# Principles of Flight Flashcards

1
Q

What is lift?

A

Upward force created by an airfoil moving through air

2
Q

What two reasons create lift on a wing?

A

Bernoulli’s Principal - curved wing causes lower pressure above wing
Newton’s 3rd law of motion - air striking bottom of wing is deflected down causing wing to be pushed up

3
Q

What is an airfoil?

A

Surface designed to create lift in an airflow, such as a wing, propeller, horizontal stabilizer, or rotor

4
Q

What is a chord line on a wing?

A

Imaginary line from leading edge to trailing edge

5
Q

What is the angle of attack?

A

Angle between chord line and flight path

6
Q

What are the 4 forces affecting an aircraft in flight?

A

Lift - upward force caused by airfoil
Weight - downward force caused by gravity
Thrust - forward force caused by engine
Drag - rearward force caused by resistance to air

7
Q

How do lift and weight interplay?

A

If lift is greater, you climb.
If weight is greater, you descend.
If they are equal, you stay at altitude.

8
Q

How do thrust and drag interplay?

A

If thrust is greater, speed increases.
If drag is greater, speed decreases.
If they are equal, speed is constant.

9
Q

How does temperature change as one climbs higher?

A

10
Q

How does pressure change as one climbs higher?

A

Pressure decreases as altitude increases.

11
Q

What 3 factors affect the density of the air?

A

Altitude (higher is less dense)
Temperature (warmer is less dense)
Humidity (More humid is less dense)

12
Q

What effect does density of air have on aircraft?

A

Less dense air causes longer takeoff roll, slower climb rates, reduce engine power

13
Q

What are the 3 axes of flight?

A

Pitch - lateral (swing left & right)
Yaw - vertical (rock wings)
Roll - longitudinal (seesaw forward & back)

14
Q

What control surface controls roll?

A

Ailerons

15
Q

What control surface controls pitch?

A

Elevator

16
Q

What control surface controls yaw?

A

Rudder

17
Q

What are 2 types of propellers?

A

Fixed pitch - can’t change blade angle

Variable pitch - blade angle changable

18
Q

What do trim tabs do?

A

Relieve pressure on controls

19
Q

What do flaps do?

A

Increase lift (and drag)

20
Q

What is an airfoil stall?

A

Angle of attack is too extreme causing lift to cease

21
Q

What three parts of a plane are most likely to get icing?

A

Structural (airfoil) - disrupts airflow, adds weight
Pitot-static - airspeed indicator unreliable
Carburetor - reduces airflow to the engine

22
Q

What are some types of electrical failures?

A

23
Q

What are some types of mechanical failures?

A

Landing gear, tire, flight controls, windshield

24
Q

What are some results of engine failure?

A

Loss of hydraulic power, loss of electric power, loss of pressurization, loss of altitude, forced landing