At 5:48 , when the curve arrow is drawn, it indicates a pitch up moment which is called Cm0. Considering a stable wing in the case under consideration, shouldnt the arrow be rotating downwards That is Cmo is also negative and contribution of cmalpha * alpha is also negative?
Yes, but as per convention we denote the moment in the clockwise (+ve) especially in the diagram, since the cm0 is negative we know it is anti-clockwise(-ve), it is just an assumption that it is clockwise(+ve).
Excellent explanation sir... Thank you so much
Missed 'S' @ 19:50
what is meant by a reflex airfoil? 9:35
At 5:48 , when the curve arrow is drawn, it indicates a pitch up moment which is called Cm0. Considering a stable wing in the case under consideration, shouldnt the arrow be rotating downwards
That is Cmo is also negative and contribution of cmalpha * alpha is also negative?
Yes, but as per convention we denote the moment in the clockwise (+ve) especially in the diagram, since the cm0 is negative we know it is anti-clockwise(-ve), it is just an assumption that it is clockwise(+ve).
@@sushaanthsureshkumar2126 What
Thanks sir
sir, why didn't u add Cmac,w in the expression of Cm alpha?
9:31 ? Positive? or Negative?
Inviaz we cannot trim the arc with + AOA, as according to graph cm is never zero for positive aoa.
missed S @19.48
how Cmac is negative?
Cmacw is not negative, it gives nose up moment since cg of the aircraft is behind of it