Wärtsilä Controllable Pitch Propeller CPP

has a different hull form and for that reason
different wake fields. All Wärtsilä propellers are
wake-adapted and, in co-operation with the
customer, both yard and owner, the propeller
is designed for optimal performance in all
operating conditions.
The main features of the propeller design are:
• Highest propulsive efficiency in all operating
conditions
• Excellent behaviour regarding cavitation,
with no erosive types of cavitation
• Lowest pressure pulse fluctuations on the
hull to minimize noise and vibration levels
on board.
Wärtsilä controllable pitch propellers for all
ship types guarantee maximum efficiency and
minimum noise and vibration levels thanks to
their tailor-made design and use of the latest
state-of-the-art technology:
• A special radial loading distribution is used
to obtain high efficiency
• Unloading of the blade tip minimizes
cavitation and pressure pulses
• Optimized blade profile sections are
developed and used in the design and lead
to better results regarding both cavitation
behaviour and efficiency.
Wärtsilä’s design experience covers many
types of ships, varying from heavy-duty
vessels like hopper dredgers to high-speed
passenger ferries, and from small fishing
boats to enormous oil platforms carriers. Our
long history of designing propellers gives us
extensive hydrodynamic knowledge and we
have developed design tools based on a large
number of model test results and full-scale
measurements. Our research and development
efforts are dedicated to continuously improving
the hydrodynamic design of our propellers by:
• Co-operation with well known research
institutes and universities worldwide
• Full-scale measurements
• Simulation using Computational Fluid
Dynamics (CFD).
In order to fulfil the strength requirements of
the propellers we perform Finite Element (FEM)
analyses to check the blade strength properties
of each blade design. Both fatigue strength and
stresses in peak load conditions are checked.
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