Finite Wing Theory (Week 9 and 10)

Question 1

What are the two theorems of Helmholtz’s?

Answer 1

1. strength of vortex filament is constant along its length
2. A vortex filament cannot end in a fluid; it must extend to boundaries of the fluid or form a closed path.

Question 1

What is the Biot-Savart Law?

Answer 1

Establishes the velocity induced in a point due to any vortex filament.

Question 2

What is the equation for induced drag?

Answer 2

Induced drag = profile drag + induced drag

Question 3

What three things can we use to convert between wings or different aspect ratios to keep a constant lift coefficient?

Answer 3

1. lift slope
2. drag coefficient
3. geometric angle of attack