Now, I have this aerofoil section here- can you see this is, is it visible or not?- so, you have
the aerofoil section here, you have this base line here, it could be the nose tail line also, and
the water is falling at an angle alpha. The property of aerofoil section is that when the water
falls at a small angle there is a force generated perpendicular to flow of water that is, if the
water is falling like this, then there will be a lift force perpendicular to this- this is called lift.
Can you understand that