4 ms·That's only true for multi-rotors. Fixed-wing drones can be fairly quiet.by icebraining 8y agoThat's only true for multi-rotors. Fixed-wing drones can be fairly quiet.skykooler 8y agoEspecially if they glide over the target, release the payload with a parachute, and only restart the propeller(s) once they're a ways away.jonfw 8y agoNo need for a parachute with the payloads that drug dealers are dropping.