Steerable Saildrive Control for Speed-Adaptive Sailboat Turning
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Solution Overview
Problem
Conventional sailboat steering systems lack the ability to dynamically adjust rudder and saildrive angles in response to varying boat speeds, limiting maneuverability and stability, especially during turns where hydrodynamic forces affect hull direction.
Innovation Solution
A sailboat steering system incorporating a steerable saildrive, a control lever for propeller speed control, a rudder angle sensor, and an electronic control unit that adjusts the saildrive steering angle based on the rudder angle and propeller speed, allowing independent control of rudder and saildrive angles to optimize turning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rudder angle and saildrive angle are controlled independently with fixed ratios, then the steering system is simple to operate, but the maneuverability and stability are limited at varying speeds
Solution Approach 1:
The patent implements dynamic angle ratio adjustment where the relationship between rudder angle and saildrive angle changes based on boat speed. At low speeds, a higher ratio provides stronger steering support for better maneuverability, while at high speeds, a lower ratio maintains stability. This dynamic adaptation resolves the contradiction by allowing simple operation through automatic adjustment while achieving versatile performance across different speed conditions.
Solution Approach 2:
The system changes the control parameter (angle ratio between rudder and saildrive) based on operating conditions (boat speed). The electronic control unit automatically adjusts the saildrive angle as a percentage of the rudder angle depending on the speed mode, transforming a fixed-parameter system into a variable-parameter system that adapts to different maneuvering requirements.
2Reliability
If the steerable saildrive rotates simultaneously with the rudder in a fixed mechanical linkage, then the steering support is consistent, but the turning radius cannot be optimized at different speeds
Solution Approach 1:
The patent replaces fixed mechanical linkage with a dynamic control system that adjusts the saildrive rotation angle based on boat speed. The electronic control unit calculates optimal angles in real-time, maintaining reliable steering support through consistent control logic while enabling optimized turning radius at different speeds by varying the angle ratio dynamically.
Solution Approach 2:
The system substitutes mechanical fixed-ratio linkage with an electronic control system that calculates and commands saildrive angles based on speed-dependent algorithms. This replacement allows the steering support to remain reliable through systematic control while achieving optimized turning performance through speed-adaptive angle adjustment.
3Ease of manufacture
If a single steering configuration is used for all speed modes, then the system is simple to manufacture, but the hydrodynamic forces cannot be optimally countered during turns
Solution Approach 1:
The patent implements speed-dependent angle ratio parameters where the saildrive angle is calculated as a percentage of the rudder angle based on the current speed mode. This parameter change approach allows a single steering system to provide optimized hydrodynamic force compensation at different speeds without requiring multiple physical configurations, maintaining manufacturing simplicity while achieving adaptability.
4Stability of the object's composition
If the saildrive lower leg is fixed and cannot be turned, then the structure is simple and stable, but the steering effectiveness is reduced
Solution Approach 1:
The patent makes the previously fixed lower leg dynamic by enabling rotation around the vertical axis. The steerable saildrive can now adjust its orientation based on speed-dependent angle ratios, providing enhanced steering effectiveness while maintaining structural stability through controlled, limited-range rotation rather than fixed positioning.
Data Source
AI summary
A sailboat steering system (1) comprising a steerable saildrive (2), a control lever (3) for controlling a propeller speed of the steerable saildrive (2), a rudder angle sensor (4) to measure the ruder angle (α) of a rudder (5), and an electronic control unit (10). The electronic control unit (10) is enabled to control a steering angle (β) of the steerable saildrive (2), depending on the position of the control lever (3) and depending on a rudder angle (α) of the rudder (5). The invention also relates to a method of steering a sailboat.