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2. List of aircraft propeller manufacturers - Wikipedia

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

   Haw Propeller - Germany; Helices E-PROPS - Electravia - France (2008–present) Hélices Halter - France (1987-2014) Hamilton Standard - United States (1929-1999) Hamilton Sundstrand - United States (1999-2012) Hartzell Propeller - United States (1917–present) Hegy Propellers - United States; Heine Propellers - Germany; Helix-Carbon - Germany ...

3. 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 ...

4. 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.

5. Bernie Warnke Propellers - Wikipedia

   en.wikipedia.org/wiki/Bernie_Warnke_Propellers

   Bernie Warnke Propellers, founded by Bernie Warnke, is an American manufacturer of wooden propellers for homebuilt and aerobatic aircraft. The company headquarters is located in Tucson, Arizona. [1] Warnke makes propellers for engines up to 260 hp (194 kW) from maple laminates. [1]

6. Contra-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating_propellers

   Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...

7. 18-Year-Old N.J. Girl Dies After Being Struck by Boat ...

   www.aol.com/18-old-n-j-girl-215557492.html

   An 18-year-old New Jersey student was killed after she was hit by a boat propeller on the Jersey Shore over the weekend, just days before she was set to start at college, officials said.