MIT recently announced its research on toroidal propellers to ... was to adapt the toroidal shape for a PC fan. He was familiar with the idea from similar screws on boats that are commercially ...

A team at MIT’s Lincoln Lab has developed a new propeller shape that significantly reduces the noise associated with drones. [PDF via NewAtlas] Inspired by some of the experiments with “ring ...

also move by propellers in the water beneath their hulls. But when a hydroplane gets moving, the hull's design is what provides lift. As the speed increases, the wing-like shape of the boat causes ...