10736 Cory Lake Dr.

Tampa, FL 33647

Ph: 813-986-8100
Fax: 813-986-2600
Email: sales@marineoffshore.net

Twisted

The Hamburg-based Becker Marine Systems is the market leader for high-performance rudders and manoeuvring solutions for all types of ships. Becker’s reliable rudder systems are first choice for luxury yachts and super tankers as well as mega container ships, passenger ferries and large cruise vessels.

Over 110 specialists are employed worldwide at Becker offices located in Germany, China, Singapore, Korea and Norway. Additionally, a global network of agencies in almost every important centre of the ship building industry ensures competent consultancy and service to customers around the globe. Key factors for Becker’s market success are flexibility and strategic independence from shipyards or large industrial groups. This ensures that Becker can provide customers with the best technical, reliable, innovative and cost-effective products for any ship.

Mewis Duct
Schilling

FLAP RUDDER

The Becker Flap Rudder family consists of the classic Becker Flap Rudder and the Heracles Flap Rudder designs. The Becker Flap Rudder is the most popular rudder type worldwide and is derived from the innovative rudder developed by company founder Willi Becker. In combination with KSR bearing and twisted profile it is unlimited in size and speed. The Heracles Rudder is a Flap Rudder with closed linkage for enhanced safety, in icy conditions and sandy environments, for example.

These high-performance rudders have an optimum balance and flap area and thus offer top manoeuvrability and low fuel consumption.

TWISTED LEADING EDGE RUDDER

Conventional rudders are placed behind the propeller with the rudder cross section arranged symmetrically about the vertical rudder centre plane. However, this arrangement does not consider the fact that the propeller induces a strong rotational flow that impinges on the rudder blade. This results in areas of low pressure on the blade that induce cavitation and associated erosion problems. To avoid cavitation and to improve the manoeuvrability performance of a full spade rudder, Becker has enhanced the development of twisted leading edge rudder types.

More characteristics:

  Extended uncritical rudder angle sector
  No rudder horn, no gap cavitation
  Optimised profile
  Higher propulsion efficiency
  Reduced profile thickness

Becker rudder designs with twisted rudder profile: KSR support (Twisted Leading Edge Rudder TLKSR®, Twisted Leading Edge Flap Rudder TLFKSR)

SCHILLING® RUDDER

The new and optimized Schilling® Rudder profile offers further improved manoeuvring for all sizes and types of vessels. It is available as a full spade design (Schilling® MonoVec) or Schilling® KSR. The Schilling® Navigator Rudder closes the gap between conventional semi-spade and full spade rudders. The new Schilling® KSR Rudders offer large tankers and bulkers the advantages of the High-Lift Schilling® rudder profile and the enhanced manoeuvrability of a full spade rudder in combination with the KSR King Support Rudder.

Becker rudder designs with Becker Schilling® profiles:

  -Full spade (Schilling® MonoVec-C & VecTwin)
  -Full spade KSR support (Schilling® KSR)
  -Heel support (MonoVec-C)
  -HERUS® support (Schilling® Navigator)

Becker Schilling® Rudder profiles provide:

  -Exceptional full speed course-keeping ability
  -Reduced rudder “hunting” under autopilot operation
  -Significantly reduced overshoot angles
  -Reduced head reach and lateral deviation
  -Improved crabbing and zero-speed control, reducing reliance on tug assistance
  -Enhanced turning capability with significantly reduced turning circles at speed
  -Single-piece construction with no moving parts makes Schilling® ideally suited for all ice notations

MEWIS DUCT®

The Becker Mewis Duct® is a novel power-saving device developed for full-form slower ships that provides either significant fuel savings at a given speed or, alternatively, allows the vessel to travel faster at a given power level.

The Becker Mewis Duct® consists of two strong fixed elements mounted on the vessel: a duct positioned ahead of the propeller together with an integrated fin system within. The duct straightens and accelerates the hull wake into the propeller and also produces a net ahead thrust. The fin system provides a pre-swirl to the ship wake which reduces losses in propeller slipstream, resulting in an increase in propeller thrust at given propulsive power. Both effects contribute to each other.

The achievable power savings from the Becker Mewis Duct® are strongly dependent on propeller thrust loading, from 3% for multi-purpose ships up to 8% for tankers and bulkers. The power savings is virtually independent of ship draught and speed.

The Becker Mewis Duct® is ideally suited to both new-build and retrofit applications (e.g. Tankers, Bulkers and MPCs).

  -Improved propulsion
  -Proven fuel savings up to 8%
  -Reduced greenhouse gases (GHG)
  -No moving parts, no service necessary
  -Reduced vibrations & pressure pulses
  -Return on investment in approx. 1 year
  -Installation time approx. 4 days

KSR (King Support Rudder)

The KSR (King Support Rudder) design extends the trunk into the rudder blade and makes it possible for Becker’s full spade rudders, such as the TLKSR® Twisted Leading Edge Rudder, the FKSR Flap Rudder or the Schilling® KSR with unchallenged manoeuvrability to be supplied for vessels of any type and size. With the KSR design Becker can supply full spade rudders of practically any size.

Becker rudder profiles for the KSR design:

  -Becker Twisted Leading Edge Flap (TLFKSR)
  -Becker Twisted Leading Edge (TLKSR®)
  -Becker Flap (FKSR)
  -Schilling® KSR
  -NACA (KSR)

In order to avoid typical disadvantages of conventional rudders, Becker Marine Systems has developed the KSR (King Support Rudder) bearing arrangement concept. With this arrangement the trunk is extended into the rudder blade so that the lower neck bearing is positioned as close as possible to the vertical centre of pressure on the rudder. This results in reduced stresses and bending moments in the rudder blade as well as in the rudder stock.
The reaction forces in the neck and carrier bearings are much smaller, making it a very rigid rudder and with a consequently high natural frequency above the exciting frequency of the propeller, making the risk of the resonance very unlikely. Vibrations are reduced to a minimum.

KSR