Post on 31-Jul-2020
Ir. Nando Timmer
Li# curve slope
Introduc)on to Aeronau)cal Engineering
Erwin Vorenhout -‐ CC -‐ BY -‐ SA 3.0
Effect of a finite wing
V∞
Geometric angle of a?ack
αi
αeff
α Local flow direcDon
Induced angle of a;ack
For a general wing: This angle is in radians. For angle in degrees:
Li# curve
LiH coefficient
α
a0
a
From thin airfoil theory:
αi
Li# curve slope
Summary
Drag equaAons
Wing
EnAre aircra#
Oswald factor
Li#-‐curve slope
Erwin Vorenhout -‐ CC -‐ BY -‐ SA 3.0