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 marine areas, stirring to circulate seawater is considered effective. The "Density Flow Diffusion Device" is a new type of stirring and purification system for closed water bodies that utilizes density flow. By discharging mixed water, it enables stirring over a wide marine area. This system has been in practical operation maintenance-free since 1997, and various effects have been observed. **Proven Effects** - Improvement in 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 at 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 algal blooms due to the decrease in surface temperature.

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By applying the technology of ship propellers, we achieve high-efficiency stirring and utilize the natural phenomenon of density flow to generate water currents in closed water areas at low running costs. 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 algae blooms. It is also expected to suppress the abnormal proliferation of plankton in the sea, thereby mitigating the occurrence of red tide and blue tide.

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The main features, "high efficiency" and "quietness," are performance characteristics that have been created by maximizing the properties of the materials used. 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 design with about 1/5 the specific gravity of conventional materials, making installation easy. - Reduction of moment of inertia and lightweighting of the shaft system. High Strength - Higher fatigue strength than conventional materials, providing greater reliability. Low Vibration - Vibration is reduced due to lightweight design 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. High Efficiency - Lightweight design allows for easy increase in diameter, resulting in improved propeller performance. - Suppression of cavitation occurrence. Improved Maintainability - Keeping spare blades in stock allows for quick response in case of damage. - No specialized knowledge required for replacement, and repairs are 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, it has a simple structure and is easy to maintain and inspect. The overall system is also simple, making it easy to equip on the hull, and it can accommodate a diverse range of ships. 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. This provides convenience when frequent changes in ship speed are necessary, such as during entering and leaving ports or during docking and undocking, especially when combined with side thrusters. Additionally, in the event of an emergency stop, it can immediately respond from full forward to full reverse. By adjusting the wing angle, the engine can always operate at the most efficient load, allowing for free adjustment of the ship's speed. This can lead to reductions in fuel consumption and 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 customer 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, resulting in excellent maneuverability. Through a new blade design based on tank tests and improved strength, it has achieved 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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