We’re all familiar with standard multirotor drones, which rely on spinning propellers to generate lift and thrust. Then there are fixed-wing drones, that require a thrust of power but better glide through the air with their wide wings. eVTOL drones are increasingly popular to blend the two.
But what if there was another type of drone, one particularly well suited to fly in tight, confined spaces (like collapsed buildings, narrow industrial pipelines, or dense forest canopies) where exposed spinning blades could be a hazard? Enter flapping-wing micro aerial vehicles (FW-MAVs).
This style of drone is inspired by birds and insects, and they typically involved tiny, lightweight robots that use rapidly beating wings to hover, dart and maneuver in tight quarters without the danger of exposed rotors.
So why don’t we actually see drones like these widely used? As it turns out, flapping drones have always suffered from a fatal flaw: they are ridiculously vulnerable to wind gusts. Because they are so light and rely on rapid wing oscillations, a sudden breeze can throw them completely off course.
But that could change. According to a new report put out this month, a research team at Chiba University in Japan says it has solved a fundamental flight dynamics problem, developing a control system that cuts flight position errors in wind by over 50%.
How they solved it
Published in the journal Control Engineering Practice, the study — led by Assistant Professor Abner Asignacion Jr. and Dr. Satoshi Suzuki — investigated why flapping drones struggle so intensely when correcting for wind.
Testing a 103-gram, commercially available Flapping Nimble+ robot, the researchers uncovered a peculiar flight behavior known as non-minimum-phase behavior. When the flapping drone was commanded to move quickly in one horizontal direction to correct for a wind gust, it actually moved slightly in the opposite direction first before self-correcting.
Because of this counter-intuitive movement, standard drone flight controllers that try to correct wind disturbances too fast end up causing violent, unstable oscillations. Conversely, controllers tuned too slowly fail to stop the drone from drifting into walls.
To solve the issue, the Chiba University team designed a custom bandwidth-constrained disturbance observer. This smart control algorithm calculates external wind forces in real time while accounting for the drone’s odd initial wobble.
By carefully tuning how fast the observer responds to sudden air movements, the researchers achieved the perfect middle ground:
- Position error reduction: The robot’s X-axis position error was reduced by 53.1%.
- Overall 3D stability: Total 3D position error in flight dropped by approximately 28%.
Does this mean more flapping-wing drones ahead? Not necessarily. Companies like Flyability have tried to solve issues around exposed propellers by creating drones with full spherical collision-safe frames. And many use cases, like drone delivery and even carrying certain cameras requires bigger drones that can handle bigger payloads.
Still, this study suggests that we might see flapping-wing drones ahead. Because they can hover like hummingbirds and bounce off obstacles safely without exposed propeller blades, stabilized FW-MAVs, that means they could soon be deployed into environments where traditional drones fail—including disaster search-and-rescue inside collapsed structures, tight factory pipe inspections and agricultural crop monitoring.
What do you think? Do flapping-wing drones have a future? Tell me in the comments!
The post Defying wind gusts: How researchers cut flapping-wing drone flight errors by 53% appeared first on The Drone Girl.