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2. Zipline (drone delivery company) - Wikipedia

   en.wikipedia.org/wiki/Zipline_(drone_delivery...

   The drones have two propellers for redundancy and can fly safely on a single propeller or motor. A parachute that will bring the drone to the ground can be deployed if a larger set of faults occur. [51] If the drone crashes, the outer components are frangible, breaking to release energy [52] and impact the ground with less force. [53]

3. Sypaq Corvo Precision Payload Delivery System - Wikipedia

   en.wikipedia.org/wiki/Sypaq_Corvo_Precision...

   The Corvo Precision Payload Delivery System (PPDS) is a small aerial drone originally intended for logistics, weighs 2.4 kg (5.3 lb) empty, and deliveries payloads of up to 3 kilograms (6.6 lb). [1] The airframe is made of waxed foamcore (foamboard) and the drone is supplied as a self-assembly flatpack, complete with a tablet-PC control centre ...

4. Toroidal propeller - Wikipedia

   en.wikipedia.org/wiki/Toroidal_propeller

   A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...

5. Hubsan X4 - Wikipedia

   en.wikipedia.org/wiki/Hubsan_X4

   The Hubsan X4 is a series of very small, lightweight, remotely controlled quadcopters (sometimes considered unmanned aerial vehicles or "drones") which utilize four propellers (hence the "X4" designation) powered by a single lithium-polymer battery. Since the marketing of the first model, several upgrades and improvements have taken place, each ...

6. What we know about mysterious drone sightings - AOL

   www.aol.com/know-mysterious-drones-reported-over...

   Drone sightings have been reported in at least six states – New Jersey, New York, Connecticut, Pennsylvania, Virginia and Ohio – while arrests have been made in connection with drone operation ...

7. McCauley Propeller Systems - Wikipedia

   en.wikipedia.org/wiki/McCauley_Propeller_Systems

   McCauley Propeller Systems is an American aircraft propeller manufacturer, founded in Dayton, Ohio in 1938 by Ernest G. McCauley. [1] At its peak, it was reportedly the world's largest aircraft propeller manufacturer, [ 2 ] or at least the largest manufacturer of general aviation propellers.