a stall for example, induced drag predominates due to high lift production. As mentioned earlier, when the airspeed doubles the parasite drag fourfolds. This is proved by the same formula that applies to lift, namely:
Where C(d) stands for the drag coefficient and depends on the shape of the aircraft and the angle-of-attack. Rho stands for the air density while S stands for the total area.