Standardized, streamlined, and stability-approved
When the propulsion systems on three 15-meter jet boats reached the end of their lifecycle, Allswater was engaged to conduct an options analysis and provide a roadmap for retrofitting the vessels with new, efficient and effective propulsion systems. The goal was to select and evaluate various jet propulsion package options, ensure they met performance and stability requirements, and determine the feasibility of installation within the existing engine compartments.
Challenge
Each vessel had unique characteristics, with two being close sister ships and the third featuring a smaller engine room. The key challenges included:
- Limited space: The vessel with the smallest engine room served as the baseline, as major modifications to its structure were not permitted.
- Standardization requirement: The owner wanted the same or similar propulsion systems across all three vessels to streamline maintenance and reduce downtime.
- Complex installation: Integrating a new propulsion system required a precise fit without interfering with existing structural and mechanical components.
Solution
To address these challenges, Allswater implemented a structured approach:
- LiDAR scanning of all three vessels to capture engine room layouts and existing system configurations.
- Point cloud 3D modelling to test the placement of different propulsion systems and identify potential clashes, tolerances, and interferences.
- Options analysis, evaluating performance, stability, and feasibility for installation without significant structural modifications.
- Technical documentation, including:
- General Arrangement
- Machinery Arrangement layouts
- Fuel Oil System Diagrams
- Propulsion system installation specifications
- Stability calculations and documentation to ensure regulatory compliance
- 3D model of engine package components and point cloud of engine room envelope(s)
- 3D Finite Element Analysis (FEA) for assessing stresses in the hull structure imposed by the newly installed equipment.
Results
Allswater’s engineering analysis enabled a practical, space-efficient propulsion upgrade plan. The selected system ensured:
- Seamless installation across all three vessels, avoiding costly structural modifications.
- Operational efficiency by standardizing propulsion components to simplify maintenance and reduce downtime.
- Regulatory compliance through detailed FEA modelling, documentation, and technical specifications.
In post-delivery feedback, the client reported a noticeable improvement in vessel handling—particularly the ease of getting onto plane and exceeding performance requirements. They were especially pleased with Allswater’s recommendation to add an active interceptor system, which improved bow control and provided enhanced dynamic stability.
By leveraging 3D scanning technology and a methodical engineering approach, Allswater delivered a clear, actionable roadmap for retrofitting these vessels, ensuring long-term performance and maintainability.