Conventional spade rudders

Types CB, CM and CS

This range of Rolls-Royce rudders are built as full spade rudders with three different standard profiles to ensure optimal manoeuvrability for passenger and cargo vessels and high-speed craft.

Type CB: Designed for lower speeds

A bulbous profile and large vane end plates improve low speed manoeuvrability. It shares the same profile as the FB flap rudder and is typically used for offshore supply, cargo, fishing and seismic vessels.


CB rudder for lower speed. Bulbous profile and large vane end-plates improves low-speed manoeuvring. Heel module option.



Type CM: Designed for medium speeds

The profile is optimised to provide good manoeuvrability with propulsive efficiency, with a tapered or rectangular blade. It has the same profile as the FM flap rudder and – with the FS – meets the rudder needs of passenger and cargo vessels, as well as high-speed craft.


CM rudder for medium speed. Medium profile optimises the proportion between manoeuvrability and propulsive efficiency. Tapered or rectangular blade.



Type CS: Designed for higher speeds

The slim profile increases overall propulsive efficiency and reduces cavitation risk. The blade is tapered with rounded corners. It has the same profile as the FS flap rudder.


CS rudder for higher speed. Slim profile increases overall propulsive efficiency and reduces cavitation risk. Tapered blade, rounded corners and smooth surface.




Available options

  • Trunk module with steering gear foundation
  • Automatic lubrication
  • Special bearings/liners
  • Heel connection module


Spade rudder – benefit summary

  • Designed for ease of installation
  • Suits all types of steering gear
  • Custom-built to fit the hull
  • Simple to maintain
  • Provides optimal performance at all speed ranges

Spade rudder – benefit summary

Basis of comparison:

1) Lift coefficient is dimensionless with mean propeller slipstream velocity. 2) Equal aspect-, taper- and thickness- ratio. 3) Rudder height equal to propeller diameter. 4) Rudder are placed in the propeller centre line. 5) Rudders are without vane end plates.

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