Inflatable Boat V-Groove Bottom for Shallow Water Propeller Protection
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Solution Overview
Problem
Existing inflatable boats with outboard motors face limitations in low water conditions due to the motor propeller's position below the boat bottom, leading to restricted bank tying and potential propeller damage, as well as suboptimal fuel consumption due to the dimensions of the axissymmetric groove in the bottom.
Innovation Solution
The design features a U-shaped hull with an inflatable bottom having a V-shaped groove that reduces depth uniformly towards the nose, with a groove length of 5 to 20% of the boat bottom, an angle of the groove's inclined plane not exceeding 30°, and angular opening of lateral sides not exceeding 45°, allowing water to flow upward and positioning the propeller closer to the surface, reducing the vessel's draft and providing protection against underwater obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor propeller is positioned below the boat bottom, then the boat can operate in normal water conditions, but the boat cannot be tied to banks in low water conditions and the propeller is vulnerable to damage from underwater obstacles
Solution Approach 1:
The groove transforms the flat bottom surface into a three-dimensional V-shaped structure, creating a new spatial dimension for water flow management. This dimensional change allows water to be directed upward toward the propeller while maintaining a reduced draft configuration that enables operation in shallow waters and protection from underwater obstacles.
Solution Approach 2:
The groove geometry parameters (depth 5-20% of bottom length, inclination angle ≤30°, lateral opening angle ≤45°) are optimized to control water flow characteristics. These parameter changes create the necessary flow dynamics to lift water to the propeller while maintaining reduced draft for shallow water operation.
2Use of energy by moving object
If a standard axissymmetric groove is used in the boat bottom, then the boat can operate in various water conditions, but fuel consumption is excessive due to suboptimal groove dimensions
Solution Approach 1:
The groove parameters are precisely optimized: depth equals 5-20% of bottom length, inclination angle does not exceed 30°, and lateral opening angle does not exceed 45°. These parameter changes create optimal water flow characteristics that reduce resistance and improve propulsion efficiency, directly reducing fuel consumption while maintaining operational productivity.
Solution Approach 2:
The groove creates a localized region of optimized hydrodynamics at the stern, where water flow is specifically directed and controlled. This local quality improvement in water flow management reduces overall energy consumption without requiring changes to the entire boat structure.
3Loss of energy
If the groove depth is reduced uniformly towards the bottom nose, then water resistance is optimized and fuel consumption is reduced, but the groove geometry becomes more complex to manufacture
Solution Approach 1:
The groove depth is defined as a specific proportion (5-20% of bottom length) with uniform reduction toward the nose, and the angles are constrained to maximum values (30° inclination, 45° lateral opening). These parameter specifications provide clear manufacturing guidelines that balance energy efficiency with fabrication simplicity, allowing the complex geometry to be produced with standard manufacturing tolerances.
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 configuration reduces fuel consumption by 3% compared to standard designs, enables operation in shallows, and protects the propeller from mechanical damage, expanding the boat's usage specifications.
Implementation Method 1
the groove is V-shaped in cross-section, the depth hereof is reduced uniformly in direction to the bottom nose... allowing water to flow upward
Data Source
AI summary
An inflatable boat with a motor mount for use in shallow water conditions. The inflatable boat with the motor mount has a U-shaped hull in plan view, which is formed by open outline of inflatable boards and nose, as well as a transom installed on the boat stern and an inflatable bottom attached to the hull from below, and which bottom has an axissymmetric groove laying longitudinally from the stern end. The groove is V-shaped in cross-section. The depth of the groove is reduced uniformly in direction to the bottom nose. The inflatable boat according to the present invention allows expansion of usage specifications of the inflatable boats with motor mount, provides an additional guard for the outboard motors installed on them against possible mechanical damages and lowers fuel consumption in comparison with the boats of similar design.