<a href="https://en.wikipedia.org/wiki/Propulsive_efficiency#Rocket_engines" class="extiw" title="w:Propulsive efficiency">Propulsive efficiency</a> propulsion efficiency graph.
<a href="//commons.wikimedia.org/wiki/User:Krishnavedala" title="User:Krishnavedala">Krishnavedala</a>
<span class="int-own-work" lang="en">Own work</span>