Stability Basic and Longitudinal Stability

Question 1

When is Dynamic Stability Positve?

Answer 1

The aerodynamic effect that causes the oscillation to die out is known as aerodynamic damping

Question 2

How would you describe positive dynamic stability in a scientific way?

Answer 2

periodic motion of decreasing amplitude

Question 3

How would you describe neutral dynamic stability in a scientific way?

Answer 3

periodic motion of constant amplitude

Question 4

How would you describe negative dynamic stability in a scientific way?

Answer 4

periodic motion of increasing amplitude, or Divergence

Question 5

How would you refer to a slow oscillation up and down?

Answer 5

Long Period stability

Question 6

What’s the tendency of aircraft to vary their height and speed during a cycle of Long Period Stability called?

Answer 6

Entering a Phugoid

Question 7

What’s the aerodynamic center (AC)?

Answer 7

Point in the aerofoil where the pitching moment does not change with alpha or CL

Question 8

What is the trim point in the CM alpha graph?

Answer 8

Is the point where the blue line crosses the horizontal axix. The aircraft is trimmed to produce no pitching moments, so it will continue on its path if the piulot takes his/her hands off the controls

Question 9

What’s the longitudinal dihedral in a tail plane?

Answer 9

IT is the difference of incidence between the wing and the tail plane.

Question 10

What is aircraft static stability?

Answer 10

The immediate respose to a disturbance