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  2. de Havilland Propellers - Wikipedia

    en.wikipedia.org/wiki/De_Havilland_Propellers

    Used in conjunction with a heat exchanger, the units reduced the temperature of compressor-bleed air by more than 300 °C. The use of epoxy resin/glass fibre-reinforced plastics for airscrew spinners, blade root fairings and other components were also developed extensively by de Havilland Propellers Ltd. at their Stevenage plant. Dr.

  3. Marine propulsion - Wikipedia

    en.wikipedia.org/wiki/Marine_propulsion

    Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting of an electric motor or internal combustion engine driving a propeller, or less frequently, in pump-jets, an impeller.

  4. Variable-pitch propeller (marine) - Wikipedia

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

    A sailboat or motorsailer when voyaging on sail alone will benefit from reduced drag, and just like an aeronautical propeller, a marine VPP may be "feathered" to give the least water resistance when sailing without using power. A VPP is particularly useful when motorsailing (i.e. voyaging under both power and sail), as the VPP can be coarsened ...

  5. Folding propeller - Wikipedia

    en.wikipedia.org/wiki/Folding_propeller

    Folding propellers reduce drag while not in use, thereby allowing for more speed or reduced fuel consumption. Folding propellers are no more efficient than fixed blade propellers, and have much poorer performance in astern. Less noise and vibration than fixed blades when not in use, since fluid flow will not cause the propeller to rotate.

  6. 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 ...

  7. Composite propeller - Wikipedia

    en.wikipedia.org/wiki/Composite_propeller

    Composite materials may be considered an environmentally friendly option for propeller blades in some applications. While the composite blades are more resistant to corrosion and impact damage than many metal-alloy propeller blades, the water saturation and the propeller application decrease the longevity of composite propellers. [2] [3] [4]

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  9. Modular propeller - Wikipedia

    en.wikipedia.org/wiki/Modular_propeller

    Modular propellers may be fitted to aircraft as well as boats. [1] The benefits of a modular propeller are that its specifications (such as blade pitch or propeller diameter) may be altered to suit varying conditions; and it becomes much easier to replace damaged elements, such as a broken blade. Traditional one-piece propellers may be ...