The flight of the humble bee was once so baffling that mathematicians famously concluded it was impossible. But using high-speed cameras and a scale model robot scientists have at last worked out the secret that helps bees stay aloft.
Most flying insects flap their wings using long, sweeping strokes, but honeybees take a less efficient approach. Even though it is a less stable way to fly, honeybees flap their wings more furiously producing just enough force to lift their bodies.
The scientists believe bees developed the unusual style to cope with the varying demands they face during flight. When foraging for nectar, they are at their lightest, but when laden with pollen, or carrying larvae, they can weigh twice as much. By switching from rapid, short wingbeats to longer beats, bees can vary the creature's lifting power considerably.
The scientists unravelled the bees' flying tactics by diverting them into a clear plastic box fitted with three high-speed video cameras which took 3D snapshots of the hovering insects 6,000 times a second. They found that a honeybee typically flaps its 1cm-long wings 240 times a second, each beat covering an arc of only 90o.
Other insects flap at no more than 200 times a second, with each stroke beating over a 165o arc. Instead of producing a steady, powerful upward thrust, the bees' flying style generates peaks of lift at the beginning, middle and end of each beat.
To test the bees, researchers pumped a mixture of helium and oxygen into the box, making the air thin. The bees responded by opening out their stroke to around 140o, and switching their flight behavior to that used by other insects.
Indonesia was to sign an agreement to repatriate two British nationals, including a grandmother languishing on death row for drug-related crimes, an Indonesian government source said yesterday. “The practical arrangement will be signed today. The transfer will be done immediately after the technical side of the transfer is agreed,” the source said, identifying Lindsay Sandiford and 35-year-old Shahab Shahabadi as the people being transferred. Sandiford, a grandmother, was sentenced to death on the island of Bali in 2013 after she was convicted of trafficking drugs. Customs officers found cocaine worth an estimated US$2.14 million hidden in a false bottom in Sandiford’s suitcase when
CAUSE UNKNOWN: Weather and runway conditions were suitable for flight operations at the time of the accident, and no distress signal was sent, authorities said A cargo aircraft skidded off the runway into the sea at Hong Kong International Airport early yesterday, killing two ground crew in a patrol car, in one of the worst accidents in the airport’s 27-year history. The incident occurred at about 3:50am, when the plane is suspected to have lost control upon landing, veering off the runway and crashing through a fence, the Airport Authority Hong Kong said. The jet hit a security patrol car on the perimeter road outside the runway zone, which then fell into the water, it said in a statement. The four crew members on the plane, which
Japan’s ruling Liberal Democratic Party (LDP) and its junior partner yesterday signed a coalition deal, paving the way for Sanae Takaichi to become the nation’s first female prime minister. The 11th-hour agreement with the Japan Innovation Party (JIP) came just a day before the lower house was due to vote on Takaichi’s appointment as the fifth prime minister in as many years. If she wins, she will take office the same day. “I’m very much looking forward to working with you on efforts to make Japan’s economy stronger, and to reshape Japan as a country that can be responsible for future generations,”
SEVEN-MINUTE HEIST: The masked thieves stole nine pieces of 19th-century jewelry, including a crown, which they dropped and damaged as they made their escape The hunt was on yesterday for the band of thieves who stole eight priceless royal pieces of jewelry from the Louvre Museum in the heart of Paris in broad daylight. Officials said a team of 60 investigators was working on the theory that the raid was planned and executed by an organized crime group. The heist reignited a row over a lack of security in France’s museums, with French Minister of Justice yesterday admitting to security flaws in protecting the Louvre. “What is certain is that we have failed, since people were able to park a furniture hoist in the middle of
RSS