Becker Schilling®* KSR Rudder.


Recent extensive Computational Fluid Dynamics (CFD) work have led to an improved Schilling® Rudder profile. The CFD research was part of the development of the new Schilling® KSR and Schilling® Navigator Rudder systems.

The improved profile en­hances the advantages of the Schilling® design:

  • Reduced drag at full scale
  • Preserves the already excellent lift characteristics
  • Moves the main thickness of the section aft to house the KSR bearing

All calculations were performed at full scale and proved a rudder drag reduction at normal cruising helm angles by approx. 25%, with the lift (side force) identical to the original section. A new concave streamlined fishtail is incorporated, which improves the flow separation characteristics compared to previous fishtail designs. Also, the main thickness of the section has been moved further aft, eliminating the requirement for additional strength ‘bulges’ for faster vessels and/or cases with highly loaded propellers. Further research work with particular emphasis on the leading edge performance under heavy propeller load resulted in an optimised profile. The detailed end-plate optimisations are carried out individually to suit particular operational scenarios.

The Becker Schilling®* concept.

The Schilling® Rudder is a high-lift rudder, designed for vessels of any size, and supplied in single or multiple configurations. Being of a single piece construction with optimised shape and no moving parts, the Schilling® Rudder dramatically improves both course-keeping and vessel control characteristics. With operating angles up to 70° port and starboard, the Schilling® Rudder can control the propulsive force to achieve an efficient “side thrust” effect at a ship’s stern.

The enhanced levels of ship handling and control achieved with the Schilling® Rudder system gives ship owners and operators access to a range of long term operating, cost and safety benefits.

The unique profile of the Schilling® Rudder incorporates:

  • New enhanced high-lift low drag profile
  • A rounded leading edge promoting good flow properties at all rudder angles
  • A fishtail trailing edge that accelerates the flow and recovers lift over the aft section of the rudder
  • End and optional intermediate plates to control propeller slipstream
  • High rudder balance optimising propeller coverage
  • Fully welded steel construction of the rudder blade
  • Rudder blade to stock connection by keyless conical or flange coupling
  • Single or multiple bearing support with no moving parts


About 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.