So, what is my axial direction? Is this direction? This is my axial direction, and this axial
direction, what is the force? This is the lift part plus or rather minus because it is the
other way the drag part which will be somewhere here. This is my thrust that is this. Is
that right? And my drag will be, sorry, the tangential force will be this. Now, I will just
change this. This thrust I wrote is an elemental thrust we have considered an element. So,
first I write D t. This D t would have been the thrust for all the blade elements. Suppose z
elements, then contribution by each element into z.