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| Whether you're relaxing on your yacht or hard at work - worrying about your propulsion or generator engine is the last thing you want to do. That's why recreational and commercial boat owners have been relying on John Deere engines for more than 30 years. John Deere PowerTech engines are quiet, reliable, and require minimal maintenance. And they are backed by a company you can count on for service and support - no matter where you explore or work. They also offer easy access for routine maintenance. John Deere is a major engine supplier in a variety of marine machines: propulsion of commercial vessels or pleasure boats, auxiliary applications like pumps, hoists and gensets.
Hull Types
Boats perform in the water based on the physical shape of the hull, and how it sits in the water. The two extremes of hull designs are displacement hulls and planing hulls. Between these extremes are designs referred to as semi-displacement and semi-planing hulls.
Displacement hulls push through the water as they have no hydrodynamic lift, or the boat does not rise out of the water as speed increases. The maximum speed of these hulls is between 1 and 1.5 times the square root of the boat length based on hull design.
Planing hulls typically have a flat bottom, and are designed to run on top of the water at high speeds. The hull design (shape) does not limit the maximum attainable speed. Few boats have true planing hulls.
Semi-displacement or semi-planing hulls have features of both planing and displacement hulls. They have a maximum hull design speed. Exceeding this speed can result in erratic handling and unstable operation. There is not one hull design characteristic that differentiates semi-displacement from semi-planing hull. The greater the hydrodynamic lift and higher the hull design speed the more likely it will be referred to as a semi-planing hull. |
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| Diesel Engines for Recreational Applications |
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| Diesel Engines Commercial Applications |
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| Diesel Engines for Marine Generator Drives |
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