PROPELLER
The efficiency of a propeller takes an important place in the design process of the propulsion because its efficiency and the ship’s fuel consumption are directly related.

The efficiency depends on …
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Every propeller is designed individually based on the specific demands set for this propeller. As a result of this, there is a large variety in shapes of blades. Other issues to consider in propeller design are …
The propeller blades have a fixed position. As a consequence the direction of rotation of the propeller has to change if the ship stops or must go astern. This is realised with a reversing clutch or a reversible engine.
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We represent Nakashima Propeller from Okayama, Japan.
FIXED PITCH PROPELLERS
With its integrated technologies, Nakashima provides high-performance and high-quality propellers by optimally balancing propulsion efficiency, strength and vibration performance according to each customer’s special requirements with special focus on …
NHV EFFECT
Because of Nakashima’s unique technology, hub vortex causing energy loss and rudder erosion can be reduced by using specially shaped propeller blades, without the use of any special accessories. Reduced hub vortex improves efficiency and prevents rudder erosion.
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NHV Type
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Conventional Type
TIP RAKE EFFECT
The unique shape of the blade tip developed by Nakashima is expected to reduce cavitation and aft fluctuating pressure.
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NHV Type
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Conventional Type
HIGH SKEW EFFECT
Propellers with a sharp sweepback are called “high skew” propellers. Their unique shape reduces the vibration of a vessel's body as well as propeller noise.
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KEYLESS PROPELLER
With keyless propellers, no key is used to connect the rotating shaft and propeller. When the propeller shaft is press fit into the shaft hole of the propeller, the contact part becomes completely joined under specific conditions. Once the shaft and propeller are joined, the propeller is completely attached without being pressed back from the shaft. Since keyless systems are extremely reliable, most large-size merchant vessels use keyless propellers.
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Nakashima designs and manufactures environmentally friendly high-efficiency controllable pitch propellers. Our controllable pitch propellers developed utilizing the expertise and advanced technology accumulated in the development of fixed pitch propellers have been delivered to many customers in Japan and other countries.
FEATURES
The controlling blade angle enables the vessel to move forward or backward and stop more easily. When used with a side thruster, controllable pitch propellers are convenient when vessel speed needs to be changed frequently when entering or leaving port, leaving shore, or docking. In the case of an emergency stop, this type of propeller can immediately respond from full forward to full reverse movement.

Since the blade angle can be regulated, vessel speed can be freely adjusted with the engine running at the most efficient load. Use of a controllable pitch propeller can reduce fuel and NOx emissions. Due to these advantages, this type of propeller is used in a wide range of vessels, including fishing vessels, tankers, ferries, and tugboats.
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Nicomar GmbH
Herzog-Alf-Weg 16 b
D-22457 Hamburg

Managing Director:
Dipl.-Ing./MBA Ralf Nicolaisen

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