Figure 3-1. Aileron Control

CHAPTER THREE

T-34C CONTACT

Raising Aileron

Lowering Aileron

Increases Lift

Normal Lift

Decrease Lift

Action of ailerons move the airplane

about its longitudinal axis

Figure 3-1 Aileron Control

the control stick, the right aileron surface deflects downward and the left aileron deflects upward.

The force exerted by the airflow on the deflected surfaces raises the right wing and lowers the

left wing. This happens because the downward deflection of the right aileron changes the wing

camber and increases the angle of attack and lift on that wing. Simultaneously, the left aileron

moves upward and changes the effective camber. This action results in a decreased angle of

attack and less lift. Thus, decreased lift on the left wing coupled with increased lift on the right

wing causes the airplane to roll and bank to the left.

Since the downward deflected aileron produces more lift, it also produces more drag, while the

opposite aileron has less lift and less drag. This added drag attempts to pull or veer the

airplane's nose in the direction of the raised wing; that is, it tries to turn the airplane in the

direction opposite to that desired. This undesired veering is referred to as adverse yaw.

(Figure 3-2).

Yaw

Drag

Anti

Adverse Yaw

Yaw

Rudder Correction

Figure 3-2 Adverse Yaw

3-2

USE AND EFFECT OF CONTROLS