igenlode: The pirate sloop 'Horizon' from "Treasures of the Indies" (Default)
Igenlode Wordsmith ([personal profile] igenlode) wrote in [personal profile] watervole 2022-05-02 11:00 pm (UTC)

It might work if you had energy being supplied by interaction with an external force, space tethers being the obvious example, where you're getting 'free' energy from gravity and centrifugal force -- in practice you're presumably slowing the rotation of the planet slightly, so it's not a perpetual motion machine. You can 'harvest' energy by doing a slingshot around a planet, likewise imparting energy to the projectile at the cost of a tiny bit of the planet's own momentum...

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