Avidrone Wins DARPA Lift Challenge with 3.84:1 Payload-to-Weight Ratio

DARPA Lift Challenge Concludes

Avidrone Inc. secured first place in the DARPA Lift Challenge with its Katana, a single-main-rotor helicopter. The Katana demonstrated a payload-to-weight ratio of 3.84:1, transporting 51 kg of cast iron with a drone weighing 13.3 kg. This performance was the highest recorded during the competition, which took place at the National Museum of the U.S. Air Force in Dayton, Ohio.

Prize Payouts and Performance Targets

Despite winning, Avidrone Inc. received $1.25 million, half of the advertised $2.5 million, because no team achieved DARPA's 4:1 payload-to-weight ratio target. MTech Operations LLC placed second with a 3.64:1 ratio, earning $750,000, and Xtreme Aerial Concepts took third with 3.45:1, receiving $500,000. The $6.5 million competition, launched last November, saw 61 teams fly out of 124 invited participants.

Conventional Design Dominance

The winning Katana utilized a conventional single-main-rotor helicopter design, a configuration that has been standard since the 1940s. This design outperformed multirotors and other experimental layouts specifically developed for payload-to-weight metrics. The physics behind this outcome suggest that a large rotor disk with low disc loading is more power-efficient for lifting heavy payloads compared to multiple smaller propellers.

Technical Specifications of the Katana

The Katana's propulsion system is battery-electric, incorporating battery modules from Titan Batteries and motors with speed controllers from Scorpion Power System. It also features carbon fiber rotor blades from Falcon Propeller and GNSS antennas from Calian, all integrated into a platform developed in-house by the Avidrone team. The winning run was completed in 19 minutes and 17 seconds, well within the 30-minute limit.