Yes it does, it does, it does. So, it is not a very well geometrically defined surface, what
ultimately it comes down to is it is nearest to a helicoidal surface, but not exactly helicoidal
surface particularly, the helicoidal surfaces curvatures themselves vary if I have got a varying
pitch- am I clear ? So, what I was telling is if this is the case, then how do I define my pitch?
After all for a propeller, like we have defined an average velocity VA, then we must define an
average pitch so that I can define my propeller for some simple calculations and that pitch is
defined like this.