Flight time against mass of small (less than 1 kg) drones.
<a href="//commons.wikimedia.org/wiki/User:Jarekt" title="User:Jarekt">Jarek Tuszynski</a>
2015-05-27
<ul><li><span class="int-own-work" lang="en">Own work</span></li>
<li>Data from <cite style="font-style:normal"> (<span class="mw-formatted-date" title="2015-05-27">27 May 2015</span>). "<a rel="nofollow" class="external text" href="http://www.nature.com/nature/journal/v521/n7553/full/nature14542.html">Science, technology and the future of small autonomous drones</a>". <i>Nature</i> <b>521</b> (7553): 460–466. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038/nature14542">10.1038/nature14542</a>. Retrieved on <span class="mw-formatted-date" title="2016-02-11">11 February 2016</span>.</cite></li></ul>