Loaded to the K-MAX
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With its 5,145 lb empty weight (2.3 metric tons), the K-MAX UAS cannot quite convey the same sense of graceful lightness as its Hummingbird Boeing competitor, coming at slightly less than half the weight.

Belonging to a different weight class shifts the Lockheed Martin/Kaman helo to a different mission focus, with a clear emphasis on battlefield cargo resupply. K-MAX has a useful load of 6,855 lb (3.1 tons) vs. 2,500 pounds for the Hummingbird. Up to 6,000 lb (at sea level) can be attached to the cargo hook which is attached to a curved trolley system. Payload at 10,000 ft is still rated above 5,000 lb. (more…)

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Another one of those rotor layouts that just shouldn't work! Saw the HH-43 Huskie at the USAF museum that has a similar layout and can't really believe it works either even though obviously it does.