Finite Wing Theory

Define stability of an aircraft. Explain positive dynamic stability with necessary sketches.

What are the purposes of flaps in an aircraft? Name with neat sketches different types of flaps used in airplane.

In a tornado as shown in Fig. 8(c), the circulation is $8500 \text{ m}^2\text{/s}$ and that the pressure at $r=40 \text{ m}$ is $2200 \text{ Pa}$ which is less than the far-field pressure. Assuming sea-level density of air, calculate the sink strength, the pressure at $r=15 \text{ m}$, and the angle $\beta$ at which the streamlines cross the circle at $r=40 \text{ m}$.