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  2. Yanmar 2GM20 - Wikipedia

    en.wikipedia.org/wiki/Yanmar_2GM20

    It is a four-stroke, vertical, water-cooled diesel engine. It is built around two cylinders (hence the "2" in 2GM20) of 75 mm in diameter and 72 mm in stroke, adding up to 0.635 litres in displacement: each cylinder is roughly the size and volume of a 300 ml soft-drink can.

  3. G-W Invader - Wikipedia

    en.wikipedia.org/wiki/G-W_Invader

    G-W Invader, (sometimes listed as GW Invader), began production in 1967 with its 10-foot and 16-foot boats.The "G-W" indicated the last names of the founders. The initial designs of 10 and 16 footers were that of sport racing boats with a very low profile, low weight, and shallow draft.

  4. 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.

  5. 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 ...

  6. Propeller - Wikipedia

    en.wikipedia.org/wiki/Propeller

    An advanced type of propeller used on the American Los Angeles-class submarine as well as the German Type 212 submarine is called a skewback propeller. As in the scimitar blades used on some aircraft, the blade tips of a skewback propeller are swept back against the direction of rotation. In addition, the blades are tilted rearward along the ...

  7. 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 .

  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. Volvo Penta - Wikipedia

    en.wikipedia.org/wiki/Volvo_Penta

    In 2005, Volvo Penta launched the first IPS (Inboard Performance System) engine, a new "pod type" boat drive system with counter rotating forward-facing propellers operated by a joystick. Its engines are used by more than 140 boat manufacturers, [ 4 ] including Tiara Yachts , Fairline Boats , Sunseeker, Riviera, Four Winns, Sea Ray, Hanse ...

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