Before revision: Air drag The power needed to overcome air drag or resistance is: in still air, or in a headwind, where is the air density, which is about 1.225 kg/m^3 at sea level and 15 deg.
After revision: Air drag The power needed to overcome air drag or resistance is: in still air, or in a headwind, where is the air density, which is about 1.225 at sea level and 15 deg.