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Van der Velden® FLEX Tunnel

Van der Velden Marine Systems has introduced an innovative new retractable tunnel developed specially for inland vessels. A Van der Velden® FLEX tunnel embedded into the hull of the vessel lowers resistance and increases efficiency.
Tunnels are commonly used on inland ships, ensuring optimal water flow to the propellers at shallow draughts. The downside of conventional tunnels is an increase in hull resistance, lower efficiency and increased fuel consumption. Moreover, inland ships are loaded and therefore sail in deeper water conditions for about 85 percent of the time, during which a tunnel is superfluous. The Van der Velden® FLEX tunnel is deployed when sailing in shallow waters to ensure sufficient water flow to the propellers and maintain their efficiency.

Van der Velden® DOLPHIN XR

The Van der Velden® FLEX Tunnel is designed to be combined and integrated with the Van der Velden® DOLPHIN XR rudder and spoiler. This complete package ensures optimal efficiency and thus considerable fuel savings. Van der Velden developed the retractable tunnel in close cooperation with the renowned German research institute DST (Development centre for Ship Technology and transport systems).

Benefits

  • Considerable fuel saving
  • Less resistance
  • Improved manoeuvrability and velocity
  • Propulsion efficiency of about 10%
  • Increased cargo space and loading capacity