High-Altitude Aerodynamics Flashcards
At a constant KIAS, as temperature decreases Mach Number will ___.
increase
Critical Mach Number is reached when any point of the body under consideration reaches ___.
Mach 1.0
The Mach number at which there is a sharp increase in drag is defined as ___.
Drag Divergence Mach Number (MCRD)
Drag Divergence is also referred to as ___.
“Drag Rise”
If allowed to continue, Mach Buffet could lead to Mach Tuck.
True
Center of Pressure moves aft due to ___.
shock wave formation
Mach Tuck is caused mainly by what factor(s)?
- movement of Center of Pressure
- flow separation
A stall on a swept wing begins ___.
at the wing tip
A swept wing ___.
increases Critical Mach Number.
Dutch roll recovery requires ___.
aileron control only
Factors that can lead to high altitude stalls are:
- Insufficient pilot monitoring
- Weather
- Degraded aircraft performance
At high altitudes the difference between low speed and high speed buffet may just only be a few knots.
True
An increase in altitude will improve powerplant fuel consumption performance.
True
At high altitudes, the margin between Mach buffet and low speed buffet is known as ___.
Coffin Corner
Due to induced drag, steep turns at low speeds require significant increase in thrust or power to maintain altitude?
True
Rapid oscillations of the control surface caused by shock-induced flow separation before reaching the control surface is known as ___.
control buzz or flutter
Movement about the airplane lateral axis is called:
Pitch
To maintain altitude in a banked turn, the lift produced by the airplane must be:
Greater than the airplane weight, and the amount is a function of bank angle
A stall is usually accompanied by a continuous stall warning, and it is characterized by:
- Buffeting, which could be heavy
- A lack of pitch authority
- A lack of roll authority
Exceed the critical angle of attack and the surface will stall and lift will decrease. This is true:
Regardless of airplane speed or attitude
