RINA Concept Uses Main Engine for More Than Propulsion

by Ship & Bunker News Team
Friday August 28, 2026

RINA has unveiled a new ship propulsion concept that allows the main engine to generate onboard power, reducing the need to run auxiliary engines.

Called Mermaid, the concept combines a shaft generator, propeller shaft clutch and battery storage with the vessel’s two-stroke main engine, it said in a press release on Thursday.

When the ship is in port, the propeller can be disconnected while the main engine continues running. It can then supply electricity to the vessel or charge the batteries, which can provide power once the engine is shut down.

The setup is designed to cut bunker fuel use, emissions and operating costs while making better use of the main engine.

RINA said its analysis shows the concept could save more than 1,000 mt of fuel a year in some applications.

The system can also help optimise propulsion during slow steaming by matching engine power more closely with actual operating conditions.

Mermaid is fuel agnostic and can be used across vessel types including tankers, bulk carriers and container ships.

RINA is now developing the concept into a detailed design after receiving feedback from shipowners and shipyards.

Ship & Bunker News Team
To contact the editor responsible for this story email us at [email protected]