Navigation Links
Scientist uses dragonflies to better understand flight

If mastering flight is your goal, you can't do better than to emulate a dragonfly. With four wings instead of the standard two and an unusual pitching stroke that allows the bug to hover and even shift into reverse, the slender, elegant insect is a marvel of engineering.

Z. Jane Wang, professor of theoretical and applied mechanics at Cornell University, presented her research on flying systems and fluid dynamics today (Feb. 19) at the annual meeting of the American Association for the Advancement of Science. In a seminar "Falling Paper, Dragonfly Flight and Making a Virtual Insect," she said the best way to learn about flight is by first looking at what happens naturally.

Look at how such thin structures as falling paper move through a fluid environment like air, she said, and then examine how insects use their wings to manipulate that environment and stay aloft.

"The major question I focus on is the question of efficiency," Wang said in an interview. "It's the long-standing question: Of birds and planes, which is better? And if we think planes are better -- why?"

Conventional wisdom holds that airplanes (airfoils) are more efficient because they travel from point to point with no wasted up-and-down motion. "But there are infinitely many ways you can go up and down," said Wang. "Of all these paths, are any better than a straight line? Some are -- that's what I found."

The insight came from dragonflies.

"Dragonflies have a very odd stroke. It's an up-and-down stroke instead of a back-and-forth stroke," she said. "Dragonflies are one of the most maneuverable insects, so if they're doing that they're probably doing it for a reason. But what's strange about this is the fact that they're actually pushing down first in the lift.

"An airfoil uses aerodynamic lift to carry its weight. But the dragonfly uses a lot of aerodynamic drag to carry its weight. That is weird, because with airplanes you always think about minimi zing drag. You never think about using drag."

The next question, she said, is whether engineers can use these ideas to build a flapping machine as efficient as a fixed-wing aircraft.

Questions of size and feasibility remain. "To hover well or to fly for a long time is hard, especially at slow speeds," she said. "Power is limited. So finding these efficient motions is very important."

Still, Wang's work moves researchers a step closer to building such a machine.

"I want to build insects on a computer as a way of learning why almost all things that move in fluid use a flapping motion," said Wang. "Whether it's a fish which flips its fins or a bird, they're actually using the same principle.

"The way paper or leaves fall, and how insects fly, may give us some ideas about why animals use these methods at all," she said.


'"/>

Source:Cornell University News Service


Related biology news :

1. Scientists ID molecular switch in liver that triggers harmful effects of saturated and trans fats
2. Scientists Replicate Hepatitis C Virus in Laboratory
3. Scientists detect probable genetic cause of some Parkinsons disease cases
4. Scientists find missing enzyme for tuberculosis iron scavenging pathway
5. Scientists seek answers on what activates deadly anthrax spores
6. Yale Scientists Find MicroRNA Regulates Ras Cancer Gene
7. Scientists collaborate to assess health of global environment
8. Scientists decipher genome of fungus that can cause life-threatening infections
9. Scientists discover the cellular roots of graying hair
10. Scientists rid stem cell culture of key animal cells
11. Scientists develop new color-coded test for protein folding
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:11/15/2016)... 15, 2016  Synthetic Biologics, Inc. (NYSE MKT: ... on the gut microbiome, today announced the pricing ... of its common stock and warrants to purchase ... price to the public of $1.00 per share ... from the offering, excluding the proceeds, if any ...
(Date:11/14/2016)... , Nov. 14, 2016  Based on ... market, Frost & Sullivan recognizes FST Biometrics ... Award for Visionary Innovation Leadership. FST Biometrics ... biometric identification market by pioneering In Motion ... for instant, seamless, and non-invasive verification. This ...
(Date:6/22/2016)... June 22, 2016   Acuant , ... verification solutions, has partnered with RightCrowd ® ... for Visitor Management, Self-Service Kiosks and Continuous ... that add functional enhancements to existing physical ... and venues with an automated ID verification ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... -- Eurofins announces the appointment of Sean Murray , National ... (ESI). Mr. Murray will bring valuable expertise to ... in leading international business teams. As the National Division Leader, he ... Eurofins, status as the global leader in bio-analytical testing services. ... , , ...
(Date:12/8/2016)... 8, 2016  Anaconda BioMed S.L., a pre-clinical stage ... next generation neuro-thrombectomy system for the treatment of Acute ... Jovin, MD to join its Scientific Advisory Board (SAB). ... network of scientific and clinical experts to Anaconda BioMed ... ANCD BRAIN ® to its clinical phase. The ...
(Date:12/8/2016)...  Soligenix, Inc. (OTCQB: SNGX) (Soligenix or the ... and commercializing products to treat rare diseases where ... the long-term follow-up data from its Phase 2 ... Defense Regulator (IDR), in the treatment of oral ... undergoing chemoradiation therapy (CRT).  The additional 12-month safety ...
(Date:12/8/2016)... , Dec. 8, 2016  Partnering to fuel ... Ben Franklin Technology Partners of Southeastern Pennsylvania ... ("IHG"), the parent company of Independence Blue Cross; and ... announced their intentions for a $6 million funding initiative ... healthcare startups. Responding to a burgeoning economic ...
Breaking Biology Technology: