Page 8 - Aerotech News and Review 4-1-16
P. 8
Flying wing-shaped
experimental airplane
validating new wing
design method
CZ+BZ-FWJOF cept, Bowers, colleagues and students recorded NASA photograph by Tom Tschida
PRUHWKDQWKUHHKRXUVRIÀLJKWGDWD7KDWUHVHDUFK
NASA Armstrong Flight Research Center FRQ¿UPVWKDWWKHEHOOVKDSHGVSDQORDGLQJPHWKRG The streamers on the Prandtl-D No. 2 as it is launched illustrate how aerodynamic forces are
generates proverse yaw. Proverse yaw is thrust, PD[LPL]HGDVELUGVRYHUODSZLQJWLSVZKHQÀ\LQJLQIRUPDWLRQ
Future aircraft fuel efficiency could be dra- rather than drag, at the wingtips and makes the
matically increased thanks to ideas validated with aircraft’s tail unnecessary because of the design Transfer Program, which seeks to transfer knowl- RIÀLJKWEXWWXUQHGDZD\IURPWKDWPRGHOPRUH
increasingly complex subscale, experimental, and not because of the need for electronic con- HGJHLQWRDQGRXWRI1$6$WREHQH¿WWKHVSDFH than a century ago. Bowers contends that birds
remotely piloted aircraft at NASA’s Armstrong WUROV7KHUHVXOWLVJUHDWHUHI¿FLHQF\DQGWKHSR- program and U.S. Industry. NASA invites com- are the right place to look. Birds, for example,
Flight Research Center in California. tential to reimagine airplane design. panies to consider licensing the Prandtl-D innova- do not have vertical tails but manage coordinated
tions for further development and commercial ap- turns and their wings taper to narrow tips without
Flights are scheduled to resume this summer on Researchers, industry and academia can learn plications. More information is available through stalling. Unlike aircraft with standard elliptical
WKHÀ\LQJZLQJVKDSHG3ULPDU\5HVHDUFK$HURG\- how wing twist and a radically different bell- WKH1$6$$UPVWURQJ7HFKQRORJ\7UDQVIHU2I¿FH VSDQORDGZKLFKDFKLHYHVWKHEHVWHI¿FLHQF\LQ
namic Design to Lower Drag, or Prandtl-D No.3. shaped spanloading — the load distribution over DWRUE\HPDLODW')5&772# IRUPDWLRQÀLJKWE\WUDLOLQJRQHZLQJWLSGLUHFWO\
The project features a new wing design method the wing’s span — could lead to a substantial mail.nasa.gov EHKLQGDQRWKHUELUGVÀ\LQIRUPDWLRQZLWKWKHLU
and a twist. If the concept continues to prove its reduction in drag detailed in a technical paper wingtips overlapped. Prandtl-D demonstrates why
value, it could forward NASA’s research goals released in March. In addition to detailing how the Prandtl-D
WRSURYHWHFKQRORJLHVOHDGLQJWRVLJQL¿FDQWIXHO achieved its data, the paper asserts a corollary to See ARMSTRONG, Page 9
economy and emissions reduction. The NASA technical publication is entitled, ELUGV+XPDQV¿UVWORRNHGWRELUGVDVWKHPRGHO
“On Wings of the Minimum Induced Drag:
The NASA Aeronautics Research Mission Di- Spanload Implications for Aircraft and Birds,”
rectorate has provided funds for student assistance NASA/TP – 2016-219072. The publication can
ZLWKWKHÀLJKWUHVHDUFKWKDWKDVEHHQRQJRLQJIRU be requested electronically, or in paper form, from
more than three years at Armstrong. The Prandtl- 1$6$¶V6FLHQWL¿FDQG7HFKQLFDO,QIRUPDWLRQ2I-
D No. 3 is undergoing the addition of instrumenta- ¿FHDWRUE\HPDLODWKHOS#VWL
WLRQLQSUHSDUDWLRQIRUWKHXSFRPLQJÀLJKWVVDLG nasa.gov
Al Bowers, NASA Armstrong chief scientist and
Prandtl-D project manager. “The NASA technical paper is the right ap-
proach because we heartily encourage open access
Through a series of remotely controlled-sub- to the data,” Bowers said.
scale Prandtl-D models in 2013, 2014 and 2015,
several with sensors that validated aerodynamic The methodology detailed in the report is avail-
design merits and control expectations of the con- able for licensing through NASA’s Technology
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8 Aerotech News and Review April 1, 2016
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