Undefined says its "silent" 70-dB drones will cause far fewer noise complaints in urban cargo delivery services than propeller-forced designs – although established drone delivery company Wing has ...
Undefined's next-gen "silent" ion propulsion drone: still noisy By Loz Blain May 02, 2022 The Ventus drone ionizes air to create lift without moving propulsors – Undefined Technologies says it'll be ...
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