I doubt this qualifies as a drill, but, it's something that was "drilled" into me at Halton by a certain Flt Lt John Potter, our erstwhile Airframe Science instructor.
1/2 Rho Vsquared S CL , where Rho is air density measured in Slugs per cubic foot, .0024 comes to mind. Vsquared obviously the velocity squared, s being the surface area of the mainplane and CL being the Coefficient of Lift for that aero foil profile. It allows you to work out the lift for a wing. Amazing for me at 15+ years old.
Smudge