Special rudder for the F126 frigate

Damen Naval, the main contractor for the four F126 frigates, has commissioned Damen Marine Components (DMC) to develop and produce the required rudder pairs for the combat vessels. They are intended to improve the hydrodynamic properties of the ships and withstand extreme impacts.

According to Damen, the DMC full spade rudders of the Atlantic type have been calculated according to the special hull shape and operational profile of these frigates. With their slim profile, the rudders reduce flow resistance and improve the F126's course keeping at high speeds, Damen continues. Good manoeuvrability at low speeds in harbours or during special operations of these naval vessels is maintained.

The Asymmetric Rudder Technology (ART) developed by DMC is used here. The leading edge of the rudder is asymmetrical, which means that the turbulent water flow between the propeller and rudder blade is channelled more evenly over the rudder surface. This reduces cavitation on the blade and the formation of vortices behind it, which reduces the ship's resistance and increases the efficiency of the rudders. As the F126 is equipped with two counter-rotating propellers, the rudders for each side are also designed in such a way that they direct the converging water flows into the wake to reduce turbulence. In addition, a "silent bulb" bow improves the flow behaviour of the entire ship and thus the thrust, especially at higher speeds.

Source: Damen Naval, editorial office defence industry, European security and technology