KAMOME PROPELLER

CPP
Controllable Pitch Propeller

A SMART WAY OF USING A
CONTROLLABLE PITCH PROPELLER
Excellence in Ship Control for Increased Safety
Economy Improved by Control Optimized for Operational Conditions
Configuration of Environmentally Friendly Drive Systems

KAMOME PROPELLER A smart way of using a controllable pitch propeller

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Excellence in Ship Control PerformanceControllable pitch propellers make it is easy to secure necessary speeds for forward and backward
operations merely by controlling the pitch. They cover a complete range of operations including
full-speed sailing, low-speed sailing, and stop and backward sailing. These may be likened to automatic transmission gears for cars.
Controllable pitch propellers
allow the ship speed to be freelychanged in a non-step mannerby simply controlling the propeller pitch to ensure all types ofship operation, ranging fromfull-speed forward sailing tofull-speed backward sailing.
With fixed pitch propellers,
minimum revolutions of themain engine are limited. The
diagram below shows the ship
speed that may be continuously
maintained. Fixed pitch propellers do not support continuous
operation at low speed.

KAMOME PROPELLER A smart way of using a controllable pitch propeller2Moderate Operation for Improved Economy
Output required for propulsion varies constantly depending on the freight, sea conditions such astrailing or contrary wind and tide, fouling on the bottom of the ship and other factors.
With controllable pitch propellers, the pitch is controlled according to the load conditions toensure reasonable operation of the main engine.
As a ship carries more cargo and as its draft isdeeper, ship resistance increases. Contrary wind ortide necessitates higher output for propulsion formaintaining ship speed.
Controllable pitch propellers allow the main engine
to operate in a low load state in which fuel efficiency
is high by controlling the propeller pitch according
to the situation. They consequently cut energy
consumption by about 5-10% and improve
economy.
Controllable pitch propellers make it easy to make effective and optimal use of the characteristicsof the main engine in line with the ship’ s purpose, the operational conditions and the load conditions, and therefore conserve energy. For this purpose, many different control systems are available.

Automatic Load Control (ALC)
This system automaticallycontrols the propeller pitch tomaintain the load at the target
level set on the basis of theoutput and fuel consumption
characteristics of the main
engine.

KAMOME PROPELLER A smart way of using a controllable pitch propeller3Automatic Speed Control (ASC)This system automaticallykeeps the ship speed at apredetermined level by regulating the propeller pitch
while maintaining the revolutions of the engine or bycontrolling the revolutions
while maintaining the pitch inresponse to changes in shipspeed.

Program Control (PGM)
This system ensures reasonable operation of the engine
according the predetermined
control procedures for theoptimal propeller pitch andrevolutions even if the operator gives the command for
drastic pitch control.

KAMOME PROPELLER A smart way of using a controllable pitch propeller

4Environmentally Friendly Propulsion Systems
A controllable pitch controller enables the main engine to operate at constant revolution solely bypitch control. This paves the way for building a drive system with a fuel-efficient main engine todrive the power generator and hydraulic equipment. It also eliminates the need to operate anauxiliary engine to cut fuelconsumption, and ultimately
results in an environmentallyfriendly propulsion systemwith reduced CO2 and nitrogen oxide (NOx) emissions
from the main engine.

Advanced Quick Stop Performance for Enhanced Safety
To quickly stop the ship with a controllable pitch propeller, the operator need only shift from aforward propeller pitch to a reverse one or vice versa without changing revolutions. The ship can
be stopped in a short time at a short distance, half that of fixed pitch propellers. A shorter stopping
distance at the time of quick stop improves ship control and safety during emergency situations.
A fixed pitch propeller for quick stopping takes the following control steps.
1. Reduced revolutions
2. Clutch control(from forward to neutral, then to reverse)
3. Increased revolutions
Because of the ship’ s momentum it takes some time to
reduce propeller revolutions and to increase revolutions
for reverse movement. Therefore a longer stopping
distance is needed.
In narrow waterways or ports with many ships, controllable pitch propellers increase safety as theyensure unfailing ship collision prevention and other ship stop control during emergency situations.

KAMOME PROPELLER A smart way of using a controllable pitch propeller

5Ships equipped with controllable pitch propellers can be quickly stopped,
at a greatly reduced distance.

Smart installation of controllable pitch propellers brings thefollowing benefits• Ship control becomes easier and safety is improved.
• Fuel consumption lowers and economy increases.
• Environmentally friendly propulsion system is constructed with improved fuel eﬃciency
and lower CO2 and nitrogen oxide (NOx) emissions.
• Features of controllable pitch propellers are also applied to electric propulsion ships.

Kamome Propeller Co., Ltd.
http://www.kamome-propeller.co.jp/en/
690 Kamiyabe-cho, Totsuka-ku, Yokohama 245-8542 Japan
Phone: +81-45-811-2461
Fax: +81-45-811-9444

KAMOME PROPELLER A smart way of using a controllable pitch propeller

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