I am hill challenged, if it is good enough to soar from, my health prevents me from getting to it. However, dynamic soaring is totally interesting and I was considering the process.

I read an explanation about dynamic soaring (I believe that Joe Wurts has theorized this and I respect his knowledge) that involved moving the airplane between different velocity layers on the back side of the hill.

Assume a clock with 12 at the top of the hill and 6 at the bottom of the hill. The impression I got was that the velocity increment each pass was at roughly the 3 and 9 oclock positions as the airplane moved between the vertical volocity shears on the back side of the hill.

Could it be achieved by another mechanism? The airplane as it comes across the 1 to 11 oclock position could pick up velocity like the side thrust on a skaters blade.

It would certainly be interesting to put an accelerometer in the airplane and see where the increments in velocity come from.