Drag buildup from airfoils (strip theory)

As we move from high-level aircraft conceptual design (macro parameters like span and area) towards selecting airfoils and chord/twist distributions, we would like to improve our drag estimation. An airfoil drag buildup (strip theory) approach allows us to integrate viscous drag. This approach then reflects changes in airfoils and chord/twist (via the lift distribution).

[@brandonhicks7549]

You have the lift and drag axes swapped in your discussions around 5:30 on