Damen Marine Components System / Package
Flex Tunnel
Retractable stern tunnel for newbuild inland vessels, deployed at shallow draught to keep the propeller covered; about 10% propulsion efficiency improvement.
Description
The Flex Tunnel from Damen Marine Components is a retractable tunnel integrated into the hull, developed in 2010 with research institute DST Duisburg. It is deployed at shallow draught to ensure water flows over the propeller, and retracted when sailing at or near maximum draught to avoid the resistance of a fixed tunnel.
Key features
- Propulsion efficiency improvement of approximately 10%
- Longer operation in shallow water and/or more cargo during low-water periods
- Good manoeuvrability at low speed and shallow draught
- Enables smaller propellers and lower engine capacity
- Requires an adapted hull design; not suited to existing vessels
Applications
Newbuild inland vessels.
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