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PPL - PoF > Stability > Flashcards

Stability Flashcards

1
Q

What is static stability

A

Ability of aircraft to self correct for upsets

The tendency of an aircraft to return to a condition of steady flight by itself after a disturbance

Link here

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2
Q

What is dynamic stability

A

How an aircraft responds over time to a disturbance

The behaviour of the aircraft during the response from the static stability correction

Link here

Aircraft may oscilate up and down until it settles down

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3
Q

What are the 3 types of Dynamic Stability

A
  1. Positive
  2. Neutral
  3. Negative

Link here

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4
Q

Define positive static stability

A

Object returns to its original start position following a disturbance

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5
Q

Define neutral static stability

A

Object continues to move from its original position without accelerating or decelerating

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6
Q

Define negative static stability

A

Object continues to diverge (accelerate) from its original start position

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7
Q

Draw and define positive dynamic stability

A

Aircraft is disturned
Ocilations up and down
Oscilations reduce in size until aircraft returns to normal
Aircraft eventually flying straight and level

See diagram here

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8
Q

Draw and define neutral dynamic stability

A

Aircraft is disturbed
Ocilations up and down
Ocilations neither increase or decrease
Aircraft continues to oscilate continuously at a steady rate

See diagram here

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9
Q

Draw and define dynamic instability

A

Aircraft is disturbed
Oscillations up and down
Oscillations grow in size
Aircraft continues to oscillate, growing increasingly unstable

See diagram here

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10
Q

Pitching is achieved around ____ axis?

A

Lateral

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11
Q

Rolling is achieved around ____ axis?

A

Longitudinal

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12
Q

Yawing is achieved around ____ axis?

A

Normal (vertical)

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13
Q

The fin/rudder movement creates ____ and controls the aircraft around ____ axis?

A

Yaw
Normal (vertical)

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14
Q

The elevator creates ____ and controls the aircraft around ____ axis?

A

Pitch
Lateral

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15
Q

The aileron creates ____ and controls the aircraft around the ____ axis?

A

Roll
Longitudinal

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16
Q

In general, CoG is FORWARD or AFT of the CoL?
What effect does this have on the nose pitch tendancy?

A

Forward
Pitch nose down

17
Q

Assuming no elevator input

What is the effect of of power on pitch where power is INCREASED

A

General nose up pitch attitude
Faster airflow occurs over tailplane
Tailplane has more downforce, forcing tail down and nose up

18
Q

Assuming no elevbator input

What is the effect of power on pitch where power is DECREASED

A

General nose down pitch attitude
Slower airflow occurs over tailplane
Tailplane has less downforce, tail raises up, pitching nose down

19
Q

Assuming no elevator input

What is the effect of airspeed on pitch if airspeed is changed

A

Lift force produced will change

20
Q

How should a pilot trim to compensate for higher airspeed effects on pitch

A

TRIM ELEVATOR DOWN
Higher airspeed result in more “lift”
Tailplane “lift” is a downforce
Trimming DOWN reduces the AoA, reducing the lift effect

21
Q

How should a pilot trim to compensate for lower airspped effects on pitch

A

TRIM ELEVATOR UP
Lower airspeed results in less “lift”
Tailplane “lift” is a downforce
Trimming UP increases the AoA, increasing the lift effect

22
Q

If CoG is below the thrust line, which way will the nose pitch when power is applied

A

DOWN

23
Q

If CoG is above the thrust line, which way will the nose pitch when power is applied

A

UP

24
Q

What angles are Dihedral and Anhedral wing designs

A

Dihedral
Angled upwards
Positive degree slope from wing base
Anhedral
Angled downwards
Negative degree slope from wing base

25
Q

How does Dihedral wing design help with stability when aircraft is banked

A

Lift is perpendicular to wing
Upgoing wing has reduced vertical lift component to downgoing wing
Downgoing wing has more vertical lift vector to support weight of aircraft

Inreases lateral stability

Review here

26
Q

What are the components of the lateral and directional stability couple

A

Yaw disturbance generates roll moment
Roll disturbance generates yaw moment

27
Q

What is washout and what effect does it have on AoA

A

Gradual reduction of AoA from wing root to wing tip
Ensures AoA is smaller at wing tip
Stall occurs at wing root before wing tip

28
Q

In a stall, how does airflow separation propargate

A

Starts at the trailing edge on upper surface
Propagates forward towards leading edge

29
Q

What are stall strips

A

Attached to leading edge
At high AoA interfer with airflow
Wing behind stall strips stall first

30
Q

What are vortex generators

A

Re-energize boundary layer
prolong separation

PPL - PoF (9 decks)

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