What do you get when you combine a cheap RC boat from Walmart, foam board, a couple powerful motors, and some aluminum cans? Most people would just end up with a pile of garbage, but we’ve already ...

Steel is scarce. Wood is not an option. And you need a boat now. These wartime circumstances drove innovation in all kinds of crazy directions, and one somewhat less crazy direction — concrete boats.

YouTube Peter Sripol built a subscale, working model of the Ekranoplan KM, or Caspian Sea Monster. The Ekranoplan was a ground effect vehicle designed to ride a cushion of air over a flat surface such ...