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Gnidningsmordstand gennem Luft
$$F_{luft} = \frac{1}{2} \cdot c_w \cdot \rho \cdot A \cdot v^2$$
Renolds-tallet (for en kugle)
$$F_D= 6\pi \eta rv$$
$$Re = \frac{\rho \cdot v \cdot d}{\eta}$$
$\rho$ = densitet
$v$ = hastighed
$d$ = diameteren af kuglen
$\eta$ = Viskositeten
| Re |
Strømningens Art |
| Re < 1 |
Laminar |
| Re > 2000 |
Turbulent |