# How do I choose the correct airfoil for my UAV project? [closed]

I am not able to decide which airfoil to choose for my UAV project as I am confused. I need to lift at least 10kg of extra payload excluding the weight of the fuselage. I can afford a wingspan of 3m with a cruising speed of at least 70kmph. Also I would like to know if there is any software or application to decide the airfoil for me?

• You need to solve $L=1/2 C_L \rho V^2 A$. First determine the lift coefficient required for your airfoil based on required lift, speed and area, then select the airfoil with this $C_L$. You know you need a lift force of $10kg \times 9.81 ms^{-2} = 98 N$ for the payload. – mins Sep 24 '17 at 16:21
• You'll need the weight of the entire aircraft and fuel load to be determined with some sort of accuracy beforehand, not just your payload. Then you can find a $C_L$ range that would work. From there you can optimize the $C_D$ and $Re$ of the airfoil to suit your performance needs. – AEhere supports Monica Sep 24 '17 at 16:26
• I found few great websites for choosing the right airfoil, so pick what shape of airfoil you need, to to this website... airfieldmodels.com/information_source/… - To choose the right airfoil from a large database, go here... airfoiltools.com – SidS Dec 9 '17 at 13:28