A theoretical and experimental investigation and article was written up in
"Technical Soaring" (an SSA publication) in the early 1970's. It can be
done, but requires a medium high performance sailplane, very precise
maneuvering, and a strong wind to produce the necessary gradient.
Dan deVries
DEVRIES DESIGN, Inc.
Product Design --+-- Patent/Litigation Graphics
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>Let us assume the boundary layer from ground up
>is 300 ft (it varies with the type of ground below -
>the smooother the surface the thinner the boundary layer).
>And it varies with the wind speed of course!
>
>If I took a glider and started looping in wide circles -
>hitting 500 ft at the apex and maybe 100 ft at the nadir -
>straight into the wind - would I gain any energy? Would
>it be DS, as in Dynamic Soaring, or just BS, as in bull shit?
>
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