Boat Transom Projecting Portion for Outboard Motor Mounting
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Solution Overview
Problem
Conventional boats with outboard motors installed directly on the transom experience reduced propulsion efficiency due to increased water resistance when the propeller draws air, and it is challenging to install electronic units above the motor to protect them from water.
Innovation Solution
A boat body with a projecting portion on the rear transom supports the outboard motor at a higher and more rearward position, allowing the propeller to catch water flow effectively and reducing submersion, while enabling the electronic unit to be located above the water surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outboard motor is installed directly on the transom board, then the motor is positioned at a lower location, but the propeller draws air causing increased water resistance and reduced propulsion efficiency
Solution Approach 1:
The patent introduces a projecting portion that extends in the fore-and-aft direction from the transom board, creating a new spatial dimension for motor installation. This allows the motor to be positioned both higher and further aft simultaneously, resolving the contradiction between propulsion efficiency (requiring higher position) and installation feasibility (requiring lower position)
Solution Approach 2:
The projecting portion acts as an intermediary structure between the transom board and the outboard motor. It provides the necessary spatial offset to position the motor at an optimal location that improves propulsion efficiency while maintaining stable installation
2Reliability
If the outboard motor is installed at a lower position to prevent propeller from drawing air, then the propeller catches water flow, but the motor becomes more submerged increasing water resistance
Solution Approach 1:
By adding the fore-and-aft dimension through the projecting portion, the patent decouples the vertical position (affecting water contact) from the horizontal position (affecting submersion). The motor can be positioned higher to reduce submersion while the projecting portion ensures the propeller remains in the water flow
3Object-generated harmful factors
If the outboard motor is positioned higher to reduce submersion and water resistance, then propulsion efficiency improves, but the electronic unit becomes vulnerable to water
Solution Approach 1:
The projecting portion provides fore-and-aft separation that allows the motor (with electronic unit) to be positioned higher and aft, while the propeller remains lower and forward in the water flow. This spatial decoupling protects the electronic unit from water while maintaining propulsion efficiency
4Device complexity
If the outboard motor is installed directly on the transom board, then the structure is simple, but the deck space is reduced
Solution Approach 1:
The projecting portion utilizes the fore-and-aft dimension to relocate the motor installation point, allowing the transom board itself to maintain its original simple structure while the motor is positioned on the extended portion, thereby preserving deck space
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 enhances propulsion efficiency by minimizing water resistance, stabilizes the boat during turns, and protects the electronic unit from water, allowing for comfortable and efficient operation.
Implementation Method 1
water flow occurs such that water flows from a cutwater surface in the lower end portion of the transom board in a rearward direction along an upwardly curved path
Implementation Method 2
the projecting portion is submerged in the water thereby generating buoyancy at a rear portion of the boat
Data Source
AI summary
A boat body for a boat includes a projecting portion arranged to support one or more outboard motors at a position spaced upward and rearward from a transom. The projecting portion extends from a rear portion of the transom of the boat body, and the projecting portion supports the outboard motors at locations upward and further rearward than in a case where the outboard motors are directly installed on the transom. The projecting portion includes a projecting member that is bilaterally symmetrical and that decreases in width in a rearward direction and in an upward direction. The projecting portion includes a side thruster passing through the projecting portion in a horizontal direction. When viewed from the side, a lower edge portion of the projecting portion includes a slanting portion that is generally linear and that extends rearward and upward from a lower portion of the transom. When viewed from the rear, the lower edge portion of the projecting portion has a generally V-shape.