Yanmar 8 hp fuel usage
As soon as speed increases above this number, fuel burn rises sharply.
![yanmar 8 hp fuel usage yanmar 8 hp fuel usage](https://www.marine-power.co.uk/image/cache/catalog/productimage/1GM10-800x800.jpg)
YANMAR 8 HP FUEL USAGE FULL
Full displacement boats live in this zone. At slow speeds (for the technically inclined, speeds below 1.3 times the square root of the waterline length), the boat sits fully in the water, riding between a wave at the bow and a wave at the stern. As speed increases, boats move through the water in three basic ways. These hull forms respond in very different ways to the demand for speed. Which offers the best fuel economy? To answer that question we have to introduce the most important variable of all: speed. Hull shapes can be sorted into three basic categories: full displacement, semi-displacement, and planing. The primary factors that influence how easily the hull can be moved include hull shape, length, total weight, and drag. The engine converts that energy into the power needed to overcome resistance and move the boat through the water.Īs for the boat, the more easily it moves through the water, the less energy is required. One gallon of diesel fuel stores about 38 kilowatt hours of energy, or 130,000 BTU. The fuel contains the stored energy and we can describe that in terms of horsepower (hp), kilowatts (kW), or British thermal units (BTU).
![yanmar 8 hp fuel usage yanmar 8 hp fuel usage](https://img.directindustry.com/images_di/photo-g/23424-15596224.jpg)
THE BASICSĪ given hull will require a certain amount of energy to move it through the water. For the purposes of this discussion, we will concentrate on nautical miles per gallon, which we will abbreviate to nMPG. In this particular example, we see that although the difference is minor, the boat burning more gallons per hour achieves better mileage. Let’s include the speed and look at the math.:īoat A: 10 knots (nautical miles per hour) / 11 GPH = 0.9 miles per gallonīoat B: 22 knots (nautical miles per hour) / 22 GPH = 1.0 miles per gallon Let’s return to the question of which boat is more efficient, Boat A burning 11 GPH, or Boat B burning 22 GPH.