"The Kaman K-MAX (Company designation K-1200) is an American helicopter with intermeshing rotors (synchropter) built by Kaman Aircraft. It is optimized for external load operations, and is able to lift a payload of over 6,000 pounds (2,722 kg), which is more than the helicopter's empty weight. A remote controlled unmanned aerial vehicle version is being developed and is being evaluated in extended practical service in the war in Afghanistan."








http://defense-update.com/20130318_k-max-to-stay-in-afghanistan-until-the-2014-withdrawal.html
http://en.wikipedia.org/wiki/Kaman_K-MAX