Closed Linkage – a protected linkage mechanism for Becker's flap rudders

In a Becker Flaproder, the rudder’s movement is transmitted to the flap via a mechanical linkage mechanism. The mechanism operates continuously under high loads while being exposed to seawater, sediment, marine contaminants, and varying operating conditions. Closed Linkage is Becker Marine Systems’ solution for enclosing the entire linkage mechanism within the rudder blade. By protecting the moving components from the surrounding environment, wear is reduced while operational reliability is improved and component service life is extended.

Closed Linkage was developed for vessels where high availability, low maintenance costs, and a long service life are key requirements. The solution is used on Becker Flap rudders in both new construction and retrofit projects.

How does Closed Linkage work?

On a traditional flap rudder, parts of the linkage mechanism may be exposed to the surrounding water. With Closed Linkage, the entire mechanism is housed inside the rudder blade, where it is protected against corrosion, particle ingress, and mechanical stress.

The enclosed design helps reduce the risk of:

Corrosion
Mechanical wear
Accumulation of particles and deposits
Damage from external impacts

At the same time, the precise motion transfer between the rudder’s main profile and the flap is maintained, which is one of the most important features of Becker Flap Rudder.

When is Closed Linkage appropriate?

Since the linkage mechanism is a central part of a flap rudder’s function, Closed Linkage is particularly valuable on vessels where high operational reliability, low maintenance costs, and long service intervals are prioritized. The solution is often used on vessels that:

Operate in demanding waters
Operate intensively in ports or offshore
Have high availability requirements
Prioritize low life-cycle costs
Aim for long service intervals

Closed Linkage is commonly found on tugboats, offshore vessels, ferries, container ships, and other vessels equipped with Becker Flaproder.

Advantages of Closed Linkage

Protects the linkage mechanism from the marine environment.
Reduces corrosion and mechanical wear.
Extends the service life of moving components.
Maintains precise and reliable flap movement.
Contributes to lower maintenance requirements.
Increases operational reliability.
Integrated design solution for Becker Flaproder.