AE 102 Lift and Drag

Question 1

A ___ ___ is a simple hinged portion of the trailing edge of the wing.

Answer 1

plain flap

Question 2

A ___ ___ is a plate that is deflected from the lower surface of the wing. It creates more drag because of the turbulent area between the flap and the wing.

Answer 2

split flap (used in T6)

Question 3

A ___ ___ is similar to a plain flap, but moves away from the wing to open a narrow slot between the flap and wing for boundary layer control.

Answer 3

slotted flap

Question 4

A ___ ___ is used on larger aircraft. It moves down to increase camber and moves aft to increase wing surface area, thus increasing lift.

Answer 4

fowler flap

Question 5

propeller output is called ___ ___

Answer 5

thrust horsepower

Question 6

engine output is called ___ ___

Answer 6

shaft horsepower

Question 7

What determines power available?

Answer 7

power produced at a given PCL setting, velocity, and density

Question 8

___ ___ is the thrust needed to overcome drag

Answer 8

thrust required

Question 9

___ ___ is the power needed to produce TR

Answer 9

power required

Question 10

What is the relationship between velocity and TR and PR?

Answer 10

TR decreases to L/DMAX then increases, PR decreases to an airspeed below L/DMAX then increases

Question 11

What happens to power required as altitude increases?

Answer 11

increases (prop. inefficiency, decreased density)

Question 12

What effect does a change in configuration have on TA and TR?

Answer 12

no effect on TA, TR increases

Question 13

What effect does a change in configuration have on PA and PR?

Answer 13

no effect on PA, PR increases

Question 14

A propeller can only accelerate air to a maximum velocity, so as velocity of the incoming air increases, it is accelerated less by the propeller, resulting in a ___ ___ ___ ___.

Answer 14

decrease in thrust available

Question 15

In the T6, the max velocity in level flight is limited to approximately ___ ___ at sea level.

Answer 15

255 knots

Question 16

If you increase weight, you have to increase lift by increasing either ___ or ___, which require an increase in ___ and ___.

Answer 16

AOA, velocity, thrust, power

Question 17

Minimum power required for level flight is at a ___ velocity than L/DMAX. Max excess power occurs at L/DMAX.

Answer 17

slower, L/DMAX

Question 18

___ ___ is the result of separation of airflow from a surface and the wake that is created by that separation.

Answer 18

form drag

Question 19

___ ___ is the difference between static pressure of the leading and trailing edges.

Answer 19

Form drag

Question 20

What is parasite drag is composed of?

Answer 20

form drag, friction drag, and interference drag

Question 21

Parasite drag ___ as velocity increases.

Answer 21

increases

Question 22

___ ___ is caused by turbulent airflow in the boundary layer.

Answer 22

friction drag

Question 23

___ ___ is generated by mixing airstreams between aircraft components, such as the wing and fuselage.

Answer 23

interference drag

Question 24

___ ___ is the component of drag that is associated with the production of lift.

Answer 24

Induced drag

Question 25

As velocity increases, induced drag ___.

Answer 25

decreases

Question 26

How does increased weight change induced drag?

Answer 26

increases

Question 27

At what velocity is induced drag greatest?

Answer 27

at slow speeds

Question 28

What is the relationship between total drag and velocity?

Answer 28

drag decreases to a point then increases

Question 29

___ ___ is a decrease in camber from the wing root to the wing tip.

Answer 29

aerodynamic twist, the root will stall before the tip

Question 30

___ ___ is a decrease in the angle of incidence from wing root to wing tip. The leading edge is gradually twisted downward so the angle of incidence at the tip is less.

Answer 30

geomatric twist, the root will always stall first before the ailerons become ineffective

Question 31

What is the lift equation?

Answer 31

L = 1/2 ρ V^2 CL S

Question 32

What three lift factors can the pilot control?

Answer 32

velocity, AOA, and shape of the airfoil (camber)

Question 33

What are the eight factors that affect lift?

Answer 33

air density, velocity, surface area, and from CL: AOA, shape of the airfoil, aspect ratio, viscosity, and compressibility

Question 34

Lift is ___ to the relative wind.

Answer 34

perpendicular

Question 35

Drag acts ___ and in the same direction as the relative wind.

Answer 35

parallel

Question 36

What is the relationship between velocity and AOA in level flight?

Answer 36

inverse relationship

Question 37

What factor changes in maintaining level flight at 1000 ft vs. 18000 ft?

Answer 37

TAS increases, decrease in density requires increase in velocity to produce the same amount of lift