Aerodynamics​

Question 1

What is an Aero Foil.

Answer 1

A aero foil is a structure designed to generate lift from the passing airflow

Question 2

What is the Chord Line.

Answer 2

Imaginary straight line joining the leading and trailing edge​.

Question 3

What is the Mean Camber Line.

Answer 3

Line at equal distances from the upper and lower surface.

Question 4

What is the Camber.

Answer 4

Distance between the Chord Line and Mean Camber Line​

Question 5

What is the Angle of Incidence.

Answer 5

Angle between the chord line and longitudinal axis of the aero plane.

Question 6

What is the Angle of Attack.

Answer 6

Angle between the chord line and the relative airflow.

Question 7

What is the Wingspan.

Answer 7

Distance from wing tip to wing tip.

Question 8

What is the Wing Taper.

Answer 8

Wing that has a smaller chord line at the tip than at the root.

Question 9

What is the Sweepback.

Answer 9

The wing tip is behind the wing root.

Question 10

What is the Mean Aerodynamic Chord.

Answer 10

Chord of an imaginary rectangular wing, used to do calculations for aircraft performance.

Question 11

What is the Aspect Ratio.

Answer 11

Ratio of the wing span to the chord = Span2 / Area​.

Question 12

What is the Wing Dihedral.

Answer 12

Wing tips are higher than wing roots, assists lateral stability of the aero plane.

Question 13

What is the Wing Anhedral.

Answer 13

Wing tips are lower than wing roots.

Question 14

What is the Wash-out.

Answer 14

Wings are twisted so that the Angle of Incidence at the tip is less than at the wing root.

Question 15

What is the top of the aero foil called.

Answer 15

Upper Surface.

Question 16

What is the bottom of the aero foil called.

Answer 16

Lower Surface.

Question 17

What is the front of the aero foil called.

Answer 17

Leading Edge.

Question 18

What is the back of the aero foil called.

Answer 18

Trailing Edge.

Question 19

What is the Wing Root.

Answer 19

The base of the wing.

Question 20

What is the Wing Tip.

Answer 20

The tip of the wing.

Question 21

How do you calculate Wing Area.

Answer 21

Span X Chord.

Question 22

How to calculate Wing Loading.

Answer 22

Weight/Wind Area.

Question 23

How to calculate Aspect Ratio.

Answer 23

Span/Chord.

Question 24

What direction does Relative Airflow go in relation to the plane.

Answer 24

Backwards.

Question 25

What direction does Flight Path go in relation to the plane.

Answer 25

Forward.

Question 26

What three things does the size of the Total Reaction depend on.

Answer 26

Airspeed. Size. Angle.

Question 27

What is the Centre of Pressure​.

Answer 27

The position at which the average resultant force acts.​ This is the point about which all of the pressures are evenly distributed​ It is NOT a fixed point​ It changes position as the pressure distribution changes in response to changes in AoA​.

Question 28

What are four factors that affect lift.

Answer 28

Airspeed. Size. Angle. Camber.

Question 29

How do you calculate Angle of Attack.

Answer 29

The AOA is measured by using the pressure difference between the two orifices. The magnitude of the pressure difference depends on the shape of the nose of the tube and the angular position of the orifices.

Question 30

How do yo calculate Lift.

Answer 30

Lift = Coefficient of Lift(CL) X 1/2 Air Density(P) X Velocity of Aircraft(V)^2 X Surface area of the wing(S).​​

Question 31

How do you calculate Drag.

Answer 31

Drag = Thrust = Coefficient of Drag(CD) X 1/2 Air Density(P) X Velocity of Aircraft^2 X Surface area of the wing(S).

Question 32

How does drag move compared with relative airflow.

Answer 32

In parallels.

Question 33

How many categories of drag are there and how many types of drag are there.

Answer 33

2 Categories. | 4 Types.

Question 34

What drag increases as Angle of Attack Increases.

Answer 34

Induced drag.

Question 35

What drag increases as airspeed increases.

Answer 35

Parasite drag.

Question 36

What drag increases as airspeed deacreases.

Answer 36

Induced drag.

Question 37

How do winglets work.

Answer 37

Winglets increase an aircraft's operating efficiency by reducing what is called induced drag at the tips of the wings. An aircraft's wing is shaped to generate negative pressure on the upper surface and positive pressure on the lower surface as the aircraft moves forward.

Question 38

How do winglets work in relation to Bernoulli's principle.

Answer 38

In general, the wing's upper surface is curved so that the air rushing over the top of the wing speeds up and stretches out, which decreases the air pressure above the wing. In contrast, the air flowing below the wing moves in a straighter line, thus its speed and pressure remain about the same.

Question 39

What does positive dynamic stability mean for an aircraft.

Answer 39

Positive dynamic stability is the tendency of an aircraft to dampen toward original position once disturbed.

Question 40

What are the 2 categories of drag.

Answer 40

Induced drag. | Parasitic drag.

Question 41

What are the 4 main types of drag.

Answer 41

Induced drag. Skin friction drag. Form drag. Interference drag.

Question 42

What is induced drag.

Answer 42

Induced drag is affected by lift more accuratly the angle of attack.

Question 43

What is Skin friction drag.

Answer 43

Results from frictional forces existing between an object and the air through which it is moving.

Question 44

What is Form drag.

Answer 44

Caused when airflow separates from the surface, forming eddies which disturb the streamline flow

Question 45

What is Interference drag.

Answer 45

Caused by mixing or “interference” of converging airflow at the junctions of various surfaces (wings to fuselage)