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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.
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Updated: 31 January, 2007