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

Avidrone Inc. won the DARPA Lift Challenge on Sunday with the Katana, a conventional single-main-rotor helicopter that weighed 13.3 kg (29.3 pounds) and hauled 51 kg (112.4 pounds) of cast iron around the course at the National Museum of the U.S. Air Force in Dayton, Ohio. That is a 3.84:1 payload-to-weight ratio, the best completed run of the week and a number no shipping heavy-lift drone gets anywhere near. It is also short of 4:1, which means the prize rule DroneXL flagged before the first weigh-in did exactly what it said it would: every podium check got cut in half.