I have had some correspondence form a gliding contact who was
referring to a recent satpic showing mountain wave. Bob wrote:

superb wave - what a show of free energy...(Bob was referrring to powered aircrafat being able to save fuel - I have actually done that myself)

But I had an inspiration and wrote back:

"Now there's an idea for a source of green energy. A fleet of
unmanned automated gliders to use the wave and then convert the huge
amounts of potential energy into electricity - I can't quite think
through that next step, but there could be possibilities."

Jack