<slide>
<title>Thrust to Weight Ratio (TWR)</title>

<image filename="point-rocket-to-space.png" align="right"/>

<blurb>Max weight to satisfy TWR > 1:</blurb>
<blurb>~thrust~ / ~surface_gravity~ =</blurb>
<example result="1"><![CDATA[<?php
function max_weight($thrust, $surface_gravity)
{
	return $thrust / $surface_gravity;
}

echo max_weight( 30000, 9.81 ), "\n";
?>]]></example>

</slide>
