Chapter 7

Question 1

When an airplane is in accelerated flight (level turn or pull-up), the effect is a rotation ________.

Answer 1

About the y-axis.

Perkins and Hage, Pg. 299

Question 2

True or False

Rotation about the y-axis creates a pitch damping force, thereby requiring more elevator from the pilot.

Answer 2

True

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Question 3

True or False

The airplane usually has slightly more stability in accelerated flight.

Answer 3

True (this is due to pitch damping)

Perkins and Hage, Pg. 300

Question 4

Define the “maneuver points.”

Answer 4

The c.g. positions such that the change in elevator deflection or the stick force required to accelerate the airplane will be zero.

Perkins and Hage, Pg. 300

Question 5

Define the “stick-fixed maneuver point.”

Answer 5

The c.g. where the elevator angle required to accelerate the airplane goes to zero.

Perkins and Hage, Pg. 300

Question 6

Define the “stick-free maneuver point.”

Answer 6

The c.g. where the stick force required to accelerate the airplane goes to zero.

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Question 7

The pitch rate q for an airplane in a pull up is directly proportional to ______& _________ and inversely proportional to ______.

Answer 7

Gravitational acceleration (g) and load factor (n)
Velocity (V)

Perkins and Hage, Pg. 301

Question 8

True or False

It is required that the most rearward c.g. be forward of the stick fixed maneuver point.

Answer 8

True

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Question 9

The stick force per g gradient varies with ____.

Answer 9

The c.g. location.

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Question 10

The stick force gradient is heavier if the c.g. is ______.

Answer 10

moving forward (and VV)

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Question 11

What is the stick-free maneuver point from the perspective of the pilot?

Answer 11

The point when there is no feedback in the controls at all.

Perkins and Hage, Pg. 306

Question 12

True or False

Flying an airplane back of the stick-free maneuver point is safe.

Answer 12

False.
It is extremely hazardous as even the slightest control input would cause the aircraft to rapidly diverge, leading to structural failure and possible in-flight break-up.

Perkins and Hage, Pg. 307

Question 13

What problems arise when the stick force per unit g is too high?

Answer 13

The controls are very hard to move, leading to pilot fatigue.

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Question 14

What problems arise when the stick force gradient is too low?

Answer 14

The controls are too sensitive leading to pilot over-control problems and eventual exhaustion.

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Question 15

The stick-free maneuver point occurs when what derivative is zero?

Answer 15

dFs/dn = 0.

Perkins and Hage, Pg. 308

Question 16

The actual c.g. range lies between _____.

Answer 16

The stick-free neutral point with power on and the max allowable limit on dFs/dn

Perkins and Hage, Pg. 312