RE: Flying wing gliding in high winds
F/F = Free Flight. ie, uncontrolled. I begin to see that you want to release an R/C wing from 35,000 ft and fly it down to the ground. Unless it is autonomous, it's gunna be a difficult to see, yes? It would need a degree of self stability, which your average 'Zagi' type does not have, and a programmed heading to seek. I forsee a degree of difficulty, it's really cold at 35,000, and there is not a lot of air to be had, most of it is underneath you that far up, so although IAS will be the same as sea level TAS (and therefore speed over the ground) will be considerably higher. These questions you have could be answered with a search of the usual aerodynamics data bases, NASA etc. This is likely not the forum for thse questions, someone will have done this before, and most of the UAV's already operate in this area, so the answers should be 'out there'.
Evan, WB #12.