Difference between revisions of "Template:VT"

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m (Minor fix.)
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{{#expr: <!--
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<includeonly>{{#expr: <!--
 
-->    ( <!--
 
-->    ( <!--
-->        2 * {{G}} * {{{M}}} / <!--
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-->        2 * {{G}} * {{Body data/Mass|{{{planet|{{{1}}}}}}}} <!--
-->        ( <!--
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-->        / ( <!--
-->            {{{r}}}^2 * {{{pressure}}} * 0.01225 * 0.2 * 1 <!--
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-->            ({{{alt|{{{2}}}}}} + {{Body data|{{{planet|{{{1}}}}}}|radius}} <!--
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-->            )^2 * <!--
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-->            ( {{Body data|{{{planet|{{{1}}}}}}|pressure}} * e^(-{{{alt|{{{2}}}}}}/{{Body data|{{{planet|{{{1}}}}}}|scale height}}) <!--
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-->            ) * (1.2230948554874 * 0.008) * 0.2 * 1 <!--
 
-->        ) <!--
 
-->        ) <!--
-->    ) ^ 0.5}}<noinclude>
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-->    ) ^ 0.5 {{#if: {{{3|{{{round|}}}}}}|round {{{3|{{{round}}}}}}}}}}</includeonly><noinclude>
  
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{{Outdated|
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* This is almost certainly outdated due to the atmospheric physics changes in [[1.0]].
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}}
 
{| class="wikitable"
 
{| class="wikitable"
 
! Usage || Produces
 
! Usage || Produces
 
|-
 
|-
| <pre><nowiki>{{VT | M=5.2915793E+22 | r=600000 | pressure=1}}</nowiki></pre> || {{VT | M=5.2915793E+22 | r=600000 | pressure=1}}
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| <pre><nowiki>{{VT | planet = Kerbin | alt = 0}}</nowiki></pre> || {{VT | planet = Kerbin | alt = 0}}
 
|}
 
|}
  
This template calculates terminal velocity given a planet's mass (''M''), the distance of a body from the planet's center (''r''), and the atmospheric pressure (''pressure''), specified in units of 1 atm (the pressure at sea level on Kerbin). It assumes that the coefficient of drag is 0.2 and that the cross-sectional area is 1 m<sup>2</sup>.
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This template calculates terminal velocity of an object given the planet and the altitude from the planet's surface. It uses {{Tl|Body data}} with the properties <tt>mass</tt>, <tt>radius</tt>, <tt>pressure</tt> and <tt>scale height</tt>.
  
[[Category:Templates|VT]]
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{{Parameter table|name=both|parameters=
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{{Parameter row|1|name2=planet|The celestial body}}
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{{Parameter row|2|name2=alt|The altitude at which the terminal velocity should be calculated.}}
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{{Parameter row|3|name2=round|Round to the given number of decimal places.|Not set/Doesn't round}}
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}}
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: <math>v_T = \sqrt{\frac{250 \frac{\text{kg}}{\text{m}^2} \cdot GM}{(a+r)^2 \cdot \rho \cdot d}}</math>
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: <math>\rho = 1.2230948554874 \frac{\text{kg}}{\text{m}^3 \cdot \text{atm}} \cdot p_0 \cdot e^\frac{-a}{H}</math>
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<small>(<tt>M</tt> is the mass of the body, <tt>r</tt> is the body's radius, <tt>p<sub>0</sub></tt> is pressure at 0 m altitude (“sea level”), <tt>a</tt> is the altitude above sea level and <tt>H</tt> is the scale height)</small>
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The formula assumes that the coefficient of drag (d) is 0.2 and is used from the [[atmosphere]] article.
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[[Category:Templates]]
 
</noinclude>
 
</noinclude>

Latest revision as of 11:41, 12 May 2018



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

(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.