Engineers have developed a drone with a feathered wing and tail that give it unprecedented flight agility.
The next-generation drone, developed by researchers at the Laboratory of Intelligent Systems of EPFL led by Dario Floreano, was inspired by northern goshawk, a fast, powerful raptor that flies effortlessly through forests.
The team carefully studied the shape of the bird's wings and tail and its flight behaviour and used that information to develop a drone with similar characteristics.
"Goshawks move their wings and tails in tandem to carry out the desired motion, whether it is rapid changes of direction when hunting in forests, fast flight when chasing prey in the open terrain, or when efficiently gliding to save energy," said Enrico Ajanic, the first author and PhD student in Floreano's lab.
"Our design extracts principles of avian agile flight to create a drone that can approximate the flight performance of raptors, but also tests the biological hypothesis that a morphing tail plays an important role in achieving faster turns, decelerations, and even slow flight," added Floreano
The team's research has been published in Science Robotics.
The engineers already designed a bird-inspired drone with morphing wing-back in 2016. In a step forward, their new model can adjust the shape of its wing and tail thanks to its artificial feathers.
"It was fairly complicated to design and build these mechanisms, but we were able to improve the wing so that it behaves more like that of a goshawk," said Ajanic. "Now that the drone includes a feathered tail that morphs in synergy with the wing, it delivers unparalleled agility."
The drone changes the shape of its wing and tail to change direction faster, fly slower without falling to the ground, and reduce air resistance when flying fast. It uses a propeller for a forward thrust instead of flapping wings because it is more efficient and makes the new wing and tail system applicable to other winged drones and aeroplanes.
The advantage of winged drones over quadrotor designs is that they have a longer flight time for the same weight. However, quadrotors tend to have greater dexterity, as they can hover in place and make sharp turns.
"The drone we just developed is somewhere in the middle. It can fly for a long time yet is almost as agile as quadrotors," said Floreano. This combination of features is especially useful for flying in forests or cities between buildings.
AI-based flight system
Flying this new type of drone isn't easy, due to a large number of wing and tail configurations possible. To take full advantage of the drone's flight capabilities, Floreano's team plans to incorporate artificial intelligence into the drone's flight system so that it can fly semi-automatically.