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  2. 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 ...

  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. 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 ...

  5. Single-blade propeller - Wikipedia

    en.wikipedia.org/wiki/Single-blade_propeller

    Single-blade propeller drawing Single-blade propeller and glider drawing. A single-blade propeller may be used on aircraft to generate thrust.Normally propellers are multi-blades but the simplicity of a single-blade propeller fits well on motorized gliders, because it permits the design of a smaller aperture of the glider fuselage for retraction of the power plant.

  6. Supercavitating propeller - Wikipedia

    en.wikipedia.org/wiki/Supercavitating_propeller

    An alternative to the supercavitating propeller is the surface piercing, or ventilated propeller. These propellers are designed to intentionally leave the water and entrain atmospheric air to fill the void, which means that the resulting gas layer on the forward face of the propeller blade consists of air instead of water vapour. Less energy is ...

  7. Performance Propellers - Wikipedia

    en.wikipedia.org/wiki/Performance_Propellers

    Performance Propellers, officially Performance Propellers USA, LLC, is an American manufacturer of wooden propellers for homebuilt and ultralight aircraft. The company headquarters is located in Donie, Texas and was formerly in Patagonia, Arizona. [1] [2]

  8. Moral Injury: The Grunts - The Huffington Post

    projects.huffingtonpost.com/moral-injury/the...

    Some troops leave the battlefield injured. Others return from war with mental wounds. Yet many of the 2 million Iraq and Afghanistan veterans suffer from a condition the Defense Department refuses to acknowledge: Moral injury.

  9. Coax-P - Wikipedia

    en.wikipedia.org/wiki/Coax-P

    The propeller increases thrust by 15-20% over single propellers and reduces noise levels, especially low frequency noise, while eliminating torque effects. [1] [2] [3] The propeller system was designed for ultralight trikes and powered parachutes. The latter are especially sensitive to torque effects and the propeller design addresses that ...