Hi Guys,
Everyone always says how wind tunnels take a LOT of energey to run!
What if the wind tunnel was sort of toroidal in shape? the air you push forward would come back around at you with still some energy. Would this makes things much me efficient in terms of energy?
I see the main flaw being moving the air round a bend would cause all sorts of nonsense and dodgey flow.
Feasible?
edit*
See this diagram of what look to be your standard tunnel... would making this more toroidal in shape give better efficiency?