Introduction
The document introduces the FLEX Tunnel System, a registered trademark of Damen Marine Components, part of the Damen Shipyards Group. It highlights the system's ability to enhance vessel performance by improving propulsion efficiency and performance in shallow waters.

Specifications and Features
The FLEX Tunnel is a retractable system designed to optimize the aft ship, reducing hull resistance and achieving significant fuel savings. Key features include improved water flow to propellers, increased efficiency, resistance reduction, and significant fuel savings. The system is particularly suited for newbuild vessels on inland waterways.

Operational Benefits
The retractable nature of the FLEX Tunnel allows captains to choose when to deploy it, optimizing vessel performance. The airtight seal ensures sufficient water flow to the propeller, maintaining effective operation even in shallow waters with minimal cargo.

Development and Testing
The FLEX Tunnel concept was developed in 2010 in collaboration with DST Duisburg. It underwent extensive testing at various water depths and speeds, demonstrating higher operational efficiency for the entire vessel.

Integration and Compatibility
The FLEX Tunnel requires a customized hull design and is not suitable for existing vessels. It is designed to integrate with Van der Velden® XR rudders and XR spoiler for optimal efficiency and fuel savings.

Conclusion
The FLEX Tunnel System represents a significant innovation in marine engineering, offering enhanced efficiency and fuel savings for newbuild vessels on inland waterways.