REFLECTOR: NACA Outlet

[Jack Prock]

I know a NACA scoop inlet is the best for least resistance for an inlet, I
am wondering what the best way
is to have an outlet. I am building the oil cooler in the nose and making
the outlet on the bottom of the fuselage.
Is there a NACA outlet? Is it best to just have a rear facing pipe? Or a
hole in the fuselage that air get pumped out?
Does it matter? I would think that any air flow perturbations would cause
drag? Anyone have any thoughts on this?

Jack Prock