Random 3

Question 1

Cambered wings lift more easily than flat wings. True or false?

Answer 1

True.

A high speed, low lift airfoil has very little camber and vice Vera.
An efficient camber reduces the effect of drag.

Question 2

What are the factors affecting lateral stability? (Rolling)

Answer 2

• Dihedral angle
• Sweep back
• Proper distribution of weight
• Keel effect

Question 3

What are the factors affecting longitude stability (Pitch)

Answer 3

• Location of the wing with respect to gravity.
• location of the horizontal tail surface with respect to centre of gravity.
• Area or size of the tail surfaces.

Question 4

What is wake turbulence?

Answer 4

The turbulence which is generated by the passage of an aircraft in flight.

Question 5

Factors that affect wake turbulence?

Answer 5

• Closeness to the ground
• Aircraft weight
• Aircraft wing configuration
• Aircraft speed
• Turbulence (from sources other than wake vortex)
• Wind velocity

Question 6

What are the axes of rotation for ailerons, elevators and rudders?

Answer 6

Ailerons: longitudinal

Elevators: lateral

Rudder: vertical

Question 7

What are trim tabs?

Answer 7

Trim tabs are secondary control surfaces located on the trailing edge of the ailerons, elevators and rudder. They move in opposite direction to the primary control surface it affects.

Question 8

What is the wing chord?

Answer 8

The length of the wing from the wings leading edge to the wing trailing edge.

Question 9

What are the main types of landing gear arrangements?

Answer 9

Tandem (main wing and tail are aligned on the longitudinal axis)

Tricycle (one nose wheel and two main wheels at the end of the fuselage)

Tail wheel (conventional gear. Two main wheels and one smaller wheel at the end of the fuselage)

Question 10

Increase in air density = decrease in performance.

Answer 10

False.

The denser the air the better aircraft performance.

Question 11

What are the features of a piston engine?

Answer 11

This engine cannot produce power on its own.

It produce power to a propeller which would then produce thrust.

Used in single and twin engine aircraft.

Converts chemical energy (fuel) to mechanical energy.

Question 12

What type of stability does the aileron, elevator and rudder affect?

Answer 12

Aileron: lateral stability
Elevator: longitudinal stability
Rudder: Directional stability

Question 13

With increasing airspeed the airplane requires a larger angle of attack to remain airborne. True or false?

Answer 13

False.

Increasing airspeed would been that the airplane requires a smaller angle of attack.

Question 14

What is aspect ratio and how does it relate to the wings?

Answer 14

The ratio of wing span to average chord.

Airplanes with high aspect ratio have long narrow wings (gliders, sailplanes)

Airplanes with low aspect ration have shorter wider wings (Concorde)

Question 15

What are the types of drag?

Answer 15

Parasite
Induced
Wave

Question 16

What is induced drag? When does it start and end?

Answer 16

Lift induced drag produced by the passage of the aerofoil through the air.

It is generated from the point when the nose landing gear of an aircraft leaves the ground to when the nose landing gear touches the ground during landing.

Once lift is produced by an airfoil so too is induced drag.

Question 17

Types of jet engines?

Answer 17

Turbojet
Turbofan
Turbo shaft
Turboprop

Question 18

What are the effects of wake vortex turbulence?

Answer 18

Sudden uncommanded rolling movements may occur. In extreme cases beyond the power the flying control or beyond the response of the flight crew to counteract.

Question 19

Depending on the size of the helicopter, significant wake turbulence can be generated. Helicopter wakes may be of significantly greater strength than those from fixed-wing aircraft of similar weight. True or false?

Answer 19

True.

Question 20

How long do wing tip vortices persist?

Answer 20

1 - 3 minutes.