On Mon, 17 Jul 2017 19:26:40 -0400, Seymore4Head
wrote:

Does anyone watch "Horizon" from the BBC? In one of their latest
shows they have a glider attached to roll of string that is using wind
power to pull the string connected to a generator. It says it then
uses 5% of the energy to wind itself back up.



https://en.wikipedia.org/wiki/List_of_Horizon_episodes

.... couldn't find it.