though yours sounds good QD im going to stick with mine...if you look in the start of the vid if you watch the rotors you will see the vapor coming off them which only happends at very high rates of speed. though i may be wrong im still pretty sure its whats going on!!! also im pretty sure the noise of the rotors kinda gives it away that they are spinning....yes i will give that the back one is spinning but i dont think it will make that much noise.