Fist-sized 11M-to-1 gearbox
Will this also work as a 1 to 11M gearbox?  If so it might allow a strong force (e.g. the weight of a large body of water) to spin a small electric generator.  That will allow small scale hydroelectric storage for renewable sources.If not it can probably still find some applications for turning something like weak wind power into something that can create great pressure.