Ch 13 - Stalling Flashcards

1
Q

Low Speed Stall

A

Caused by excessive AoA

  • Boundary layer separates earlier as it no longer has the energy to stay on as the adverse pressure gradient is high
  • Lift can no longer keep up with demand = Lift collapse

TO recover, reduce AoA

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2
Q

The Effective Airflow

A

The Aerofoil only cares about the Effective AoA

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3
Q

Rectangular Wing Stalling Characteristics

A

Elliptical Lift distribution
Increased vortices at the tips
CL highest at the root

Roots stall first as they reach the critical AoA first
They provide stall warning felt as light/heavy buffet
No violent wing drop

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4
Q

Elliptical Wing Stall Characteristics

A

Decreased wing tip vortices
Trailing edge vortices are consistent

Whole wing will stall together
Potential violent wing drop

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5
Q

Moderately Tapered Straight Edge wing stall characteristics

A

Wing is efficient
Stalls in the middle of the wing first
Can be violent

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6
Q

Swept Wing and highly tapered wing stall characteristics

A

Tips work harder than root
No stall warning
Bad wing drop
CofP moves Fwd -> Pitch up -> increased downforce from HS ->more pitching up ->unstable aircraft

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7
Q

Deep Stall (Locked in Stall)

A

Horizontal stabiliser will no longer produce downwash to pitch the nose down

  • Stick pusher will kick in and force aircraft nose down or to limit it rising too far
  • Airbus wont allow you to get to that point
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