Kirigami-Inspired Parachutes Achieve Unprecedented Precision in Descent

For centuries, parachutes have solved one problem while creating another. They transform a lethal plunge into a survivable descent, which is why they've saved lives in war zones, rescue operations, and humanitarian missions. But once deployed, they surrender to the wind. A package of medicine aimed at a village clinic can drift half a kilometer off course, landing in terrain where no one can retrieve it. Researchers at Polytechnique Montréal and École Polytechnique in France decided the solution wasn't to engineer a better parachute—it was to cut one.

The inspiration came from kirigami, the Japanese art of precise paper cutting, documented since the 7th century. While children use it to fold snowflakes, engineers in recent years have discovered it can create flexible medical devices, extensible structures, and deployable systems for space. The researchers wondered whether strategic cuts in a parachute canopy could solve the drift problem. The idea sounds counterintuitive—slicing holes into something designed to catch air seems like sabotage. But they began with a simple disc of Mylar and experimented with cut patterns.

The core challenge was stopping the chaos of a falling disc. Drop a frisbee or a sheet of paper and you'll see what they were up against: tumbling, fluttering, unpredictable drift. To map the problem, the team laser-cut three different disc designs from thin Mylar and dropped each from 1.8 meters with a 4.5-gram weight attached to the center. A plain disc tumbled wildly. A densely cut version with concentric slits did the same. But a third design, with a simpler kirigami pattern, transformed into an upside-down bell shape when weighted and dropped straight down without tumbling. "One advantage of this parachute is that it quickly stabilizes and doesn't pitch, regardless of the release angle," said Mélançon, a co-author of the research. Unlike conventional parachutes, it followed a strict ballistic descent trajectory.

The team then subjected the kirigami design to increasingly realistic tests: wind tunnel trials, lab drops, and outdoor releases from a drone. In every scenario, the kirigami parachute performed comparably to a standard parachute, and the behavior remained consistent regardless of size. "The parachute's behavior doesn't change even when the size of the device is augmented," said Frédérick Gosselin, another study author. "This suggests that it could be scaled up for larger applications." The real test was precision. They dropped three versions—an unstable baseline design, the stable kirigami design, and a small conventional parachute—from 16.6 meters onto a target, releasing each from different angles: flat, tilted at 45 degrees, and completely on its side. The kirigami parachutes landed in a tight cluster, nearly all within a meter of the bullseye, regardless of release angle. The pattern didn't just prevent tumbling; it achieved landing accuracy that conventional parachutes couldn't match.

To prove the concept could handle real cargo, the researchers scaled up to a half-meter diameter parachute, attached a water bottle, and mounted it to a drone. At 60 meters altitude, they released it. The kirigami parachute stabilized the bottle through descent, though the descent speed remained faster than a traditional parachute would achieve. The most immediate application the researchers envision is humanitarian aid—delivering water, food, and medicine to remote or conflict-affected areas. The economics are compelling. Traditional parachutes require complex sewing and assembly. These can be mass-produced by laser-cutting or die-cutting patterns onto rolls of plastic sheeting. "We made these parachutes by laser cutting, but a simple die-cutting press would also do the trick," Mélançon explained. "What's more, the parachute is seamless and is attached to the payload by a single suspension line, making it easy to use and to deploy."

The researchers see this as a starting point. Future versions could add soft, stretchable membranes over the kirigami slits to increase drag and slow descent further. More complex, asymmetric patterns might allow programmable trajectories—parachutes that spiral, glide, or follow specific paths to their targets. The payload could even be sorted mid-descent by varying each parachute's trajectory. "We want to change the patterns in order to go even further," Mélançon said. "The parachutes could descend in a spiral, for example, or glide before dropping. We would also like to be able to vary the trajectory of descent depending on the payload, so the cargo could be sorted as the parachutes come down to Earth. This is a whole new design endeavor that opens up a multitude of possibilities." The study was published in Nature. After nearly four centuries of incremental refinement, the parachute may be entering a new era.