Becker Bulb Rudders improved Propulsion efficiency with tOP manoeuvrability IMO Tier 2, VGP, EEDI and SEEMP are some examples of the increasing number of environmental regulations and guidelines coming out recently. All of these target the overall reduction of emissions caused by vessels during operation at sea. As the world leader for manoeuvring and energy-saving devices, Becker Marine Systems is a very strong partner in the market for environmentally friendly and money-saving technologies. Due to its longtime experience, Becker Marine Systems is able to provide customised rudder solutions for every type of vessel and operational profile. Replacing a vessel’s conventional half spade or full spade rudder with a Becker bulb rudder will increase its propulsion efficiency by approx. 3-4%. It also turns the rudder arrangement into a highperformance propulsion/manoeuvring package. The main benefits are: • No rudder-induced hub cavitation • Reduced rotational losses in the slipstream • Reduced hub vortex losses • Reduced vibration and noise Playa de Ris for PEVASA with 14 m2 twisted rudder with integrated bulb

Bulb Rudders better performance with bulb rudders Ship rudders are generally situated in complex, highly turbulent flow fields. This offers opportunities for significant power savings by recovering some of the associated flow energy losses through careful design of the propulsion and steering system. The Becker rudder bulb provides such an optimised solution. The rudder bulb system consists of a streamlined bulb fixed at the leading edge of the full spade rudder, which is situated aft of the propeller hub. The transition between bulb and propeller hub is bridged by a fairing cap. The integrated...

Bulb Rudders Proven performance during model tests Our research and development department is able to simulate the performance behaviour of the whole vessel prior to model tests or sea trials. Computational Fluid Dynamic (CFD) simulations of propeller/rudder setups with customised rudder bulb and twisted leading edge design have shown a reduction in power requirements of approx. 4% when compared to conventional rudder designs. Comparative model tests of bulb rudders and conventional full and half spade rudders at different towing tank facilities have revealed propulsion efficiency improvements...

Bulb Rudders A 95 m2 TLKSR® (twisted rudder) with rudder bulb will be installed on the new 16,000 TEU MSC container vessel references Becker bulb rudders installed on several types of ships (container vessels, multi-purpose vessels, RoRo ferries and PCTCs) are showing good results in power savings and reliability. Our energy saving devices, the Becker Mewis Duct® for full-form slower vessels and Becker Twisted Fin® for slender, faster vessels, can be combined with bulb rudders and reduce the demand for main engine power by an additional 1-4%. In order to get the best possible performance from...