DARPA heavy lift challenge ends with winner at a 3.84:1 payload to weight ratio

Avidrone Inc. won the DARPA Lift Challenge at a 3.84:1 payload-to-weight ratio with the Katana, a conventional single-rotor helicopter, and because nobody reached 4:1, the half-prize clause DroneXL reported last week cut every podium payout in two. The result says as much about energy density and American drone policy as it does about lift.