Aircraft Performance: Trim Conditions

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What are the main flight conditions of concern for static trim?

Takeoff and landing with flaps and landing gear down, and high transonic speeds (correct)

Cruise and climb

Descent and stall

Cruise and dive

Which center of gravity (c.g.) position is critical for trim?

Forward c.g. position (correct)

Rearward c.g. position

Mid-c.g. position

Aft-c.g. position

What is the primary concern for an aft-c.g. position?

Control

Performance

Trim

Stability (correct)

During which phase of flight is the forward c.g. position most critical?

Takeoff and landing Signup and view all the answers

What is the relationship between the center of gravity and stability?

Aft-c.g. position is critical for stability Signup and view all the answers

What occurs when there is a change in angle of attack?

Moments that oppose the change occur Signup and view all the answers

Why does the tail angle of attack not vary directly with aircraft angle of attack?

Due to downwash effects Signup and view all the answers

What represents neutral stability in an aircraft?

The neutral point Xnp Signup and view all the answers

What happens to the pitching-moment derivative when the center of gravity is at the neutral point Xnp?

It becomes zero Signup and view all the answers

What is the result of a negative pitching-moment derivative?

The aircraft remains stable Signup and view all the answers

Why is the aft-c.g. position critical for stability?

Because it affects the derivative of pitching moment with respect to angle of attack Signup and view all the answers

Aircraft Performance: Trim Conditions

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Questions and Answers

What are the main flight conditions of concern for static trim?

Which center of gravity (c.g.) position is critical for trim?

What is the primary concern for an aft-c.g. position?

During which phase of flight is the forward c.g. position most critical?

What is the relationship between the center of gravity and stability?

What occurs when there is a change in angle of attack?

Why does the tail angle of attack not vary directly with aircraft angle of attack?

What represents neutral stability in an aircraft?

What happens to the pitching-moment derivative when the center of gravity is at the neutral point Xnp?

What is the result of a negative pitching-moment derivative?

Why is the aft-c.g. position critical for stability?

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