Angle of Incidence Checking

The angle of incidence of a wing is the angle formed by intersection of the wing chord line and the horizontal axis of the aircraft.

Checking and adjusting angle of incidence

1. Leveled the fuselage.
2. use incidence Board.

Note: Same in dihedral checking.

Washin and Washout

Washin and washout are employed to give the wings on each side of an aircraft a slightly different amount of lift in order to aid in couteracting the effect of engine and propeller torque.

• Washin is an increase in the angle of incidence of the wing from the root to the tip. An angle of incidence 2 degrees at the root and angle of incidence of 3 degrees ate the outer end, it has a washin 1 degrees
• Washout is a decreasing angle of incidence from the root to the tip of a wings.washout is also used to provide improved stall characteristics.