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The most common one is the Longer Path Theory.

Many theories have been developed on how a wing generates lift. Reynolds No, Boundary Layer Transition and surface roughnessĪn airfoil designed for minimum drag and uninterrupted flow of the boundary layer is called a laminar airfoil.Laminar Flow Airfoils **The tendency for flow to leak around the wing tipsgenerally cause streamlines over the top surface ofthe wing to veer to the wing root and streamlinesover the bottom surface veer to the wing tips.Įndplates (winglets) at end of wing reduces tip vortex If planes height is not changing then: Lift = WeightĪp and c are independent of CL =L/(1/2 V2Ap)Ī10Camber line is straight for symmetrical aerfoilĪs angle of attack increasesstagnation point moves downstream along bottom surface, causing an unfavorable pressure gradient at the nose*. Forces on airplane atlevel speed and constantheight and speed.Lift force is the component of R that is perpendicular tofree stream velocity, and drag is the component of R parallel to the free stream velocity.