Wärtsilä Controllable Pitch Propeller Systems

• Optimal performance and efficiency, while minimizing noise and vibration levels
• Compact, well proven and robust hub designs
• High load capacity
• Reliable solution for dynamic positioning (DP) applications and all ice classes
• Complies with EPA Vessel Permit 2013 requirements (EAL application)
• Available with pollution free stern tube arrangement
• Easy installation
• Easy to maintain, the hub can be disassembled without removing the propeller shaft
• Optional with underwater replacement of propeller blades
• Intuitive operation when using Wärtsilä ProTouch control panels
• Increased fuel savings achieved with the Energopac, HP nozzle, feathering hubs and OPTI Design
• Lubrication system available with moisture content monitoring

Fitting a nozzle increases the thrust at relatively low ship speeds. This allows for significant savings to be achieved in terms of fuel consumption, depending on the number of revolutions and the capacity of the engine. The improved Wärtsilä High Performance nozzle, type HP nozzle, when combined with Wärtsilä propellers, can provide up to 5% more thrust than conventional nozzles in bollard pull conditions. The nozzle profile offers a double profiled cross section at the inlet side of the nozzle.

The HP nozzle can be combined with either fixed pitch or controllable pitch propeller systems, and are typically installed on heavy duty vessels, such as:

• Tugs and push boats
• Anchor Handling Ships
• Trawlers
• Dredgers
• Ice navigation vessels

and on low speed vessels such as:

• Inland navigation vessels
• General cargo vessels

Feathering propellers are applied to save fuel for multi-functional vessels that operate in such a way that one or two propellers are regularly out of use. The ability to position the propeller blades for feathering achieves less resistance and lower fuel consumption than with a Trailing or Blocked propeller.

TYPICAL APPLICATIONS

• Double ended ferry With propellers at both the bow and stern of the ferry, the foremost propeller is not in operation during transit.
• Twin screw vessels Twin screw container or cargo/RoRo vessels operating with one propeller at low speed for longer periods, for example when the sailing route involves both high and low speed operation.  
• Vessels with a booster propulsor Vessels with a centre propeller and wing thrusters have the possibility to operate on only the thrusters when a lower sailing speed is required.
• Vessels with alternative propulsion Sailing cruise vessels or sailing yachts use wind propulsion and feathering propellers to minimise resistance when the mechanical propulsion system is not in use.

An additional feature of a feathering propeller in a twin screw propulsion layout is the possibility to perform maintenance and overhaul on one of the shafts while continuing operations.