So, highly non-linear nature of flow is there, we are trying to design a propeller there. So, by
certain, adaptations of certain features in the stern it is possible for us to design the so called
Isowake-lines, radially, concentric to the propeller axis. That is, if I take an axis here, I can
have more or less a constant velocity- not exactly- but more or less. But if I take an axis a
little away it will, it may also be constant, but it will be different from here- am I clear? Now,
for that, so, if I have got say a speed which is I call VA1 and a speed here which I called VA2,
then the design of my blade section here to utilize this velocity will be slightly different from
the design of the blade section from here, and what is the design I am talking about? Mainly,
pitch. So, I design a pitch here so that if this VA1 must prevalent everywhere