- #1

- 72

- 0

## Main Question or Discussion Point

Why the 1/2 factor in the equation [itex]F_{R} = \frac{1}{2}\rho C_{d}A v^{2}[/itex]? Why not just divide every [itex]C_{d}[/itex] value found in tables by 2 and omit the 1/2 in the equation instead?

- Thread starter damosuz
- Start date

- #1

- 72

- 0

Why the 1/2 factor in the equation [itex]F_{R} = \frac{1}{2}\rho C_{d}A v^{2}[/itex]? Why not just divide every [itex]C_{d}[/itex] value found in tables by 2 and omit the 1/2 in the equation instead?

- #2

ShayanJ

Gold Member

- 2,788

- 586

- #3

- 528

- 33

Now I have an equation ##F=kx##. This is the force exerted by a compressed /elongated spring. If I use the values given in the new table, I will get wrong answer. So I will have to multiply 2 every time I use it. Maybe ##C_d## has other uses and ##C_d## is more commonly used than ##C_d/2##.

- #4

- 3,071

- 741

- #5

- 48

- 1

It's really convenient this way especially when it comes to application in Flight mechanics, Stability and Control.

- Replies
- 1

- Views
- 2K

- Last Post

- Replies
- 8

- Views
- 5K

- Last Post

- Replies
- 1

- Views
- 4K

- Last Post

- Replies
- 27

- Views
- 2K

- Last Post

- Replies
- 1

- Views
- 10K

- Replies
- 2

- Views
- 3K

- Last Post

- Replies
- 2

- Views
- 1K

- Replies
- 9

- Views
- 12K