21 Sep 2022, 10:21 UTC · By: Cristina Mircea / Undefined Technologies gets one step closer to commercializing its Silent Ventus ion-propulsion drone that promises to deliver minimum noise levels
2 May 2022, 10:03 UTC · By: Cristina Mircea / A Florida-based startup wants to create a less noisy urban environment with its Silent Ventus drone, powered by its proprietary ion propulsion technology