Catamaran Hull Steps and Wave Splitter for Spray Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional catamaran boat hulls face issues with tunnel spray management, slamming loads, water exiting the tunnel, friction resistance, and landing performance in rough sea conditions due to their design, which affects stability and safety.
Innovation Solution
The design incorporates a pair of hull sponsons with an underside tunnel surface, longitudinal and transverse steps, and a wave splitter with spray rails to manage tunnel spray, reduce slamming loads, and enhance running characteristics by creating a channel for water flow and disrupting spray, while the stepped hull configuration and radiused chines improve friction resistance and tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional catamaran boat hulls use separated hull sponsons, then the boat can operate with shallow draft and maintain stability, but water pushes inward within the tunnel causing slamming loads on the bridge deck
Solution Approach 1:
The patent introduces an intermediary structure (wave splitter or tunnel spray management system) between the water and the bridge deck to intercept and redirect the water flow. This mediator prevents the direct impact of water against the bridge deck, thereby reducing slamming loads while preserving the separated hull sponson configuration that provides stability.
2Object-affected harmful factors
If conventional catamaran boat hulls use an underside wave splitter, then rising water is redirected before hitting the bridge deck, but water still exits the front of the tunnel creating dangerous spray conditions
Solution Approach 1:
The patent segments the tunnel spray management into multiple functional zones: the wave splitter handles water redirection at the tunnel entrance, while additional features (such as tunnel spray rails or modified tunnel geometry) manage the water flow along the tunnel length. This segmentation allows each component to address specific aspects of water management, preventing both slamming loads and dangerous spray exit.
3Speed
If conventional catamaran boat hulls use sharper entry features on hull sponsons, then the boat cuts through oncoming sea conditions better, but landings in rough sea conditions are less desirable
Solution Approach 1:
The patent applies different geometric qualities to different parts of the hull sponsons. The entry features (bow sections) are designed with sharper angles to cut through water effectively, while the landing sections (stern or chine areas) are designed with radiused or softer transitions to provide smoother landings. This local differentiation of geometric properties allows each region to optimize its function.
4Loss of energy
If conventional catamaran boat hulls use a stepped hull configuration, then friction on underwater running surfaces is reduced, but tracking and friction resistance can still be improved
Solution Approach 1:
The patent introduces dynamic or adaptive elements to the stepped hull configuration, such as adjustable step heights, variable deadrise angles, or flexible running surfaces that can adapt to different operating conditions. This allows the hull to optimize both friction reduction and tracking performance dynamically, rather than being fixed in a static configuration.
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
The solution effectively manages tunnel spray, reduces slamming loads, enhances running characteristics, and improves tracking and landing performance, leading to improved stability and safety in various sea conditions.
Implementation Method 1
The two longitudinal steps divide the sponson running surface into an aft sponson running surface section, a mid-hull sponson running surface section, and a forward hull sponson running surface section... The two transverse steps divide the aft sponson running surface section into an inner lifting pad running portion and two outer running surface portions
Implementation Method 2
an underside wave splitter disposed on a forward portion of the underside tunnel surface along the catamaran boat hull centerline, the underside wave splitter comprising a set of downward protruding side surfaces and a protruding aft surface... a set of spray rails disposed along the underside tunnel surface, wherein each of the spray rails extend from the protruding aft surface of the underside wave splitter and away from the catamaran boat hull centerline
Implementation Method 3
two longitudinal steps disposed at respectively different points along the keel and the sponson running surface, each of the two longitudinal steps running across a width WS of the first sponson or the second sponson... two transverse steps disposed lengthwise on opposing sides of the keel
Data Source
AI summary
Catamaran boat hulls are described having sponsons, an underside tunnel surface between sponsons, two longitudinal steps disposed across each sponson's keel, and two transverse steps disposed lengthwise on opposing sides of each sponson's keel. The longitudinal steps for a sponson have a profile with a curved longitudinal step portion on the opposing outer edges with an outer edge portion of that curved longitudinal step portion being further away from the sponson's aft section, and an inward step edge offset where each of the two longitudinal steps meets a hull side of the sponson. The transverse steps help define variable deadrise inner lifting pad running portion with a lower deadrise aft transitioning to a higher deadrise forward. Spray rails protruding off the aft end of an underside wave spitter and away from the boat hull's centerline help manage undesired spray and use of radiused chines enhances lift and landing performance.