|Search||Hot Links||What's New!|
Please let me remind all of you--this
material is copyrighted. Though partially funded by NASA, it is still a private
site. Therefore, before using our materials in any form, electronic or otherwise, you need
to ask permission.
There are two ways to browse the site: (1) use the search button above to find specific materials using keywords; or,
(2) go to specific headings like history, principles or careers at specific levels above and click on the button.
Teachers may go directly to the Teachers' Guide from the For Teachers button above or site browse as in (1) and (2).
Since the winggrid has a different topology
compared to other wing-tip devices, it is essential to classify
it and understand its effects.
|practical limit span_efficiency||Zimmer 83||Kroo 95||La Roche 96|
|parameter h/b compares vertical dimension h of configuration to span b||pure geometrical classification criteria||mix of geometry and downwash-wake criteria||downwash-wake parameters only
vortex-spacing and vortex-core
Spreiter & Sacks
|contour/straight||planar with nonplanar wake||contour|
|slotted edge/fanned partial||nonplanar
with h/b<0.05 for Winggrid
|N.A.||N.A.||closed multiple Winggrid/
second row explains assessment criteria of the different authors
span efficiency is the efficiency relative to an elliptical wing
N.A. = not available
95 = year of publication
H. Zimmer, The aerodynamic optimization of wings at subsonic speeds and the influence of wingtip design, NASA TM-88534 1987 (translation of dissertation, Stuttgart 83).
Ilan Kroo, John McMasters, Stephen C. Smith, Highly Nonplanar Lifting Systems, Transportation beyond 2000: technologies needed for engineering design, NASA Langley Research Center, Hampton, VA, September 26-28, 1995.
U. La Roche and S. Palffy, WING-GRID, a Novel Device for Reduction of Induced Drag on Wings, Proceedings ICAS 96, Sorrento, ITALY, September 8-13, 1996.
Back to winggrid
Send all comments to firstname.lastname@example.org
© 1995-2018 ALLSTAR Network. All rights reserved worldwide.
Updated: 31 January, 2007