High-Altitude Aerodynamics

Question 1

At a constant KIAS, as temperature decreases Mach Number will ___.

Answer 1

increase

Question 2

Critical Mach Number is reached when any point of the body under consideration reaches ___.

Answer 2

Mach 1.0

Question 3

The Mach number at which there is a sharp increase in drag is defined as ___.

Answer 3

Drag Divergence Mach Number (MCRD)

Question 4

Drag Divergence is also referred to as ___.

Answer 4

“Drag Rise”

Question 5

If allowed to continue, Mach Buffet could lead to Mach Tuck.

Answer 5

True

Question 6

Center of Pressure moves aft due to ___.

Answer 6

shock wave formation

Question 7

Mach Tuck is caused mainly by what factor(s)?

Answer 7

• movement of Center of Pressure

- flow separation

Question 8

A stall on a swept wing begins ___.

Answer 8

at the wing tip

Question 9

A swept wing ___.

Answer 9

increases Critical Mach Number.

Question 10

Dutch roll recovery requires ___.

Answer 10

aileron control only

Question 11

Factors that can lead to high altitude stalls are:

Answer 11

• Insufficient pilot monitoring
• Weather
• Degraded aircraft performance

Question 12

At high altitudes the difference between low speed and high speed buffet may just only be a few knots.

Answer 12

True

Question 13

An increase in altitude will improve powerplant fuel consumption performance.

Answer 13

True

Question 14

At high altitudes, the margin between Mach buffet and low speed buffet is known as ___.

Answer 14

Coffin Corner

Question 15

Due to induced drag, steep turns at low speeds require significant increase in thrust or power to maintain altitude?

Answer 15

True

Question 16

Rapid oscillations of the control surface caused by shock-induced flow separation before reaching the control surface is known as ___.

Answer 16

control buzz or flutter

Question 17

Movement about the airplane lateral axis is called:

Answer 17

Pitch

Question 18

To maintain altitude in a banked turn, the lift produced by the airplane must be:

Answer 18

Greater than the airplane weight, and the amount is a function of bank angle

Question 19

A stall is usually accompanied by a continuous stall warning, and it is characterized by:

Answer 19

• • Buffeting, which could be heavy
• A lack of pitch authority
• A lack of roll authority

Question 20

Exceed the critical angle of attack and the surface will stall and lift will decrease. This is true:

Answer 20

Regardless of airplane speed or attitude