Hong Kong team develops lightweight drone that can fly for longer – inspired by maple seeds
- The 35-gram (1-oz) bicopter can hover for 15 to 24 minutes and carry a small air-quality sensor or camera for mapping and surveillance, CityU researchers say
- Its propellers generate rotation and it has two large wings – a design based on samara seeds, which rotate to slow down as they fall from the tree
The researchers said their 35-gram (1-oz) bicopter drone can carry a small air-quality sensor or camera for mapping and surveillance tasks and can hover for 15 to 24 minutes depending on the battery size.
They detailed the drone’s design in the peer-reviewed journal Science Robotics on Thursday.
Lead researcher Pakpong Chirarattananon, an associate professor with CityU’s biomedical engineering department, said the aerodynamics of smaller machines – and animals – made it harder for them to fly.
“When a drone gets smaller, forces such as friction or drag become more dominant,” he said. “Even if we can make small robots fly, they still cannot fly for a long time.”
A drone weighing 500 grams (18 grams) can fly for around 20 to 30 minutes, but that flying time can be as short as five minutes for a smaller drone of 50 to 100 grams, according to Chirarattananon, founder of the university’s robotics and intelligent systems laboratory.
To reduce the drone’s power consumption, the team looked to the Japanese maple tree’s samara seeds. The seeds rotate as they fall which slows them down – meaning they spend longer in the air and can be blown further away to improve their chances of reproduction.