drag coefficient and power required!need help

[sadegh_865]

hi

i need to calculate the drag coefficient of a rotor bade(with two blade).infact i need to calculate the torque by drag,then power required for rotate that rotor on a fixed test stand.
who knows about what formula or chart, diagrams...

thanks in regards
sadegh

[Cyrus]

I would suggest looking through a book on helicopter aerodynamics. You might find something of use inside of it....

Then you can repost any questions you have about the equations in said book.