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Static Pitch Stability and Neutral Point

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Static Pitch Stability and Neutral Point

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Questions and Answers

What is the term for the percent distance from the neutral point to the center of gravity?

Pitching moment coefficient

Longitudinal stability margin

Static pitch stability

Static margin (correct)

What is the typical range of positive static margin for a transport aircraft?

1-5%

15-20%

10-15%

5-10% (correct)

What is the purpose of the computerized flight control system in an aircraft with relaxed static stability?

To deflect the elevator and provide artificial stability (correct)

To reduce trim drag

To provide artificial instability

To increase the pitching moment coefficient

What is the effect on the pitching moment derivative when the center of gravity is ahead of the neutral point?

It becomes negative Signup and view all the answers

What is the typical shape of the tailplane on a conventional aircraft?

Symmetrical aerofoil Signup and view all the answers

What is the effect of a negative static margin on an aircraft?

It becomes less stable Signup and view all the answers

What happens to the pitching moment when the downwash decreases the effective angle of attack?

It decreases Signup and view all the answers

What is the purpose of upward deflection of the elevators and downward deflection of the trim tab?

To increase the tailplane download Signup and view all the answers

What is the effect of high angles of attack on the CP?

It moves forward Signup and view all the answers

What is the main difference between the longitudinal and lateral-directional analyses?

The lateral-directional analysis resembles the longitudinal analysis Signup and view all the answers

What is the sign convention for the yawing moment derivative with respect to Beta?

A positive value indicates stability Signup and view all the answers

What is the primary function of the vertical tail in relation to the fuselage?

It counteracts the fuselage yawing moment Signup and view all the answers