I notice a trend in many aircraft designs. If the aircraft was designed to go slowly but have shorter takeoffs/landings they use airfoils with a high lift.
However for long endurance flights they use a flatter airfoil that produces less lift.
To my understanding the reason for this is because you never get anything for free. When a wing produces lift, it is trading the forward movement of the plane for vertical movement.
I understand that at higher speeds the high lift wing would fight horizontal movement too much and so they chose the flatter airfoil.
However my question is what if you change the angle of attack for the high lift wing? Pointing the front of the wing downward, thus making its lift more of a forward direction.
Would this somehow still be less efficient than a flatter airfoil or do they just chose the flatter foils for design purposes and structural reasons?