The shorter a drone's propellers, the less efficient they are at keeping it airborne. That factor, along with compact, low-capacity batteries, is the reason that small drones can't fly for very long. A new two-prop drone, however, is claimed to deliver twice the flight time as similar-sized quadcopters.
.. Continue Reading Ring-shaped dual-prop drone boasts twice the flight time as quadcoptersCategory: Drones
from New Atlas (Gizmag) https://ift.tt/2liRrVw
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