Week 6 - Theory of Flight

The chord is:

• An imaginary straight line connecting wingtip to wingtip

• An imaginary straight line joining the leading and trailing edges of the wings

• An imaginary straight line running along the leading edge of the wing

• An imaginary straight line running along the trailing edge of the wing

What is the critical angle of attack for most airfoils?

• 17⁰

• 15⁰

• 19⁰

• 20⁰

Laminar airfoils are thickest at ___ of the chord.

• 10%

• 25%

• 50%

• 75%

The following aircraft aspect ratios are listed below. Which aspect ratio provides the greatest amount of lift?

• 5

• 10

• 15

• 20

Newton's third law of motion says

• Heat travels from a warmer to a cooler body

• When a fluid passes through a constriction, its temperature and pressure increase

• When a fluid passes through a constriction, its temperature and pressure drop and its speed increases

• If body A applies a force to body B, then body A experiences an equal and opposite force

Which of the following statements regarding wash-out of a wing is correct?

• Wash out of a wing is designed to make the root of the wing stall before the tip

• Wash out of a wing is designed to make the tip of the wing stall before the tip

• On a washed out wing, the angle of incidence is constant along the wing from root to tip

• On a washed out wing, the angle of attack at the root of the wing is smaller than the angle of attack at the tip

Spoilers:

• Decrease lift and drag

• Decrease lift and increase drag

• Increase lift and decrease drag

• Increase lift and drag

Differential ailerons: The up-going aileron will deflect ____ than the down-going aileron, causing induced yaw to ____.

• Less, decrease

• Less, increase

• More, decrease

• More, increase

As speed increases, induced drag will ____.

• Increase

• Stay the same

• Decrease

Longitudinal/pitch stability is stability around the ____

• Normal/vertical axis

• Lateral axis

• Longitudinal axis