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SkyWest Interview Gouge (High Alt Aerodynamics) Questions with correct Answers
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SkyWest Interview Gouge (High Alt Aerodynamics) Questions with correct Answers How does stalling speed change with altitude? Stall speed INCREASES with higher altitude Why does stalling speed increase with altitude? Thinner air More airflow needed to generate same amount of lift W...

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  • August 11, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • skywest interview gouge high alt aerodynamics qu
  • how does stalling speed change with altitude stal
  • why does stalling speed increase with altitude th
  • what is mach speed speed in relation to speed of

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SkyWest Interview Gouge (High Alt
Aerodynamics) Questions with correct
Answers
How does stalling speed change with altitude? - answer Stall speed INCREASES
with higher altitude

Why does stalling speed increase with altitude? - answer Thinner air
More airflow needed to generate same amount of lift

What is Mach Speed? - answer Speed in relation to speed of sound

What is relative Mach Number? - answer Ratio of the speed of aircraft to the speed
of sound.

Mach 0.8 means the plane is flying at 0.8 times the local speed of sound at that ambient
temperature

What is critical Mach? - answer The airspeed at which air ANYWHERE around the
aircraft reaches the speed of sound.

Airflow above the wings can accelerate and reach the speed of sound

What is high altitude Mach Buffet? - answer When airflow goes supersonic over your
wing and then slows down to subsonic towards the training edge of the wing.

Causes a shock wave and turbulent air behind the wing which causes a buffet.

What is Mach Tuck? - answer As an aircraft approaches the speed of sound its wing
center of pressure moves aft. As it moves aft, it creates a pitch down moment which
there by increases airspeed and worsens situation. Can be unrecoverable and exceed
the aircraft limitations.

Center of lift moves farther aft the more you speed up

What is MMO? - answer Max Mach Number

Just below critical Mach (supersonic flight)

What is the coffin corner? - answer The region where the aircrafts stall speed is very
close to the aircrafts MMO (Max Mach speed) by the aircrafts max ceiling.

, Any slower, the aircraft will stall. Any faster the aircraft will exceed MMO and critical
Mach.

What happens to your stall speed as you climb? Why? - answer Stall speed
increases with altitude.

Air becomes less dense and wings need more airflow to generate same amount of lift

Does the speed of sound change based off of temperature? - answer Yes. Colder
temps cause speed of sound to decrease.

As you climb up to higher altitudes with colder temps, speed of sound decreases.

What happens if you keep climbing without leveling out? - answer You will reach the
"coffin corner".

As you climb, stall speed and MMO will eventually reach the same point.

Why do jets have swept wings? - answer Swept wings allow us to delay the
supersonic flow and raise the critical Mach Number.

*Tricking wing to think it's flying slower than it actually is*

What are the two components of airflow that is created with a swept wing? - answer
Chordwise - travels perpendicular to leading edge

Spanwise - moves parallel to the leading edge

Does the chordwise flow accelerate? - answer Yes.

Chordwise is less than the total amount of airflow, we are only accelerating part of the
air!

*Allows us to fly faster without supersonic flow*

What does the spanwise flow do? - answer Spanwise component stacks up. Makes
wingtip feel like it's flying at a slower airspeed then it actually is.

On a sweptwing, what part of the wing stalls first? Why? - answer Wingtip.

The spanwise flown"builds" up which makes it feel like it's at a slower airspeed.

*When wings begin to stall, you lose aileron effectiveness*

What's the cons of a sweptback design? - answer Flying at slower airspeeds (bad
low speed performance)

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