Force/Aerofoil

Question 1

What are the forces acting on an aircraft in flight?

Answer 1

Drag, thrust, lift and weight.

Question 2

What forces needed to be acting upon an aicraft for it to accelerate?

Answer 2

Thrust must exceed the value of drag

Question 3

What forces needed to be acting upon an aicraft for it to maintain a straight and level attitude?

Answer 3

Lift and weight must be in equilibrium

Question 4

What forces needed to be acting upon an aicraft for it to climb?

Answer 4

Lift must exceed the weight of the aircraft

Question 5

What must the aircraft do in a banked turned to remain at the same level?

Answer 5

Weight is constant but lift is lost due to the effective reduction in wing span. therefore the AoA must be increased.

Question 6

What produces a maximum glide range?

Answer 6

Flying the aicraft at its optimal angle of attack as well as its minimum drag speed Vmd

Question 7

What is the effect of weight on glide range?

Answer 7

Glide range doesn’t change with weight provided the aircraft is flown at optimal AoA and speed for that weight. It would however be faster to reach the distance with a heavier aircraft

Question 8

What is glide range proportional to?

Answer 8

Glide range is proportional to the lift drag ratio

Question 9

What is rate of climb/decsent?

Answer 9

This is the vertical component of the velocity of the aircraft. Determines the time it will take to either climb/descend from a given height.

Question 10

What is the effect of weight on rate of descent?

Answer 10

Heavier the aircraft, greater the rate of descent. A heavier aircraft will fly at a higher airspeed for a given AoA

Question 11

What is an aerofoil?

Answer 11

An aerofoil is a body that gives a large lift compared with its drag when set at a small angle to a moving airstream.

Question 12

what is an aerofoil chord line?

Answer 12

The chord line is a straight line from the leading edge to the trailing edge of an aerofoil

Question 13

What is the mean chord line?

Answer 13

The wing area divided by the wing span. Sometimes called the standard mean chord.

Question 14

What is the mean chamberline?

Answer 14

line from the leading edge to the trailing edge of equidistance on the upper and lower surface of the aerofoil.

Question 15

what is the angle of incidence?

Answer 15

Angle between the aerofoil chord line and aircrafts longitudinal datum

Question 16

What is the angle of attack?

Answer 16

Angle of attack is the angle between the chord line of an aerofoil and the relative airfow.

Question 17

What is a washout on a wing?

Answer 17

Washout is a decrease in the angle of incidence from the wing root to the wing tip. COmpensates for early stall due to higher loading t the wing tips

Question 18

What is dihedral?

Answer 18

Upward inclination of the wing form the root to the tip

Question 19

What is anhedral?

Answer 19

downward inclination of the wing form the root to the tip