Wing with a wing grid as the end section

A wing comprising the combination of

• a main wing part having a substantially closed surface, a distal end, a chord, a first predetermined span and a predetermined orientation and predetermined attack angle relative to incident fluid flow for producing lift;
• and
• a tip portion at said distal end of said main wing part, said tip portion comprising:
• a grid of at least two spaced-apart winglets having a second predetermined span, said grid being attached to said distal end of said main wing part and extending the same lift per span unit of undisturbed two-dimensional flow around the profile of the main wing at the attachment to the grid's winglet tips, each of said winglets having substantially the same orientation relative to incident fluid flow as said main wing part, said second predetermined span being no greater than said first predetermined span,
• said winglets having an overlap ratio of winglet chord length to spacing from an adjacent winglet equal to less than one and a ratio of chord length to winglet spacing which is substantially constant along said winglet span where said spacing is measured leading edge to leading edge, and
• said winglets being vertically staggered relative to each other along a line unidirectionally angularly separated from a plane containing the chord of the main wing part.