Engineering

Engineers study hovering bats and hummingbirds in Costa Rica

Each sunrise in Las Cruces, Costa Rica, River Ingersoll's field team trekked into the jungle to put the finishing touches on nearly invisible nets. A graduate student in the lab of David Lentink, assistant professor of mechanical ...

Energy & Green Tech

Novel wind turbine flaps like a hummingbird

(Tech Xplore)—A Tunisian company called Tyer Wind has released details of a new type of wind turbine they have developed that is based on what the company describes as 3-D Aouinian kinematics—a wind turbine designed to ...

Hummingbird

Hummingbirds are birds that comprise the family Trochilidae. They are among the smallest of birds, most species measuring in the 7.5–13 cm (3–5 in) range. Indeed, the smallest extant bird species is a hummingbird, the 5-cm Bee Hummingbird. They can hover in mid-air by rapidly flapping their wings 12–90 times per second (depending on the species). They are also the only group of birds able to fly backwards. Their English name derives from the characteristic hum made by their rapid wing beats. They can fly at speeds exceeding 15 m/s (54 km/h, 34 mi/h).

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