Boat Hull With Deep V Keel And Side Chines
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Solution Overview
Problem
Existing hull designs for low drag boats face issues with increased drag at low speeds due to a raised bow, which disrupts wave formation and foam generation, and at high speeds due to additional drag from flaps, while also compromising stability and maneuverability.
Innovation Solution
A hull design featuring a deep V-shaped keel with a decreasing dead-rise angle to a flattened bottom that remains horizontal or inclined downward from the midship cross section to the stern, accompanied by side chines protruding downward, which captures waves and foam, maintaining trim and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the bow is raised to reduce wetted surface area and drag, then drag is reduced at high speeds, but wave formation and foam generation are disrupted and stability is compromised
Solution Approach 1:
The hull design allows the bow to dynamically adjust its position relative to the water surface based on operating conditions. At high speeds, the bow naturally rises to reduce wetted surface area and drag, while at low speeds the bow remains lower to maintain wave formation and foam generation. This dynamic behavior eliminates the need for fixed geometric compromises.
Solution Approach 2:
The invention changes the operating parameters of the hull by controlling the dead-rise angle variation along the keel. The dead-rise angle decreases from bow to stern, allowing the bow section to have a deeper V-shape for wave formation while the stern has a flatter bottom for stability. This parameter gradient enables different sections to optimize for different functions simultaneously.
2Use of energy by moving object
If a raised bow is used to reduce drag, then fuel consumption is reduced, but low speed performance and foam generation are compromised
Solution Approach 1:
The hull employs local quality variations along its length, with the bow section having a deep V-shape with high dead-rise angle for effective wave formation and foam generation at low speeds, while the stern section has a flatter bottom with low dead-rise angle for reduced drag at high speeds. This local differentiation allows each section to optimize for its specific functional requirements.
3Speed
If the dead-rise angle is increased to improve hydrodynamic support, then speed is increased, but drag friction increases due to disrupted foam
Solution Approach 1:
The hull design creates dynamic foam generation that adapts to operating conditions. At high speeds, the bow rises and generates turbulent flow that maintains foam in the wake region, which continues to reduce drag friction. The foam generation is not static but dynamically maintained through the hull's motion and wave interaction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces drag across various speeds by maintaining effective wave formation and foam generation while enhancing stability and maneuverability, balancing hydrodynamic support and minimizing trim changes.
Implementation Method 1
The front hull part has a deep V-shaped profile, with the central keel extending in after direction with the angle formed by the V-shaped profile increasing up to create a flattened bottom
Implementation Method 2
the foam provides the advantage of breaking the boundary layer formed by the surface friction and generate a turbulent flow that replaces the laminar flow
Implementation Method 3
The hull described by EP 1 501 718 should receive in its bottom the bow wave system and then recover some of the power consumed in forming that bow wave system in order to increase its hydrodynamic support and maintain a nearly horizontal trim
Data Source
AI summary
A hull for low drag boats has, from bow to stern, a deep V-shaped keel (10) whose dead-rise angle decreases up to a flattened bottom (30) in the stern, and sides (20) comprising side chines (200) protruding downward from the flattened bottom that is not inclined upwards.