Control, Flaps, Straight and Level

Question 1

more stability means

Answer 1

poor controllability

Question 2

When pushing the control column aft, the elevator goes up, and the aerodynamic force acting on the stabilizer is:

Answer 2

downward aerodynamic force. It is being pushed down therefore increainsg the nose

Question 3

The horizontal stabilizer and rudder are what kind of wing

Answer 3

symmetrical

Question 4

The strength of the tailplane-elevator depends on:

Answer 4

the force applied
the length of the arm from the CG
relative size and shape

Question 5

Stabilator or All-flying tail

Answer 5

The normal tailplane-elevator consists of a tailplane and an elevator which moves up an down. The all-flying tail completely moves.

Question 6

Adverse yaw

Answer 6

When rolling, a different drag is created in each wings. (The wing going up - more lift - more drag)
Making the aircraft yaw to the other side

Question 7

Differential ailerons

Answer 7

Help in reducing adverse yaw by creating a parasite drag on the lower wing

Question 8

Frise-type aileron

Answer 8

Increase the drag of the descending wing. The aileron lower part lowers even more creating a increased parasite drag

Question 9

Coupled ailerons and rudder

Answer 9

Causees the rudder to move automatically to reduce adverse yaw

Question 10

Crosswind Sideslipping approach

Answer 10

Yawing the aircraft to the centerline above the ground. Unless touching down soon, the aircraft will drift to the direcion of the wind, therefore you should lower the into-wind wing

Question 11

Servo tab / balance tab

Answer 11

A small portion of the end of the control surface is tilted the other way

Question 12

Anti balance tab

Answer 12

Used in all-flying tail, since change to elevatar are more harsh, these anti balance tabs here to reduce the aerodynamic force and give the pilot a “feel”

Question 13

Side effect of roll

Answer 13

Yaw

Question 14

Side effect of yaw

Answer 14

Roll

Question 15

The effectiveness of controls is enhanced at: low speed or high speed

Answer 15

High speed

Question 16

Mass balance

Answer 16

Altering the CG of the hinged control to avoid fluttering controls

Question 17

Effects of flap

Answer 17

Increased lift at lower airspeeds

Question 18

Balloon effect

Answer 18

When lowering flaps, that airplane tendenacy is to lift itself. It should be opposed with down control force

Question 19

Why does the nose changes pitch when lowering flaps

Answer 19

Because the weight-lift couple are changed, the CP moves aft

Question 20

Balloon vs pitch when lowering flaps

Answer 20

The weight-lift couple change will pitch the nose up,
the balloon will only make the airplane climb for a short time

Question 21

What happens to L/D ratio with flaps extended

Answer 21

Since lift is increased, the ratio is decreased.
The aircraft will not glide as far as it would

Question 22

Lower flap levels vs higher flaps level

Answer 22

Each flap level will increase drag, but lower flap drag will be smaller compared to higher levels

Question 23

“Lift flaps” def.

Answer 23

When the lifting capability of the wing is increased significantly for little cost in drag

Question 24

Drag flap def.

Answer 24

When the lifting capability of the wing is increased (smaller tho) but higher cost of drag

Question 25

Extending the flaps without changing power settings will make the airspeed (due to drag)

Answer 25

Decrease

Question 26

How to balance the increased drag when lowering flaps

Answer 26

Either more thrust or a steeper descent

Question 27

What happens to the stalling AoA when extending flaps

Answer 27

Being lowered. More flaps, the stall AoA is smaller

Question 28

What happens to stall speed with increasing flaps

Answer 28

Lowered. We can fly lower air speeds

Question 29

Vfe

Answer 29

Maximum flap extension speed

Question 30

4 types of flaps

Answer 30

Simple, split, slotted, fowler

Question 31

Simpe flaps

Answer 31

A flap at the trailing edge being lowered

Question 32

Split flap

Answer 32

A flap at the trailing edge that is lowered, but a small surface area above it remains the same as the wing was before

Question 33

Slotted flap

Answer 33

Air can flow in a slot between the leading edge of the flap and the wing, delaying the stall

Question 34

Fowler flap

Answer 34

Moves backwards and down

Question 35

Slats

Answer 35

A leading edge type of flap which allows air to flow through a slot between it and the wing, delaying the turbulent airflow caused at the upper surface due to high AoA

Question 36

Flaps set at takeoff level will

Answer 36

Shorten the ground run and make the climb SHALLOWER

Question 37

Lift-weight couple and thrust-drag couple canceling each other but not completely (one makes the aircraft nose up, the other noe down) what else also provides aerodynamic force?

Answer 37

The tailplane/eleavtor

Question 38

To maintain a level flight in low airspeeds we need

Answer 38

to increase the cLift, that means to increase the AoA

Question 39

When weight is reduced gradullay during flight, the lift force is stronger than the weight force. What can we do. Remember the foruma: L = cLift * 1/2rho*squared-V * S

Answer 39

Reduce speed or reduce cLift (angle of attack)
Reducing speed is preferable to maintain efficient L/D ratio