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1- Assistant professor, Technical and Engineering Faculty, Science and Research Branch, Islamic Azad University, Tehran, Iran; samaei@srbiau.ac.ir
2- Assistant professor, Department of Marine industries, Science and Research Branch, Islamic Azad University, Tehran, Iran; m.asadian@srbiau.ac.ir
2- Assistant professor, Department of Marine industries, Science and Research Branch, Islamic Azad University, Tehran, Iran; m.asadian@srbiau.ac.ir
Abstract: (41 Views)
The demand for high-speed crafts has grown rapidly due to their strategic importance and quick response capabilities. Governments prioritize their development through research and industry advancements. Designing a high-speed craft exceeding 60 knots requires significant time and cost. This study identifies key factors for optimizing speed and maneuverability through hull modifications, chine positions, indentations, propulsion systems, and initial trim adjustments. The sample craft was 3D scanned, and simulations were conducted using MAXSURF. The hull was modified and uniformly adjusted, followed by hydrostatic and hydrodynamic calculations.
Findings indicate that achieving speeds above 60 knots require a minimum initial trim of 0.4° at the transom. Proper hull line adjustments and equipment placement were essential. Additionally, with a safety factor of 1.25, the craft requires approximately 600 horsepower for the desired speed. These optimizations ensure efficient performance while minimizing costs.
Findings indicate that achieving speeds above 60 knots require a minimum initial trim of 0.4° at the transom. Proper hull line adjustments and equipment placement were essential. Additionally, with a safety factor of 1.25, the craft requires approximately 600 horsepower for the desired speed. These optimizations ensure efficient performance while minimizing costs.
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Highlights
- A detailed 3D scan and modeling of a fiberglass high-speed craft prototype enabled the reconstruction and refinement of hull geometry for performance analysis.
- Hydrostatic and hydrodynamic calculations revealed that a minimum trim angle of 1.25° (5/4°) is required to exceed 60 knots, while preserving maneuverability and stability.
- The optimal resistance was observed at approximately 5.22 knots, beyond which resistance sharply increased, requiring enhanced propulsion strategies.
- Hull and internal layout modifications, including transom wall elevation and inner keel cover adjustments, were necessary to prevent water ingress during high-trim operation.
- A minimum of 475 hp effective power is needed to reach the design speed; a safety factor of 1.25 results in the use of two 300 hp engines.
- Outboard engines equipped with manual trim jacks allow fine-tuning of trim settings in real-time, minimizing startup resistance and improving planing conditions.
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