# Tag Info

Power consumption=Kinetic energy=$1/2mv^2$. Thrust=momentum change=$mv$. This is only true if the engine is perfectly efficient internally and the air is still relative to the aircraft. If the air is moving relative to the aircraft (and the engine is still perfectly efficient internally) then. Power consumption=Kinetic energy=\$\frac{1}{2}mv_e^2 - \frac{...