Diverting just slightly...

One of the things that confused me, and which took a while to get straight in my head is the relationship -

Induced Drag > Velocity > profile drag.

As I play round in the realms of ff glider, and this is right at the bottom of the drag bucket... profile drag is very low due to the low airspeed, and induced drag is high because of the "high" Cl numbers (typically 1.0 - 1.3). Consequently you see no modern F1x models with aspect ratios of less that 12 or even 15.

The ideal solution, one which I am still figuring, would seem to be a polyhedral wing where the tip "fits into" the vortex at glide speed... [sm=idea.gif]