Fly's rapid wing flutters could inspire mini-drones
Flies have tiny muscles that allow them to make adjustments in mid-flight, and until recently, scientists were unable to get a good look at just how the muscles work.
Wed, Mar 26, 2014 at 10:57 AM
A new video captures the lightning-fast fluttering of blowfly wings in intricate detail.
The 3-D, real-time video of insect flight could be used to design tiny, flying robots, or to create mini sensors for many applications, said study co-author Graham K. Taylor, a biomechanist at the University of Oxford in England.
Tiny, flying machines
Flies are anomalies in the world of insect flight: While most insects, such as dragonflies, have two sets of wings, through evolution blowflies have lost one pair of wings and converted them into a tiny gyroscope that measures the blowflies' rotation.
"That's part of why they're so good at maneuvering — they've got this additional sense that other insects don't have," Taylor told LiveScience.
Understanding how blowflies maneuver is incredibly tricky. Like other flying bugs, they accomplish the large-scale beating of their wings by deforming their thorax (midsection), which then moves the wings up and down.
But the miniscule muscles that steer and make fine-grade adjustments contract at a rapid-fire pace that had made visualization nearly impossible.
Some of the blowflies' steering muscles are as thin as a human hair, Taylor said. "And you're looking at them moving up and down 50 times in the time it takes you to blink your eye," he told LiveScience.
In a blink
To capture such quick movement, researchers glued live blowflies to the equivalent of a Popsicle stick, and then bombarded them with extremely powerful X-rays from a particle accelerator. The X-rays allowed the researchers to capture the speedy, tiny motion of the steering muscles.
The team found that the tiny steering muscles at the hinge of the wings deformed a small amount, about 3 percent. But that small deformation was crucial, because it allowed the muscles to asymmetrically absorb energy from the larger wing beats, thus acting as brakes to slow and steer the flies.
"It's like using the engine to brake when you're going down the hill," Taylor said.
The new findings could be used as inspiration to design tiny flying drones with more precise steering. Instead of relying on rigid materials and traditional engineering structures such as gears, such flying machines could use flexible materials, similar to an insect's exoskeleton, said study co-author Simon Walker, a biomechanist who is also at the University of Oxford.
The same principles could be used for other sensors that require precise, rapid 3-D movements on a small scale, Walker told LiveScience.
The blowfly motion analysis was published on March 25 in the journal PLOS Biology.
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