Electric helicopters might soon be ready for prime time.In a world that is constantly changing, commercial aviation has remained remarkably boring. Commercial jets still use many of the same basic designs developed in the mid-20th century. And propeller-driven helicopters still use similar propulsion as when they launched in the 1940s. However, electric vertical takeoff and landing aircraft (eVTOLs) promise to bring some much-needed disruption to the industry. Instead of fossil fuels, these tiny aircraft ru ...