Watercraft Hull With Mixed Deadrise Panels For Rough Sea Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional watercraft designs face challenges in achieving high seakeeping, seakindliness, stability, and payload capacity while maintaining efficient planing lift and avoiding excessive slamming and discomfort in rough seas, particularly due to limitations in deadrise angles and hull configurations.
Innovation Solution
A watercraft hull design featuring a central planing hull with 0-degree deadrise longitudinal steps and ultra-high deadrise panels greater than 50 degrees, combined with fillet panels and ventilated aft swept flow interrupters, to enhance seakeeping and seakindliness while maintaining directional stability and planing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a watercraft uses a flat bottom planing hull with 0 degree deadrise angles, then planing lift efficiency is improved, but seakeeping and seakindliness in rough seas deteriorates
Solution Approach 1:
The patent applies different deadrise angles to different parts of the hull: the central planing hull portion has 0-degree deadrise for efficient planing lift, while the forward sections have ultra-high deadrise angles greater than 50 degrees for improved seakeeping. This local differentiation allows each section to perform its specialized function optimally.
2Reliability
If a watercraft uses a deep V hull bottom with high deadrise angles, then seakeeping and directional stability are improved, but planing lift efficiency deteriorates
Solution Approach 1:
The patent differentiates hull sections by assigning ultra-high deadrise angles (>50 degrees) to forward sections for wave penetration and seakeeping, while maintaining 0-degree deadrise on the central planing hull portion for optimal planing lift generation. This spatial differentiation resolves the contradiction between seakeeping and planing efficiency.
3Stability of the object's composition
If a watercraft heels to either side in rough seas, then directional stability may be affected, but the effective deadrise decreases causing increased slamming and pounding
Solution Approach 1:
The patent combines ultra-high deadrise panels with flat pad keel and longitudinal steps to create a composite hull structure. This merged design maintains effective deadrise even when heeled, reducing slamming while preserving directional stability through the integrated configuration of different hull sections.
4Adaptability or versatility
If a watercraft increases payload capacity, then utility and versatility are improved, but the hull may sink lower in water increasing drag and reducing speed
Solution Approach 1:
The patent segments the hull into multiple functional sections with different deadrise angles: ultra-high deadrise forward sections for wave cutting, 0-degree central planing sections for lift, and longitudinal steps for flow management. This segmentation allows the hull to maintain speed and performance characteristics even with increased payload capacity.
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 design improves seakeeping and seakindliness, reduces slamming, and maintains directional stability and planing efficiency, enabling the watercraft to operate effectively in rough seas with increased payload capacity and reduced discomfort.
Implementation Method 1
flat bottom planing hull surfaces with 0 degree deadrise angles are known to achieve the most efficient planing lift forces
Implementation Method 2
narrow watercraft hulls with ultra high deadrise angles greater than 50 degrees and typically greater than 60 degrees in forward sections are known to transit through waves by penetrating and slicing into them with less heave and pitch vertical motion excitation
Data Source
AI summary
The disclosed watercraft hull has a flat pad keel whose width tapers towards the bow and its width at the transom is 15% to 25% of the hull's width at its chines. The hull is symmetric about its centerline, has a fine entry bow, a transom, and a pair of hard chines. Between the pad keel and the chines the hull has at least one pair of generally flat panels referred to herein as longitudinal steps having approximately 0 degrees of deadrize forming planing surfaces symmetrically located about the hull centerline. The hull also includes at least one pair of ultra high deadrize panels, outboard of and adjacent to the pad keel, located symmetrically about the hull centerline, and extending therefrom to the flat planing panels above them. The ultra high deadrize panels have a minimum average deadrize of approximately 50 degrees measured along their length. Additional flat planing surface structures having approximately 0° deadrize may be installed longitudinally on the hull between the pad keel and the hard chine such that the vertical offset between any two planing surfaces along the hull's stagnation line does not exceed approximately six inches. High deadrize panels or fillet panels with deadrize angles of between about 0.20 and 35 degrees may be included in the hull outboard of and adjacent to the ultra high deadrize panels and located symmetrically about the hull centerline. The fillet panels are tapered into wedge shapes at their forward ends to blend into the adjacent ultra high deadrize and flat planing panels.