Chapter 3.0 (1-20)

chapter-3-3-1-3-20

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Question 1 of 1

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The four forces acting on an airplane in flight are

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Explanation

In normal (non-acrobatic) flight conditions, lift is the upward force created by airflow over and under the wings. Weight, caused by the downward pull of gravity, opposes lift. Thrust Is the forward force which propels the airplane, and drag is the retard

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When are the four forces that act on an airplane in equilibrium?

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Explanation

In straight-and-level, unaccelerated flight, the four forces are in equilibrium. Lift equals weight, and thrust equals drag.

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(Refer to figure 1) The acute angle A is the angle of

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Explanation

The angle between the chord line and the relative wind is the angle of attack.

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The term “angle attack” is defined as the angle between the

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Explanation

The angle of attack is the angle between the chord line of the wing and the relative wind.

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What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?

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Explanation

Assuming the airplane is not accelerating, thrust equals drag, and lift equals weight.

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One of the main functions of flaps during approach and landing is to

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Explanation

Because flaps increase lift, induced drag is also increased, thus allowing a steeper angle of descent without increasing airspeed.

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What is one purpose of wing flaps?

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Explanation

Flaps increase both lift and induced drag, allowing a steeper descent without increasing airspeed.

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The angle of attack at which an airplane wing stalls will

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Explanation

The critical angle of attack (angle of attack at which an airplane stalls) is determined by the lift coefficient of a particular wing configuration. An airplane will stall when the critical angle of attack is exceeded, regardless of weight or airspeed.

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What is ground effect?

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Explanation

When flying close to the ground, the airflow around an airplane is altered by interference with the surface of the earth. The resulting ground effect reduces the induced drag on the airplane.

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Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at

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Explanation

Ground effect becomes noticeable when the height of the airplane above the ground is less than the length of the wingspan.

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What must a pilot be aware of as a result of ground effect?

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Explanation

Since ground effect decreases induced drag, the airplane tends to float while excess speed bleeds off.

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Ground effect is most likely to result in which problem?

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Explanation

The decreased induced drag while in ground effect allows the airplane to become airborne at a lower air speed. This may fool you into thinking the airplane is capable of flying at the lower airspeed when you climb out of ground effect.

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Which statement relates to Bernoulli’s principle?

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Explanation

Bernoulli’s principle, from Swiss mathematician, Daniel Bernoulli’s, simply states that as the velocity of a fluid (including air), increases, its internal pressure decreases.

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The angle between the chord line of an airfoil and the relative wind is known as the angle of

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Explanation

In addition to knowing the relationship of relative wind and angle of attack, remember that angle of attack is not an angle that is relative to the horizon or the aircraft’s pitch in relationship to the ground. For example, the critical angle of attack, a

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Changes in the center of pressure of a wing affect the aircraft’s

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Explanation

A wing’s center of pressure moves forward and back with changing angles of attack (forward for high angles and back for lower). This movement changes the position of the air loads on the wing, which results in changes to an airplane’s aerodynamic balance

Chapter 3.0 (1-20)

Question 1 of 1

Time Left

The four forces acting on an airplane in flight are

Select the correct answer(s).

(0/0)

Explanation

When are the four forces that act on an airplane in equilibrium?

Select the correct answer(s).

(0/0)

Explanation

(Refer to figure 1) The acute angle A is the angle of

Select the correct answer(s).

(0/0)

Explanation

The term “angle attack” is defined as the angle between the

Select the correct answer(s).

(0/0)

Explanation

What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?

Select the correct answer(s).

(0/0)

Explanation

One of the main functions of flaps during approach and landing is to

Select the correct answer(s).

(0/0)

Explanation

What is one purpose of wing flaps?

Select the correct answer(s).

(0/0)

Explanation

The angle of attack at which an airplane wing stalls will

Select the correct answer(s).

(0/0)

Explanation

What is ground effect?

Select the correct answer(s).

(0/0)

Explanation

Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at

Select the correct answer(s).

(0/0)

Explanation

What must a pilot be aware of as a result of ground effect?

Select the correct answer(s).

(0/0)

Explanation

Ground effect is most likely to result in which problem?

Select the correct answer(s).

(0/0)

Explanation

Which statement relates to Bernoulli’s principle?

Select the correct answer(s).

(0/0)

Explanation

The angle between the chord line of an airfoil and the relative wind is known as the angle of

Select the correct answer(s).

(0/0)

Explanation

Changes in the center of pressure of a wing affect the aircraft’s

Select the correct answer(s).

(0/0)

Explanation

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