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  2. Ducted propeller - Wikipedia

    en.wikipedia.org/wiki/Ducted_propeller

    A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...

  3. Propeller (aeronautics) - Wikipedia

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

    Thin blade sections are used and the blades are swept back in a scimitar shape (scimitar propeller) in a manner similar to wing sweepback, so as to delay the onset of shockwaves as the blade tips approach the speed of sound. The maximum relative velocity is kept as low as possible by careful control of pitch to allow the blades to have large ...

  4. Supermarine Spitfire (early Merlin-powered variants) - Wikipedia

    en.wikipedia.org/wiki/Supermarine_Spitfire...

    The engine was a Rolls-Royce Merlin 47 driving a four-bladed Rotol propeller of 10 ft 9 in (3.27 m) diameter; the new propeller provided increased thrust at high altitudes, where the atmosphere is much thinner. To help smooth out airflow around the wingtips the standard rounded types were replaced by extended, pointed versions extending the ...

  5. List of SAP products - Wikipedia

    en.wikipedia.org/wiki/List_of_SAP_products

    SAP Integrated Business Planning (IBP) SAP Internet Transaction Server (ITS) SAP Incentive and Commission Management (ICM) SAP IT Operations Analytics (ITOA) [1] SAP Jam; SAP Knowledge Warehouse (KW) SAP Manufacturing; SAP Marketing Cloud; SAP Materials Management (MM), a module in SAP ERP Central Component (ECC), that provides companies with ...

  6. Blade solidity - Wikipedia

    en.wikipedia.org/wiki/Blade_solidity

    If an impeller has only a few blades (i.e a large pitch), it will result in less lift force and in a similar manner for more blades (i.e. very low pitch), there will be high drag force. Blade solidity should not be confused with rotor solidity , which is the ratio of the total area of the rotor blades to the swept area of the rotor.

  7. Voith Schneider Propeller - Wikipedia

    en.wikipedia.org/wiki/Voith_Schneider_Propeller

    The Voith Schneider propeller was originally a design for a hydro-electric turbine. [2] Its Austrian inventor, Ernst Schneider, had a chance meeting on a train with a manager at Voith's subsidiary St. Pölten works; this led to the turbine being investigated by Voith's engineers, who discovered that although it was no more efficient than other water turbines, Schneider's design worked well as ...

  8. Advance ratio - Wikipedia

    en.wikipedia.org/wiki/Advance_ratio

    Diameter of the propeller. The propeller advance ratio or coefficient is a dimensionless number used in aeronautics and marine hydrodynamics to describe the relationship between the speed at which a vehicle (like an airplane or a boat) is moving forward and the speed at which its propeller is turning.

  9. Rotor solidity - Wikipedia

    en.wikipedia.org/wiki/Rotor_solidity

    Rotor solidity is a dimensionless quantity used in design and analysis of rotorcraft, propellers and wind turbines.Rotor solidity is a function of the aspect ratio and number of blades in the rotor and is widely used as a parameter for ensuring geometric similarity in rotorcraft experiments.