Revert f0b061b..7be1f9d

This rolls back to commit f0b061b7d2f70dfcb3dd522c4f98994d46626611.
Use NACA 2811

I realized I wasn’t using the correct parameters, and so I’ve adjusted
them as follows:
C_L_eff = 0.70
Mach_perpendicular = 0.68
(t/c)_perpendicular = 0.107
C*_p = -0.87