So, the pressure would let me draw with a green. There will be a change in pressure at the disc itself. Am I understood? That is, as if the propeller disc is providing a high pressure across itself, therefore the velocity is increasing. It is pulling the pressure from one side. What is the meaning of pulling? A plane pressure. So, a pressure change occurs across the disc. So, because of change in velocity, the pressure drops here. There is a pressure change here; pressure increases tremendously. Then again pressure drops and velocity increases. This is what happens.