Although there was briefly a company called Rotary Rocket, the term is much better known as a nickname for the Mazda RX-7 — one of the few cars that used a Wankel, or rotary, engine. If you ever ...

MIT engineers have demonstrated the first fully 3D-printed, droplet-emitting electrospray engine. The device, which would be ideal for enabling small satellites to make in-orbit maneuvers, can be ...