AE 106 Stalls Flashcards

1
Q

Thin layer of air near surface of airfoil where streamlines demonstrate local retardation due to viscosity

A

Airfoil Boundary Layer

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2
Q

primary producer of lift

A

laminar flow

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3
Q

produces only minimum lift

A

turbulent flow

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4
Q

What are the characteristics of boundary layer airflow from the forward edge to the max point of thickness?

A

laminar flow, high to low pressure, airflow accelerates, kinetic energy builds, high boundary layer surface adherence

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5
Q

What are the airflow characteristics of boundary layer airflow from max point of thickness to trailing edge?

A

laminar to turbulent flow, low to high pressure, adverse pressure gradient, decreasing boundary layer adherence

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6
Q

Caused by low pressure behind max point of thickness

A

adverse pressure gradient

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7
Q

how is adverse pressure gradient controlled?

A

kinetic energy of the relative wind

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8
Q

What is the impact of a high AOA on the boundary layer?

A

kinetic energy decreases, adverse pressure gradient increases, boundary layer separation point moves forward on the airfoil

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9
Q

define boundary layer separation

A

point in streamline where airflow no longer adheres to the airfoil

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10
Q

Where is the point of beginning boundary layer separation?

A

CL is no longer linear on CL vs. AOA curve

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11
Q

Where does a stall occur?

A

CLMAX

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12
Q

Define stall

A

increase in AOA results in decrease in CL

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13
Q

stall ___ remains constant for any given airfoil, and stall ___ is variable based on conditions.

A

AOA, airspeed

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14
Q

for a power-off stall: stall airspeed: ___, stall warning: ___ __ ___, roll tendency: ___ due to engine mounting 1 degree right and 2 degrees down from centerline

A

higher, closer to stall, right

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15
Q

Power-on stall: stall airspeed: ___, stall warning: ___ ___ ___ ___, roll tendency: ___ due to torque effect

A

lower, further above stall airspeed, left

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16
Q

What are the two differences between power-on and power-off stalls?

A

Vertical component of thrust (increases lift and lowers stall airspeed), propeller acceleration factor (increases airflow rate, lower stall airspeed)

17
Q

What is the order of loss of control effectiveness?

A

Aileron, Elevator, Rudder

18
Q

What factors affect stall airspeed?

A

gross weight, altitude (air density), load factor

19
Q

How does weight effect stall speed?

A

higher weight = higher stall airspeed

20
Q

___ stall airspeed increases with altitude and ___ stall airspeed remains the same

A

true, indicated

21
Q

A ___ ___ ___ deflects high kinetic energy airflow from bottom of wing to top of wing to suppress boundary layer separation

A

boundary layer control decive (BLC)

22
Q

What are the benefits of boundary layer control?

A

increased maneuverability, decreased landing speed and distance

23
Q

power-off stall warning occurs approx ___ knots before stall

A

3

24
Q

stick shaker provides stall warning ___ to ___ knots before power-off stalls, ___ to ___ units AOA

A

5 to 10, 15 to 16