Before anybody has the chance let me do it ...
Dear Surendra_Simrik
This video and the ones before and the website and ... and ... and Mr Vuichard have been subject of a rather interesting discussion before.
Please go
HERE.
Please read carefully what some of the more experienced members have to say.
Just a hint, what to expect. Settling with power and Vortex Ring State are two completely different things and should not be used in the same sentence. Better not even in the same thread.
Have fun.