Florida-based startup Undefined Technologies has announced that its eVTOL ion propulsion drone Silent Ventus has successfully completed a critical test flight hitting its projected flight time and lifting power, marking this a major milestone for the emerging dual-use cargo delivery drone. During the 4-1/2 minute flight, the aircraft demonstrated its flight performance beyond reaching steady-state conditions - with higher efficiency power delivery systems and noise levels below 75 dB. Undefined Technologies aims to achieve flights of 15-minutes of duration with noise levels below 70 dB by the end of the next year, overcoming noise restrictions for the last-mile cargo delivery sector. Noise is the second biggest environmental factor causing health problems after only air pollution, according to the WHO report, and the UN report in February declared urban noise pollution one of the world's "top emerging environmental threats”. From the beginning, the company has followed a strict vertical integration model by designing and manufacturing its components in-house to speed up development, protect its intellectual property, and minimize supply chain disruptions in the current world environment. The core element of the aircraft is the so-called "Ion Booster," which generates the ion cloud to yield higher levels of thrust, up to 150% compared to current ion thruster technologies. The "boost" of thrust generated by the innovative technology creates a technical and commercial opportunity for ion thrusters to become a viable option for electric propulsion. The company has already demonstrated having the infrastructure and the talent to bring the eVTOL craft into commercialization for civil and military applications. It aims to develop a production-ready serial drone in 2024. After receiving strong interest from Federal and Commercial entities, Undefined Technologies is posed to start a new funding round.