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323 Ground School > Exam 4 Review > Flashcards

Exam 4 Review Flashcards

1
Q

Movement around the longitudinal axis is called:

A

Roll

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2
Q

Movement around the lateral axis is called:

A

Pitch

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3
Q

Movement around the vertical axis is called:

A

Yaw

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4
Q

What is Dynamic Stability?

A

An objects tendency to return to its previously undistrubed state OVER TIME

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5
Q

What is Static Stability?

A

INITIAL tendency of an object to return to its previously undisturbed state

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6
Q

What is a Phugoid?

A
  • Aircraft motion where attitude, pitch and airspeed vary widely
  • Interchangeable between Kinetic and Potential Energy
  • *Tail Stalls Out**
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7
Q

Explain Dutch Roll

A

Coupled lateral/directional oscillation that is “Out of Phase”

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8
Q

Name 2 types of stability that increase when we sweep the wings back

A
  1. Side Slip

2. Static

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9
Q

What is the Rate equation?

A

Rate (deg per sec) = 1091(tan BA)/V

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10
Q

What is the Radius equation?

A

Radius (feet) = V^2/11.26(tan BA)

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11
Q

What is the Load Factor equation?

A

n (Gs) = 1/(cos BA)

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12
Q

_____ static stability leads to ALL dynamic stability.

A

POSITIVE static leads to ALL dynamics

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13
Q

If an a/c’s controls are bumped and the plane returns back to its OG state, it has what kind of stability?

A

POSITIVE STATIC

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14
Q

If an a/c’s controls are bumped and the plane remains steady in the new position, it has what kind of stability?

A

NEUTRAL STATIC

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15
Q

If an a/c’s controls are bumped and the plane continues away from its OG state, it has what kind of stability?

A

NEGATIVE STATIC

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16
Q

If an a/c’s controls are bumped and the planes displacement reduces over time back to its OG state, it has what kind of stability?

A

POSITIVE DYNAMIC

17
Q

If an a/c’s controls are bumped and the planes displacement remains constant over time, it has what kind of stability?

A

NEUTRAL DYNAMIC

18
Q

If an a/c’s controls are bumped and the planes displacement increases over time away from its OG state, it has what kind of stability?

A

NEGATIVE DYNAMIC

19
Q

What are 2 causes of ROLL due to YAW?

A
  1. Speed difference of wings

2. Rolling moment on the vertical tail

20
Q

What do we call YAW due to ROLL?

A

Adverse Yaw

21
Q

What results when an a/c BANKS w/o a turn?

A
  1. Side Slip

2. Keel effect?

22
Q

When we trim the elevator, what are we trimming to maintain?

A

Airspeed

23
Q

How is LATERAL stability achieved?

A
  1. Dihedral
  2. Keel Effect
  3. Sweepback
24
Q

What gives stability around the VERTICAL axis?

A

Vertical tail (Fin and Rudder)

25
Q

What gives stability around the LONGITUDINAL axis?

A
  1. CG
  2. Horizontal Stabilizer
    (Pitch stability)
    - Stability around the lateral axis
26
Q

What gives movement around the vertical axis?

A

Rudder

27
Q

What gives movement around the longitudinal axis?

A

Ailerons

28
Q

What gives movement around the lateral axis?

A

Elevator

29
Q

List 6 things that give longitudinal stability?

A
  1. CG
  2. Weight
  3. Lift
  4. Tail
  5. Canard
  6. Pitch stability
30
Q

Why do manufacturers add a Dorsal Fin to an airplane?

A
  • Gives SIDE FORCE to have nose chase into the Relative Wind

- Helps to get out of spins

31
Q

You’re in a 43 degree bank angle, IAS is 137 knots and the plane weighs 6,300 lbs. Find load factor, rate of turn and radius of turn!

A

Load Factor = 1.37 Gs
Rate = 7.43 degrees per second
Radius = 1,787.5 ft

32
Q

When would an a/c become “Out of Phase”

A

During a Dutch Roll

33
Q

What does Dihedral help with?

A

Lateral Stability

34
Q

What do Sweepback wing help with?

A

Lateral Stability when banking

35
Q

What IS dihedral? How does it work?

A
  • The upward angle of an a/c’s wings from the fuselage

- Lower wing flying at a higher AOA, increases lateral stability when banking

36
Q

What is Keel Effect?

A

The result of sideforce-generating surfaces being above/below the CG in an a/c

37
Q

4 ways lateral stability is designed into a/c

A
  1. Dihedral
    2 sweepback
  2. Keel
  3. Vertical wing placement

323 Ground School (3 decks)

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