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  2. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    Mercury Marine, Mercury Racing, Tohatsu, Yamaha Marine, Nissan and Evinrude each developed computer-controlled direct-injected two-stroke engines. Each brand boasts a different method of DI. Fuel economy on both direct-injected and four-stroke outboards measures from a 10 percent to 80 percent improvement compared with conventional two-strokes ...

  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. Fracking proppants - Wikipedia

    en.wikipedia.org/wiki/Fracking_proppants

    One manufacturer has claimed untreated sand fines production to be 23.9% compared with 8.2% for lightweight ceramic and 0.5% for their product. [3] One way to maintain an ideal mesh size (i.e. permeability) while having sufficient strength is to choose proppants of sufficient strength; sand might be coated with resin, to form curable resin ...

  5. Turboprop - Wikipedia

    en.wikipedia.org/wiki/Turboprop

    [4] [5] [6] Consequently, the exhaust jet produces about 10% of the total thrust. [7] A higher proportion of the thrust comes from the propeller at low speeds and less at higher speeds. [8] Turboprops have bypass ratios of 50–100, [9] [10] although the propulsion airflow is less clearly defined for propellers than for fans. [11] [12]