In a breakthrough study commissioned by the Dutch Damen Group, external experts have confirmed the impressive performance of the SCHOTTEL RudderPropeller Dynamic (SRP-D). Conducted by the Maritime Research Institute Netherlands (MARIN), the research confirms the SRP-D’s significant advantages over conventional rudder propellers, particularly for Commissioning Service Operation Vessels (CSOVs). The results underscore the added value of SCHOTTEL’s cutting-edge technology in enhancing propulsion efficiency, thrust yield, and DP (Dynamic Positioning) performance while reducing fuel consumption and minimizing operational risks.
The study, conducted in a state-of-the-art offshore basin, found that the SRP-D’s innovative design yields significantly better propulsion performance than traditional rudder propellers. Not only did the SRP-D show a higher thrust yield, but it also demonstrated reduced “forbidden zones,” improving vessel positioning accuracy. These findings highlight the SRP-D’s crucial role in meeting the increased efficiency and reliability requirements of modern CSOVs.
Significant Thrust Yield and Reduced Forbidden Zones
The study’s results confirm a notable increase in thrust efficiency when using the SRP-D compared to conventional rudder propellers. The key difference lies in the SRP-D’s unique eight-degree tilt of the lower gearbox and its vertically integrated electric drive motor (LE-Drive). These modifications allow the SRP-D to achieve faster thrust allocation and more precise responses to external forces such as wind and currents, leading to higher positional accuracy for vessels operating in dynamic environments.
One of the most significant findings was the SRP-D’s ability to reduce thrust losses when operating in dynamic positioning mode. With the SRP-D, thrust losses in the transverse direction were reduced to just 10 percent, compared to 35 percent with traditional 90-degree thrusters. The reduced thrust losses were particularly evident in both azimuth variations and thrust variations, proving the SRP-D’s superior performance in maximizing thrust yield and reducing fuel consumption.
Propeller Flow Interactions and Thrust Losses
Another critical aspect of the study focused on propeller flow interactions. The research highlighted the significant reduction in thrust losses when using the SRP-D. The CSOV model with the 98-degree tilted thruster exhibited only 20 percent thrust losses when the wake was directed at the second thruster, compared to 50 percent losses with the 90-degree thruster. Additionally, transverse thrust losses were decreased by 40 percent when using the SRP-D, compared to 20 percent with the 98-degree variant, resulting in higher remaining force for DP operations.
These findings showcase the SRP-D’s ability to minimize the impact of thrust interactions between adjacent propulsion units. By reducing losses in both the transverse and in-line thrust directions, the SRP-D enhances vessel stability and fuel efficiency while maintaining superior dynamic positioning capabilities.
Enhanced Efficiency, Fuel Savings, and Safety
Beyond its thrust efficiency, the SRP-D’s design optimizes the overall efficiency of CSOVs. The eight-degree tilt of the gearbox significantly reduces the forbidden zones of the thrusters, allowing vessels to achieve better DP performance. This translates into improved vessel maneuverability and enhanced fuel efficiency, providing long-term cost savings for ship owners.
The research further demonstrates that CSOVs equipped with the SRP-D are capable of operating more safely and efficiently throughout the year, thanks to the reduced operational risks and fuel savings. By minimizing thrust losses and enhancing thrust distribution, the SRP-D enables vessels to operate in a wider range of conditions with reduced downtime and improved overall performance.
Damen and SCHOTTEL: A Strong Partnership for Optimized Vessels
Mark Couwenberg, Product Portfolio Manager for SOVs at Damen, emphasized the importance of the SRP-D in Damen’s continuous efforts to offer optimized vessels to their clients. “The SRP-D thrusters mounted under Damen’s optimized hulls result in vessels with a smaller footprint, reduced fuel use, and improved comfort on board,” he stated. “Combined with SCHOTTEL’s robust design methods, we are confident that our clients will enjoy life-long benefits from this innovative combination.”
The collaboration between Damen and SCHOTTEL exemplifies the maritime industry’s drive for innovation and sustainability. By integrating the SRP-D into their vessels, Damen can provide their clients with state-of-the-art technology that improves operational efficiency, reduces environmental impact, and enhances vessel performance.
SCHOTTEL: A Legacy of Innovation and Efficiency
SCHOTTEL, a global leader in steerable propulsion systems, has been at the forefront of marine propulsion innovation for more than 100 years. With a strong commitment to research and development, the company continues to refine its products and offer advanced propulsion solutions that deliver optimal performance for vessels of all types and sizes.
The company’s focus on continuous innovation, coupled with its long-standing expertise in the field, ensures that SCHOTTEL will continue to meet the evolving needs of the maritime industry. With a global presence and a reputation for excellence, SCHOTTEL remains dedicated to providing high-quality propulsion systems that improve the efficiency, reliability, and sustainability of vessels worldwide.
About SCHOTTEL
SCHOTTEL, founded in 1921 and headquartered in Spay, Germany, is a leading manufacturer of steerable propulsion systems for ships and offshore applications. The company specializes in developing and manufacturing azimuth propulsion systems with power ratings of up to 30 MW for vessels of all sizes. SCHOTTEL’s commitment to high product quality, innovative solutions, and local presence has earned the company a reputation for excellence in the maritime industry. With a focus on sustainability and efficiency, SCHOTTEL continues to shape the future of maritime propulsion through its cutting-edge technologies.
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