Pop-Pop Boat https://physicsfunshop.com/ Birthday candle powered, super simple steam engine named after the sound it makes when operating. The engine is just a metal box, heated by the candle, with two pipes coming out of it. Steam builds up pushing water out with an explosive pop- which then creates a vacuum sucking more water in to repeat the process. Patented in 1915 these were very popular in the 1940's. ➡️ Follow the link above for info on where to buy this and other amazing items featured

They’re simple little things, but pop-pop boats are actually rather complex in nature - and interesting! Here’s how they move using steam and water. | Steve Mould

Pop-pop boats are great little toys. But could a life sized one actually work? | Steve Mould