HOME >> BIOLOGY >> NEWS
Mimicking humpback whale flippers may improve airplane wing design

DURHAM, N.C. -- Wind tunnel tests of scale-model humpback whale flippers have revealed that the scalloped, bumpy flipper is a more efficient wing design than is currently used by the aeronautics industry on airplanes. The tests show that bump-ridged flippers do not stall as quickly and produce more lift and less drag than comparably sized sleek flippers.

The tests were reported by biomechanicist Frank Fish of West Chester University, Penn., fluid dynamics engineer Laurens Howle of the Pratt School of Engineering at Duke University and David Miklosovic and Mark Murray at the U.S. Naval Academy. They reported their findings in the May 2004 issue of Physics of Fluids , published in advance online on March 15, 2004.

In their study, the team first created two approximately 22-inch-tall scale models of humpback pectoral flippers -- one with the characteristic bumps, called tubercles, and one without. The models were machined from thick, clear polycarbonate at Duke University. Testing was conducted in a low speed closed-circuit wind tunnel at the U.S. Naval Academy in Annapolis, Md.

The sleek flipper performance was similar to a typical airplane wing. But the tubercle flipper exhibited nearly 8 percent better lift properties, and withstood stall at a 40 percent steeper wind angle. The team was particularly surprised to discover that the flipper with tubercles produced as much as 32 percent lower drag than the sleek flipper.

"The simultaneous achievement of increased lift and reduced drag results in an increase in aerodynamic efficiency," Howle explains.

This new understanding of humpback whale flipper aerodynamics has implications for airplane wing and underwater vehicle design. Increased lift (the upward force on an airplane wing) at higher wind angles affects how easily airplanes take off, and helps pilots
'"/>

Contact: Deborah Hill
dahill@duke.edu
919-401-0299
Duke University
11-May-2004


Page: 1 2 3

Related biology news :

1. Study: Mimicking viruses may provide new way to defeat them
2. Mimicking the human body with carbon black polymers
3. Mimicking a human disease in mice
4. South Dakota Tech grad student finds rare whale
5. Evolution of whale hearing unfolds in fossil record
6. Ocean scientists assess impact of seismic pulses in effort to protect whales
7. Research into cetacean reproduction leads to birth of killer whales by artificial insemination
8. News tip: Duke marine biologist calls for whale-proof fishing gear
9. Climate linked to reproduction of right whales
10. Collapse of seals, sea lions & sea otters in North Pacific triggered by overfishing of great whales
11. Seeking the cause of a mysterious whale disease

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/27/2016)... , June 27, 2016 Research and ... North America 2016-2020" report to their offering. ... North America to grow at a CAGR of ... been prepared based on an in-depth market analysis with inputs from ... prospects over the coming years. The report also includes a discussion ...
(Date:6/22/2016)... 22, 2016  The American College of Medical Genetics and ... Magazine as one of the fastest-growing trade shows during ... the Bellagio in Las Vegas . ... of growth in each of the following categories: net square ... number of attendees. The 2015 ACMG Annual Meeting was ranked ...
(Date:6/22/2016)... LOS ANGELES , June 22, 2016 ... of identity management and verification solutions, has ... cutting edge software solutions for Visitor Management, ... ® provides products that add functional ... The partnership provides corporations and venues with ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... 2016  Alex,s Lemonade Stand Foundation (ALSF), a leading ... open a state-of-the-art bioinformatics lab, using ,big data, to ... comes as Liz Scott , co-executive director of ... Summit in Washington, D.C. , hosted ... and advocate of pediatric cancer research and awareness. ...
(Date:6/27/2016)... 27, 2016  Global demand for enzymes is ... 2020 to $7.2 billion.  This market includes enzymes ... products, biofuel production, animal feed, and other markets) ... biocatalysts). Food and beverages will remain the largest ... consumption of products containing enzymes in developing regions.  ...
(Date:6/27/2016)... ON , June 27, 2016 /PRNewswire/ - BIOREM Inc. ... has been advised by its major shareholders, Clean Technology ... United States based venture capital ... shares of Biorem (on a fully diluted, as converted ... the disposition of their entire equity holdings in Biorem ...
(Date:6/27/2016)... 27, 2016  Sequenom, Inc. (NASDAQ: SQNM ... lives through the development of innovative products and services, ... the United States denied its petition to ... of Sequenom,s U.S. Patent No. 6,258,540 (",540 Patent") are ... by the Supreme Court,s Mayo Collaborative Services v. Prometheus ...
Breaking Biology Technology:
Cached News: