# Template:VT

Usage Produces
{{VT | planet = Kerbin | alt = 0}}
100.1288989294

This template calculates terminal velocity of an object given the planet and the altitude from the planet's surface. It uses {{Body data}} with the properties mass, radius, pressure and scale height.

#/Name Optional Description Default
1 or planet No The celestial body
2 or alt No The altitude at which the terminal velocity should be calculated.
3 or round Yes Round to the given number of decimal places. Not set/Doesn't round
${\displaystyle v_{T}={\sqrt {\frac {250{\frac {\text{kg}}{{\text{m}}^{2}}}\cdot GM}{(a+r)^{2}\cdot \rho \cdot d}}}}$
${\displaystyle \rho =1.2230948554874{\frac {\text{kg}}{{\text{m}}^{3}\cdot {\text{atm}}}}\cdot p_{0}\cdot e^{\frac {-a}{H}}}$

(M is the mass of the body, r is the body's radius, p0 is pressure at 0 m altitude (“sea level”), a is the altitude above sea level and H is the scale height)

The formula assumes that the coefficient of drag (d) is 0.2 and is used from the atmosphere article.