Your speculation about motors is incorrect; motors are actually more efficient the larger you build them. It's a property of the goodness factor: https://en.wi

Your speculation about motors is incorrect; motors are actually more efficient the larger you build them. It's a property of the goodness factor: https://en.wikipedia.org/wiki/Goodness_factor https://en.wikipedia.org/wiki/Goodness_factor It is profoundly foolish to compare motors and heat engines on first principles like this, obviously. Still, here's a turbine that handles 30x the power of a jet engine, running a generator that is about the same size as a jet engine: https://www.ge.com/news/sites/default/files/Reports/uploads/2019/01/25132345/P1000089.jpg https://www.ge.com/news/sites/default/files/Reports/uploads/... generator is in the upper left. Obviously not at all optimized for size or weight- there aren't even any magnets in that thing.