This is a job I did for Privateer Press' Warmachine.
Totally love this job tongue emoticon and crossing my fingers and hope for more XD
From their website
The Minuteman is a product of numerous advances in mechanikal warfare. Utilizing an exactingly designed series of compression chambers, the warjack can launch itself short distances by venting its heartfire through a special propulsion system. It is well suited to annihilating entire swathes of infantry with its short-range grenade launchers upon landing, clearing its line of sight to an intended target. The Minuteman can then unload its dual slug guns into harder targets.
http://privateerpress.com/warmachine/gallery/cygnar/warjacks/minuteman