Module 2 Theory of flight

Question 1

Atmospheric composition or AIR

Answer 1

-Nitrogen=78%
-Oxygen=20%
-Argon= 1%
-Carbon dioxide =0.04%
and small amount of other gases

Question 2

Air is a gas, gases have various properties named them

Answer 2

• Pressure
• Temperature
• Mass
• The volume which contain the gas

Question 3

Boyle’s law

Answer 3

pV=C

If temperature of the gas is held constant(temp), The absolute pressure is inversely proportional to the volume

Question 4

Charles’ law

Answer 4

If the temp increases volume also increases in order to maintained the same constant ( pressure)

Question 5

Density

Answer 5

Mass of an object divided by its volume

Question 6

What will happen to the density of air when temperature increases?

Answer 6

When the temperature of air increases, the density of that air will decrease

Question 7

International Standard Atmosphere

(Sometimes referred to as Standard Day

Answer 7

• Atmospheric pressure of
  29. 92 In Hg (or 14.7psi)
• With a surface temperature of 15 ºC
• At sea level

Question 8

Four forces acting on an Aircraft/

Answer 8

• Lift = or >Weight

- Thrust = or > Drag

Question 9

What is Lift?

Answer 9

Lift is a mechanical force, Lift is generated by the difference in velocity between the solid body and the fluid

Question 10

Newton’s second law of motion states that a force is produced when

Answer 10

A mass is accelerated.
F= m*a
Acceleration is a change in velocity over time.
F= m * ΔV / Δt

Question 11

Factors That affect Lift ?

Answer 11

-The object= shape and size
-The motion=Velocity and inclination to flow
The air= mass, viscosity, compressibility

Question 12

What is Drag ?

Answer 12

The resistance of the air to the motion of the aircraft,drag is directed along and opposed to the direction of flight.

Question 13

Inter fence Drag is ?

Answer 13

Interference drag is incurred as one surface interferes with another in relationship to airflow

Question 14

Parasite Drag is ?

Answer 14

The sum of all the drags not directly associated with the development of lift; such as friction, form and interference

Question 15

Induce drag is?

Answer 15

Is commonly referred to as the drag produced by lift itself.

Question 16

Total drag is ?

Answer 16

The sum then of all parasitic drag and all induced drag i

Question 17

Skin friction Drag

Answer 17

Reaction to the retardation of the flow within the boundary layer is skin friction drag.

Question 18

Winglet devise is used to control?

Answer 18

Winngtip vortices and use them to make the wing more efficient.

Question 19

Ground Effect?

Answer 19

Ground effect is caused by ground interference with airflow patterns around an aircraft when the aircraft is within one wingspan of the ground. At too high of an approach speed the aircraft may float down the runway and run out of runway length