There was an SAE design with wing grid a couple years ago... my group thought about using them, but scrapped the idea and went with a 17.5 to 1 AR and whitcomb winglets... I really doubted those things and we didn't have time to do the research. The group that used wing grid had a very low aspect ratio wing of around 4 to 1 the plane crashed a couple hundred yards after takeoff... didn't carry much weight either.

Ty