Each Energopac is designed to fit the vessel and to meet its specific requirements
The key objective of the Energopac is to reduce the vessel’s fuel consumption by fully integrating the design of both the propeller and rudder for reaching optimum energy efficiency, whilst not compromising either the vessel’s manoeuvrability or its comfort levels.
Energopac reduces fuel consumption because it reduces flow separation behind the propeller hub in an effective way. Extended studies show that for the same course-keeping capabilities, Energopac will create less drag than conventional rudder systems.
Especially when using small – corrective – steering forces to keep your vessel on course, the difference in rudder resistance is significant. The high-lift performance of Energopac requires smaller steering angles and consequently reduces rudder resistance.
The application of Energopac gives more freedom to create high efficiency from conflicting requirements. High performance propellerdesigns are often a compromise between increased efficiency and reduced vibration levels. Energopac allows for a propeller design, that gives the optimal balance between these requirements.
Energopac will effectively reduce the operational costs for any vessel with a considerable share of free sailing time in its operational profile. Additionally, it will work very well for propellers with a relatively large propeller hub.
The potential savings are large for vessels with highly loaded controllable pitch propeller systems, such as RoRo-vessels, ferries, container / multipurpose vessels, and vessels with an ice class notation.
The reduction in fuel consumption depends very much on the vessel type, the operational profile of the vessel, and also on the reference propeller and rudder. For any application, the power savings can beestimated by Wärtsilä. The estimate is based on the vessel design, operational profile and other requirements. Proven savings in required power for a vessel’s trial speed vary between 2–9% with Energopac.