I have a requirement of plotting Thrust available, Thrust required V/S velocity as we plot for a aircraft i want to do a similar thing for a hexacopter. so that i can show what is the max speed i have to fly. but i am not able to find any reference how should i measure drag of the hexacopter wrt to velocity. I know that for lower speeds the drag is proportional to velocity due to momentum drag and as velocity increases the bluff body drag takes over. but is their any way i can have a equation which i can use to plot this thrust required graph.
Hello @prashant_s_s welcome to the community,
Please take a look at the wind estimation documentation.
Thanks for reply @amilcarlucas really it means a lot.
I went trough the documentation and the video. But i still have a some doubt.

I can see that for calculation of ballistic coefficient they have used the drag coefficient to be 1.So i could have a rough estimate of bluff body drag with the help of this. Using the formula
Bluff Body Drag=dynamic pressurefrontal areadrag coeff

But after i estimate EK3_Drag_MCOEF from log how do i use this to calculate the the momentum drag for other velocities. Since its a scaled factor of k from the formula , Momentum Drag=airspeed*(1k)*mass flow rate trough rotor.
I cant directly use this EK3_Drag_MCOEF here right?