Mod 11 - FD

Question 1

What is Adverse Yaw?

Answer 1

• Adverse yaw is caused when the A/C rolls on way and yaws in the opposite direction.
• If an A/C banks left, the right wing will have higher induced drag, and the left wing will have higher profile drag. At slower speeds, the drag on the downgoing wing (right wing) will have higher drag than the upgoing wing (left wing) causing the A/C to yaw in the opposite direction.
• 1: Differential Airleron: This is when the downgoing aileron deflects less than the upgoing.
• 2: Frise Ailerons: The upgoing wing aileron leading edge will protrude into the airflow causing profile drag.

Question 2

Whats a Frise Aileron?

Answer 2

• A Frise Aileron is an aileron which helps make profile drag to prevent adverse yaw. On the upgoing wing during a bank, the leading edge of the aileron on this wing will protrude into the airflow causing profile drag, thus preventing adverse yaw.

Question 3

What are Spoilers and Lift Dumpers?

Answer 3

• Spoilers are deployed when ‘weight on wheels’ micro switch is activated, significantly improving drag to slow the aircraft down on the ground.
• Lift dumpers are devices which created drag during flight which signifficantly helps reduce lift and helps loss of altitude. Selected using the speed break lever.

Question 4

Split flap details/drawing?

Answer 4

• A split flap increases mean camber of the wing.
• It creates 60% extra lift.
• Nose down pitch moment.

Question 5

Vortex Generators Explination?

Answer 5

• Small plates or wedges projecting up from the aerofoil surface.
• Protrude 3x the boundry layer or 25mm.
• They help re-energize the air.
• They create small vorticies.

Question 6

Subsonic/Supersonic Condtion.

Answer 6

Draw diagrams.

Question 7

Name Primary Aircraft Structures and effects of loosing one of these structures.

Answer 7

1 - Floor Members
2 - Frames
3 - Main spars
4 - Engine Mounts