The right (#2) Rolls-Royce AE 2100 turboprop engine of a C-27J Spartan military transport aircraft
<a href="//commons.wikimedia.org/wiki/User:Ariadacapo" title="User:Ariadacapo">Olivier Cleynen</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>