We also have a direct line to Santa so watch the implied insults. Everyone knows that RC glider fliers fly gliders because they can't keep a motor running:-)

That illustration is good. From a088008I and below are good data. Above that, welllllll.... they tried:-).

I had read some theories that had the increase in velocity coming from going between energy layers, but it did not take into account the airplane angle when it hits the air over the lip of the hill where energy is imparted at a high rate in the form of load factor. It is like swinging a weight around your head and only putting a little pull on the string in the same 30 degrees of arc. You can get it going really fast with the same pull each time until a aero drag limit is hit. In this case the gain in gravity on the back side of the loop would be lost in the climb so the only increase comes from the lip action (pun intended - OK not much of a pun, sorry). It would imply that a reallllly light airplane could not dynamic soar since it would always tend to revert to the local flow velocity too quickly. Does that sound reasonable?

It would be exciting to watch. Considering that the airplane rapidly reaches speeds that would keep a brick flying and the load factors involved are near awesome, the airfoil choice would be something that would have minimal drag and yet a thick enough section to hold together under the g loading. Solid carbon fiber might be in order! I would love to see these things in action. My mental simulator tells me it is a little frightening. The sounds must be great. I believe Joe Wurts designed a flying wing to use for training in this kind of flight.