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  2. Contra-rotating marine propellers - Wikipedia

    en.wikipedia.org/wiki/Contra-rotating_marine...

    ABB provided an azimuth thruster for ShinNihonkai Ferries in form of the CRP Azipod, [2] claiming efficiency gains from the propeller (about 10% increase [3]) and a simpler hull design. Volvo Penta have launched the IPS (Inboard Performance System), [4] an integrated diesel, transmission and pulling contra-rotating propellers for motor yachts.

  3. 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 ...

  4. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Ring sizes can be measured physically by a paper, plastic, or metal ring sizer (as a gauge) or by measuring the inner diameter of a ring that already fits. Ring sticks are tools used to measure the inner size of a ring, and are typically made from plastic, delrin , wood, aluminium, or of multiple materials.

  5. 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 ...

  6. Sterndrive - Wikipedia

    en.wikipedia.org/wiki/Sterndrive

    A sterndrive or inboard/outboard drive (I/O) is a form of marine propulsion which combines inboard power with outboard drive. The engine sits just forward of the transom while the drive unit ( outdrive or drive leg ) lies outside the hull .

  7. Forward Drive - Wikipedia

    en.wikipedia.org/wiki/Forward_Drive

    The drive unit transmits power from the inboard engine, generally mounted above the waterline, outboard through the transom and downward to the propellers below the waterline. [1] The propellers lie about 27 inches further forward than the props of a Duoprop and move from an exposed position beyond the transom to underneath the hull, away from ...