ナカシマプロペラ List of Products and Services

To prevent red tide, blue-green algae, and hydrogen sulfide, which are likely to occur in closed sea areas, it is considered effective to circulate seawater through agitation. The "Density Flow Diffusion Device" is a new type of agitation and purification system for closed water areas that utilizes density flow. By discharging mixed water, it is possible to agitate a wide sea area. This system has been in practical operation maintenance-free since 1997, and various effects have been observed. 【Proven Effects】 ■ Improvement of transparency ■ Decrease in surface water temperature ■ Suppression of abnormal proliferation of phytoplankton (red tide, blue-green algae) ■ Improvement of hypoxic water masses *For more details, please refer to the PDF document or feel free to contact us.

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By installing it on the surface of dams and lakes and generating water flow with propellers, it creates vertical water circulation within the water body. By mixing the cold, heavy water in the lower layers with the warm, light water at the surface, it is possible to alleviate low oxygen levels in the lower layers and suppress the occurrence of algae blooms due to the decrease in surface temperature.

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By applying the technology of ship propellers, we generate water flow in closed water areas at low running costs through high-efficiency stirring and the natural phenomenon of density flow. This creates water flow and vertical mixing within the water body, alleviating low oxygen levels in the lower layers and reducing the occurrence of surface algal blooms. It is also expected to suppress the abnormal proliferation of plankton in the sea, thereby controlling the occurrence of red tides and blue tides.

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The greatest features, "high efficiency" and "quietness," are performances created by maximizing the properties of the materials. In 2015, we received the Prime Minister's Award at the 6th Monozukuri Nippon Grand Award for the development of the world's first carbon fiber reinforced plastic propeller installed on a commercial ship that achieves energy conservation. Lightweight - Achieved lightweight due to a specific gravity of about 1/5 that of conventional materials, making installation easy. - Reduction of moment of inertia and lightweighting of the shaft system. High Strength - Higher fatigue strength and reliability compared to conventional materials. Low Vibration - Vibration is reduced due to lightweighting and high damping rate. - Improvement of living environment. Overload Reduction - The shape of the blades deforms to match the flow, reducing overload during rough weather and other conditions. High Efficiency - Lightweighting allows for easy increase in diameter, achieving improved propeller performance. - Suppression of cavitation occurrence. Improved Maintainability - By stocking spare blades, quick response is possible even in case of damage. - No specialized knowledge required for replacement, and repairs are also possible.

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It is compatible with hydraulic motors, electric motors, and diesel engines as drive mechanisms, and is adopted by a wide variety of ships. Being a fixed pitch propeller, its structure is simple, and maintenance and inspection are easy. Since the entire system is also simple, installation on the hull is straightforward, making it suitable for a diverse range of vessels. By adopting optimal propeller specifications that match the drive mechanism, it improves the overall efficiency of the system, making it an environmentally friendly propulsion device.

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**Features** By controlling the wing angle, it becomes easy to move forward, stop, and reverse. When combined with side thrusters, it offers convenience in situations where frequent changes in ship speed are necessary, such as during entering and leaving ports or during docking and undocking. Additionally, it can respond immediately from full forward to full reverse during emergency stops. By adjusting the wing angle, the engine can always operate at the most efficient load, allowing for free adjustment of the ship's speed, which can lead to fuel savings and reductions in NOx emissions. Due to these advantages, it is widely adopted in various types of vessels, including fishing boats, tankers, ferries, and tugboats.

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The hub vortex generated at the rear end of the cap due to the circumferential flow originating from the propeller's trailing edge causes energy loss. In an effort to diffuse the hub vortex and recover the loss, over 500 different cap shapes were tested and designed, ultimately showing the most effectiveness with a cap shape equipped with multiple wings, which became the prototype for the ECO-Cap.

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By combining Nakashima's technology, we can provide high-performance and high-quality propellers that optimize the balance of propeller efficiency, vibration, and strength according to our customers' needs. 1. NHV Effect 2. Chip Rake Effect 3. High Skew Effect 4. Keyless Propeller

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The "TCT" is a high-performance tunnel-type side thruster that controls the direction and magnitude of thrust by adjusting the angle of the propeller blades, providing excellent maneuverability. With a new blade design based on tank tests and improved strength, it achieves a significant increase in thrust compared to conventional thrusters. The propeller blades can be easily replaced within the tunnel by removing the mounting bolts. Additionally, the thruster body can be removed from the vessel for maintenance and inspection on land. 【Features】 ■ Increased thrust ■ Easy installation ■ Low vibration and low noise ■ Streamlined maintenance and inspection *For more details, please download the PDF or feel free to contact us.

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