Theory of Flight

Question 1

Parasite Drag

Answer 1

• Drag produced by any surface that does not produce lift
• Friction and streamlined design

Question 2

Induced Drag

Answer 2

• High pressure air wants to go to low pressure air
• Air curls up and over the wing causing wingtip vortices

Question 3

Wingtip Vortice Directions

Answer 3

• Left wingtip is clockwise
• Right wingtip is counter-clockwise

Question 4

Stall Strips, Wing Fences, and Washout

Answer 4

Improves Stall Characteristics

Question 5

Servo Tab

Answer 5

Moves opposite direction to control surface

Question 6

Anti-Servo Tab

Answer 6

Moves same direction as control surface

Question 7

Causes of Undesired Yaw

Answer 7

• Adverse Yaw (Aileron Drag)
• Propeller Torque
• Asymmetric Thrust / P-Factor
• Gyroscopic Precession
• Slipstream

Question 8

Centre of Pressure

Answer 8

• Shifts forward as angle of attack increases
• Shifts drastically backward after critical angle is exceeded