Could you recommend airfoil that has greatest Clmax(coefficient of lift) ?

Question

we're building UAV(unmanned aerial vehicle) so need to choose airfoil type for that. we're thinking of NACA airfoils that has 4 digits.

any help would be appreciated

Answer 1

this might help:

"The two vehicles wings which were optimised were based upon assumptions made on the Northrop Grumman Global Hawk (GH), a High Altitude Long Endurance (HALE) vehicle, and the General Atomics Altair (Altair), Medium Altitude Long Endurance (MALE) vehicle. The optimisations for both vehicles were performed at cruise altitude with MTOW minus 5% fuel and a 2.5g load case. The GH was assumed to use NASA LRN 1015 aerofoil at the root, crank and tip locations with five spars and ten ribs. The Altair was assumed to use the NACA4415 aerofoil at all three locations"

Answer 2

The blended body concept is right up there