So, let us get back to our propeller. This is the one that we have to looking at. Water is falling
like this, perpendicular to this you get a force like that, trying to push this propeller- can you
understand that?- lift is coming like this and drag will be in, if the water is flowing like this,
drag will be this way- there will be a drag in the same direction, but lift in the opposite
perpendicular direction. So, if you look at this lift, which is going like this, most of its
component is in the axial direction; if I now compute it, one is this direction, one is in this
direction, most of it is this way because perpendicular to, perpendicular is very, making very
small angle to the axis of the propeller.