Eight High-Spec Sock-Resistant Systems
Damen Marine Components (DMC) has been contracted to design, engineer and manufacture eight shock-proof rudders for the German Navy’s F126 high-speed frigates, currently in construction.
The full spade rudders of the Atlantic type are purpose-designed for the frigates, to fit their specific hull form and operational profile. of these naval vessels. Relatively slim in profile, to reduce drag and improve course-keeping at high speeds, the rudders will maintain good manoeuvrability at low speeds in harbours or during special operations, and they incorporate DMC’s Asymmetric Rudder Technology (ART). This means the rudder’s leading edge will be asymmetric, directing turbulent water flow from the propellers along the rudder surface more smoothly, reducing cavitation and drag while increasing rudder efficiency.
Further efficiency improvements stem from the Silent Bulb, incorporated in the rudders right in the wake of the propeller axis. This is an energy saving addition to the rudder profile, positioned on the centre line of the propeller, improving water flow from the propeller and increasing thrust at higher loads. The design of the bulb is significantly influenced by the distance to the propeller, and is shaped to fit perfectly with the propeller hub.
A particular requirement of the F126 is that the entire vessel be built to resist extreme shock. The rudders are therefore designed to withstand enormous shock loads. Based on extensive computational calculations, critical areas have been strengthened and special welding details applied. High strength steel of the best quality is used for construction, honouring the classification rules for naval ships.
“With these twin-screw high-speed vessels, we can demonstrate the quality, efficiency and durability of our rudders. Being part of this high-profile Damen project allows us to show our capacity of delivering the highest class of ship systems,” commented DMC Sales and Marketing Director, Wim Knoester.