Electric Kayak Drive Layout for Shallow Draught and Stability
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Solution Overview
Problem
Existing kayak designs with auxiliary engines face challenges such as increased draught, weight, and reduced controllability due to the placement of electric drive modules, which affects stability and energy efficiency, and often require complex assembly and are noisy and polluting.
Innovation Solution
A kayak design featuring an electric engine coupled with a propeller, where the engine is mounted on a vertically flat supporting frame at the stern and connected to a gearbox, with the battery placed in a waterproof box at the bow, allowing for even weight distribution and easy control without relinquishing the paddle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric engine is placed under the bottom of the kayak, then the additional drive is achieved, but the draught of the vessel is deepened
Solution Approach 1:
The patent transitions from placing the engine in the traditional bottom-center position (vertical dimension) to positioning it at the stern (horizontal dimension). The engine is mounted on the transom or stern structure, utilizing the horizontal space at the rear of the kayak rather than deepening the vertical draft, thus providing propulsion without increasing water immersion depth.
Solution Approach 2:
The patent introduces a shaft extending from the stern-mounted engine through the hull to reach the propeller position. This shaft acts as an intermediary mechanical element that transmits power from the engine (positioned at the stern for shallow draft) to the propeller (positioned at the optimal hydrodynamic location), resolving the contradiction between engine placement and propeller effectiveness.
2Device complexity
If the drive module is placed under the seat in the gravity center, then the engine is positioned centrally, but the weight distribution is unbalanced and stability is reduced
Solution Approach 1:
The patent moves the heavy engine component from the central longitudinal position (under the seat) to the stern (rear end) of the kayak. This spatial repositioning in the longitudinal dimension creates a balanced weight distribution where the heavy engine at the stern is counterbalanced by the paddler's weight in the crew chamber, achieving both simple installation and optimal stability.
3Use of energy by moving object
If the batteries are placed alongside the seat, then the energy source is accessible, but the width of the kayak is increased
Solution Approach 1:
The patent relocates the batteries from the lateral position (alongside the seat, increasing width) to the longitudinal position (in the bow or front section) of the kayak. This repositioning utilizes the unused forward space in the longitudinal dimension, maintaining narrow width for speed while ensuring battery accessibility through the bow area.
4Length of moving object
If the shaft is made long to connect the engine to the propeller, then the engine can be positioned further from the propeller, but the weight and energy consumption increase
Solution Approach 1:
The patent positions the engine as close as possible to the optimal propeller location, minimizing the shaft length to the essential minimum required for proper mechanical connection. This partial action approach uses the shortest necessary shaft length rather than extending it unnecessarily, thereby reducing weight and energy consumption while still achieving the required engine-to-propeller connection.
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 enhances efficiency for longer distances and counter-flow sailing, maintains low weight, and improves controllability without deep water requirements, while allowing for seamless control of the auxiliary drive without unhanding the paddle.
Implementation Method 1
electric engine (23), which is coupled with a propeller (27)
Implementation Method 2
screw- propeller (27)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A kayak with additional drive formed with a hull (1) whose part is a bottom (11) and a deck (12) in which is formed a crew chamber (102) equipped with a seat (13) and which is equipped not only with an electric engine (23), which is coupled with a screw-propeller (27), but also with a battery (33), which is electrically conductive way connected with the electric engine (23), where the electric engine (23) is placed on a supporting frame (2) in the back end part of the kayak and is, by the help of at least a drive element (26), which is.by its end part waterproof way freely pivoted in the stern of the kayak in axial direction, coupled with the screw-propeller (27), whereas the battery (33) is placed in a battery box (3) which is placed in the front end part of the kayak.