Tips on measuring Lift + L / D for wing sections?

Does anyone have any tips for measuring lift, drag, and / or L/D to test modifications to wings?

I am looking for something that doesnt quite require building a wind tunnel etc., while allowing for reasonable measurements.

CFD simulation in open-source software like OpenFOAM?

haha funny you mention that. i actually have an openfoam tutorials youtube channel. CFD gives answers, but you cannot guarantee accuracy without … testing

Can you share the link?

sure, though i havent been uploading videos lately: