Hello guys, I am trying to calculate the lift force and drag force in a wind tunnel at my school as a part of a project that i am doing. I am varying the length of the airfoils and trying to measure the lift force and drag force. I have 3-d printed 7 airfoils. However, I am not able to find any method through which i can collect data in the wind tunnel. I tried using a force sensor but it failed as the airfoil couldn't stay stable. Can you guys help me on this? Can you guys provide any method through which I can collect data for this. Any help would be appreciated as I am pressed on time! The Wind tunnel is a typical Sub-sonic wind tunnel. The airfoils have a hole in the end which i thought I could use for measuring drag force. However, it wasn't stable at all.