Science

Study suggests seabirds' black wings allow them to fly longer

Study suggests seabirds' black...
Solar heating of the black wings of birds such as the albatross may improve their lift-to-drag ratio
Solar heating of the black wings of birds such as the albatross may improve their lift-to-drag ratio
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Solar heating of the black wings of birds such as the albatross may improve their lift-to-drag ratio
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Solar heating of the black wings of birds such as the albatross may improve their lift-to-drag ratio

If you were a bird, chances are that you'd want to minimize the number of times you had to land and rest on the potentially treacherous ocean. A new study now suggests that multiple seabird species have thus evolved dark-colored wings, in order to stay aloft longer.

The study was conducted by scientists from Belgium's Ghent University, the Von Karman Institute for Fluid Dynamics, the Katholieke Universiteit Leuven, the Royal Belgian Institute for Natural Sciences, and Illinois-based Northwestern University.

Multiple types of black-winged seabirds were placed in a wind tunnel at the Von Karmen Institute, where their black wing feathers were warmed via radiative heating – this is the same manner in which they would naturally be warmed by the sun. It was found that the warmer those feathers, the better the birds' flight efficiency. More specifically, their ability to glide without a substantial loss of altitude improved by up to 20 percent.

This finding supports previous research, which showed that the heating of an airfoil boosts its lift-to-drag ratio. Putting it simply, the higher that ratio, the more efficient an aircraft – or bird – is at flying.

The scientists went on to determine that over time, the increasing amounts of melanin (dark pigment) in seabirds' wings "followed an evolutionary trajectory" similar to that of other traits associated with improved flight efficiency.

And yes, it's possible that we could eventually be seeing an increasing number of black-winged airplanes. "These findings may also serve as a guide for bioinspired innovations in aerospace and aviation, especially in low-speed regimes," the researchers stated.

A paper on the study was recently published in the Journal of the Royal Society.

Source: Ghent University via AlphaGalileo

5 comments
5 comments
Worzel
I'm wondering if adding an infrared heater to heat fan blades would pay for itself with increased efficiency of the fans (black) blades.
Catweazle
In aviation, instead of dumping waste exhaust heat, use it to warm the upper surfaces of the wing?
Hugol
Wow, really interesting. Could this be attributed to changes in air viscosity that affect friction between air and the feathers? or changes in fathers that affect how air flows around / through them? (mostly rethorical question)
Nelson Hyde Chick
Catweazle That has been tried by the Boeing YC-14: https://en.wikipedia.org/wiki/Boeing_YC-14
rarcher2
So when SR-71 was trundling along at Mach whatever did it's wings have enormous lift and almost zero drag?