Rocket <a href="https://en.wikipedia.org/wiki/propulsive_efficiency" class="extiw" title="en:propulsive efficiency">propulsive efficiency</a> as a function of vehicle speed divided by effective exhaust speed.
<a href="//commons.wikimedia.org/w/index.php?title=User:Jostikas&amp;action=edit&amp;redlink=1" class="new" title="User:Jostikas (page does not exist)">Jostikas</a>
<span class="int-own-work" lang="en">Own work</span>