# Assignment #2

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16 Νοε 2013 (πριν από 4 χρόνια και 7 μήνες)

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Flight Mechanics
-
II

Assignment Questions
-
1

1.

Develop the equation of motion for an airplane that has freedom only along the

Flight

path; that is, variation in forward speed. If the airplane is perturbed from its

Equilibrium state what type of motion would
you expect? Clearly state all of your

Assumptions.

2.

Define floating tendency and restoring tendency in the case of stick
-
free longitudinal

Stability and derive an expression for control surface angle.

3.

What are the two necessary criteria for l
ongitudinal balance and static stability?

Explain with neat sketches.

4.

Derive an expression for the
fl
oating angle of the elevator of an airplane at a given

tail angle of attack
_
t
and air speed V, in terms of the aerodynamic, geometric and

Inertial proper
ties of the elevator.

5.

Show with two examples, that the lateral and directional dynamics of airplane are

Strongly coupled. Explain from the characteristic equation of lateral
-

directional

Dynamics, the types of oscillations of the airplane.

6.

How are the
terms static stability and dynamic stability associated with an air
-

Plane? Explain with at least one example for static stability and two examples

For dynamic stability. Use sketches.

7.

Explain

EOM(Equation of Motion)

8.

Write a short note on Aircraft Axis
Systems

9.

i)

Dutch Roll and Spiral Divergence

ii)

Stability Augmenter.

10.

Determine the Need for stability in an Airplane?

11.

Write a short note on the following :

i)

Flying Techniques and

ii)

Wind Shear Recovery Techniques.

12.

Write a short
note on Dutch Roll? And differentiate between Directional Divergence and
spiral Divergence.

13.

14.

Write a short note on Drag Reduction

15.

Explain the following terms:

i)

Spiral Flight with a neat sketch

ii)

Brief on Dutch Roll.

16.

Bring out the relationship between yaw and roll of an airplane in the following

cases:

i.

Rolling moment with yaw rate

ii.

Yawing moment with roll rate.

17.

Explain with appropriate sketches, the following:

i)

Phugoid motion

ii)

Spiral instability

iii)

Dutch Roll motion.

18.

What
are the two distinct types of longitudinal modes, required to describe the

Motion of an aircraft, when the aircraft is not perturbed about the roll or yaw axis?
Explain them in detail.