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The Swedish and Finnish (maritime) authorities have drawn up rules with respect to the required engine capacity for vessels with an Ice Class. Starting point for that is that ships can maintain sufficient speed during an ice drift using only their own power. The required engine capacity is calculated using a formula with the following parameters: the dimensions of the ship, in combination with the draft; the propeller dimensions; and the hull shape. The formula is based on experiences with standard vessels. Therefore, different shapes of ships and propulsion methods are not taken into account.
The ECO 6500 design is the result of the design philosophy of transporting the largest possible cargo in number of tons with the lowest possible fuel consumption. Besides an innovative hull shape, the design also includes a so-called nozzle. This is a pipe that has been fitted around the propeller, resulting in better use of the propulsion force. The effects of such a nozzle are particularly substantial at low speeds; the effect diminishes at higher speeds.
The previously mentioned authorities allow the installation of a lower engine capacity in a vessel, provided it can be demonstrated by means of model tests that the installed capacity is actually sufficient for maintaining the prescribed speed in an ice drift. These tests have been carried out for the ECO 6500 design.
Tests have shown that the pointed bow with the steep frames and steep verticals, push the ice to the side and lead it around the ship. This is in contrast to the traditional shape of a ship, which pushes the ice to the side and lead it around the ship. This is in contrast to the traditional shape of a ship, which pushes part of the ice under the ship, as a result of which this ice rises to the surface behind the ship and is lead through the propeller. Furthermore, the absence of the so-called (usually round and blunt) bulbous bow results in reduced resistance of the ship in an ice drift.
The calculated value for the required installed engine capacity is more than 1100 kW. The standard calculation gives a required installed capacity of approximately 3,300 kW.
In order to realise a reference speed of at least 12 knots in open water, an installed capacity of 1499 kW is required. Consequently, it was opted for an engine capacity of 1499 kW.
Tests have shown that the pointed bow with the steep frames and steep verticals, push the ice to the side and lead it around the ship. This is in contrast to the traditional shape of a ship, which pushes.
Also check out our special website about the eco 6500
