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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. [32] If the drone crashes, the outer components are frangible, breaking to release energy [33] and impact the ground with less force. [34]

  3. List of aircraft propeller manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_aircraft_propeller...

    Banks Maxwell Propeller Company - United States; Bellissimo Custom Propellers - Ontario, Canada [1] Binder Motorenbau - Germany; Baoding Propeller Plant - People's Republic of China; Blackburn Aeroplane & Motor Co - UK; Bolly Props - Australia; Born Propeller - Germany; British Maxim - UK; Büttner Propeller - Germany

  4. 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 ...

  5. Propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Propeller_(aeronautics)

    A 6-bladed Hamilton Standard 568F propeller on an ATR 72 short-haul airliner. Lowry [27] quotes a propeller efficiency of about 73.5% at cruise for a Cessna 172.This is derived from his "Bootstrap approach" for analyzing the performance of light general aviation aircraft using fixed pitch or constant speed propellers.

  6. Unmanned aerial vehicles in the United States military

    en.wikipedia.org/wiki/Unmanned_aerial_vehicles...

    United States unmanned aerial vehicles demonstrators in 2005. As of January 2014, the United States military operates a large number of unmanned aerial vehicles (UAVs, also known as Unmanned Aircraft Systems [UAS]): 7,362 RQ-11 Ravens; 990 AeroVironment Wasp IIIs; 1,137 AeroVironment RQ-20 Pumas; 306 RQ-16 T-Hawk small UAS systems; 246 MQ-1 Predators; MQ-1C Gray Eagles; 126 MQ-9 Reapers; 491 ...

  7. Variable-pitch propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Variable-pitch_propeller...

    A constant-speed propeller is a variable-pitch propeller that automatically changes its blade pitch in order to maintain a chosen rotational speed, regardless of the operational conditions of the aircraft. This is achieved by use of a constant-speed unit (CSU) or propeller governor, which automatically changes the propeller's blade pitch.

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