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:
(Date:12/19/2014)... Research and Markets ( http://www.researchandmarkets.com/research/86ncd6/micro_market ) has announced ... Perimeter Security Systems Market" report to their offering. ... American perimeter security market is estimated to grow at a ... market holds a larger share in this market, ...
(Date:12/17/2014)... and Markets ( http://www.researchandmarkets.com/research/s6qzt5/samsung_galaxy_s5 ) has announced ... Home Button Synaptics Fingerprint Sensor Technology Analysis" report ... Based on a totally different sensing ... first time a fingerprint sensor in its product. ...
(Date:12/17/2014)... , Dec. 16, 2014 Valencell, a leader in ... biometric technology to industry leaders such as Intel, Jabra, ... validated, biometric wearable products. These products will be showcased ... Las Vegas . "Our ...
Breaking Biology News(10 mins):Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 3Samsung Galaxy S5 - Home Button Synaptics Fingerprint Sensor Technology Analysis 2Valencell PerformTek Biometrics Power the Most Accurate Wearables at CES 2015 2
(Date:1/22/2015)... , Jan. 22, 2015   GenoSpace , a precision medicine ... to enable the broad use of genomic, imaging and other ... appointment of Michelle Munson , CEO of Aspera, an ... Logo - http://photos.prnewswire.com/prnh/20150122/170713 "We ...
(Date:12/24/2014)... 24, 2014  United Therapeutics Corporation (NASDAQ: UTHR ... MDT ) has submitted a pre-market approval application to ... use of Medtronic,s SynchroMed ® II implantable drug ... with United Therapeutics, Remodulin ® (treprostinil) Injection delivered ...
(Date:12/24/2014)...   BioLife Solutions , Inc. (NASDAQ: BLFS ), ... hypothermic storage and cryopreservation freeze media ... tissues  ("BioLife" or the "Company"), today announced that it will ... 2015 (the "Annual Meeting"). Because the expected date ...
(Date:12/24/2014)... 23, 2014 Earlier this year in a ... of the Adult Stem Cell Technology Center, LLC ( ASCTC ... unique property of adult tissue stem cells. His title ... Important for the Future,” embodied the essence of his message ...
Breaking Biology Technology:GenoSpace Expands Board with Appointment of Michelle Munson 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 3United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 4BioLife Solutions Sets Date for Annual Meeting of Stockholders 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 3Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 4
Cached News: