related to this topic, here is a very interesting little external combustion engine that runs on the heat from a flame directly (i.e. not a steam engine) https

related to this topic, here is a very interesting little external combustion engine that runs on the heat from a flame directly (i.e. not a steam engine) https://i.4cdn.org/b/1789145070031855.mp4 https://i.4cdn.org/b/1789145070031855.mp4 (completely SFW) (links to 4chan expire in a day or so, so if anybody has a better link for this, future generations will be able to see it too)