TAF
A
Driven region
Lift
A Drag
Total aerodynamic force aft of axis of rotation
Rotational relative wind AOA = 2° Drag
Driven region
RW Resultant Inflow up through rotor TAF
B&D
Point of equilibrium
Chord line
Lift
B
Autorotative force
Equilibrium
Drag
Inflow
C
Driving region
TAF
C Lift Total aerodynamic force forward of axis of rotation AOA = 6°
Driving region
Point of equilibrium
Drag
D
Inflow E
Stall region
Axis of rotation
E
AOA = 24° (blade is stalled) Lift TAF
Drag Drag Inflow
Figure 2-47. Force vectors in vertical autorotation descent.
2-26
Stall region