Lego propellers are tested in water to find out which design delivers the most thrust. From worst to best, multiple propellers are compared for performance, with some surprising results. Non-Lego ...

Propellers are designed to take a fluid, generally air or water, and use a rotating motion to push that fluid through. They're evolutions, in a sense, from the Archimedes' screw, which was likely ...

The boat’s flat bottom and above-water propeller allow Wiberg and the other volunteers to get to places where other watercraft would get stuck. “We go across sandbars, across marsh, across grass.