Sailboat V-Shaped Flow Profiles with Aerodynamic Ailerons
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Solution Overview
Problem
Sailboats with laterally protruding flow profiles and underwater hydrofoils face instability and reduced maneuverability at higher velocities due to hydrodynamic activity of floats and limited sail pressure, which impairs stability and control behavior.
Innovation Solution
The implementation of V-shaped flow profiles with aerodynamic stabilizers acting as ailerons and underwater hydrofoils with hydrodynamic stabilizers, which generate counter torque to counteract heeling, and a common aileron controller for balanced control behavior, allowing the sailboat to lift out of the water at low velocities and maintain stability at higher speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two flow profiles with floats and downwardly extending wing shafts bearing buoyancy control wings are provided as lateral control wings, then the sailboat can be maneuvered, but in the event of heavier swell or stronger heeling, the floats become hydrodynamically active and negatively influence the hydrodynamic properties and control behavior, impairing stability and maneuverability at higher travel velocities
Solution Approach 1:
The invention extracts the problematic floats from the system by replacing them with rigid flow profiles that have aerodynamic stabilizers. The floats are removed and replaced with streamlined structures that do not become hydrodynamically active in the same way, thus eliminating the negative influence on stability while maintaining maneuverability through the buoyancy control wings on the wing shafts.
Solution Approach 2:
The invention introduces aerodynamic stabilizers on the flow profiles and hydrodynamic stabilizers on the underwater foils that can actively adjust their position and orientation. These dynamic elements allow the sailboat to maintain optimal stability and control behavior across a wide range of velocities and sea conditions, adapting to heavier swell and stronger heeling forces that would otherwise impair performance.
2Speed
If cat-rigged single-handed dinghies are equipped with hydrofoils that lift the boat hull out of the water at low velocity, then travel velocity can be increased, but the sailor must sit on outrigger frames to compensate for sail pressure, resulting in reduced stability and limited sail pressure compensation
Solution Approach 1:
The invention employs underwater foils that generate hydrodynamic lift to counteract the heeling moment created by sail pressure. By positioning the sailor centrally on the boat hull rather than on outrigger frames, the hydrodynamic forces from the underwater foils provide the necessary counterbalancing effect, maintaining stability while enabling higher travel velocities and better sail pressure compensation.
3Speed
If the boat hull lifts out of the water at higher velocities, then drag is reduced and speed increases, but the aligning torque of the sailboat becomes not present, requiring generation of counter torque to maintain stability
Solution Approach 1:
The invention introduces aerodynamic stabilizers on the flow profiles and hydrodynamic stabilizers on the underwater foils as intermediary elements that generate the necessary aligning torque. These stabilizers act as mediators between the lifted boat hull and the aerodynamic/hydrodynamic forces, providing the counter torque needed to maintain stability when the hull is elevated out of the water at higher velocities.
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 stability and maneuverability by counteracting heeling, increasing sail pressure, and enabling higher travel velocities while maintaining balanced control, even in strong winds, by generating lift and downforce through aerodynamic and hydrodynamic means.
Implementation Method 1
an aerodynamic stabilizer forming an aerodynamic aileron... In the case of heeling of the sailboat according to the invention, a lift can be generated on one flow profile and a downforce can be generated on the other flow profile via the aerodynamic aileron, to generate a torque
Implementation Method 2
the at least one underwater hydrofoil is provided with a hydrodynamic stabilizer forming a hydrodynamic aileron... These lift the boat hull out of the water even at low velocity
Data Source
AI summary
A sailboat is described having a boat hull (1), two flow profiles (2, 3) protruding laterally from the boat hull (1), and at least one underwater hydrofoil (16). To be able to achieve high travel velocities while maintaining the stability of the sailboat and balanced control behavior, it is proposed that the flow profiles (2, 3) protrude outward in a V shape from the boat hull and each have an aerodynamic stabilizer forming an aerodynamic aileron (4, 5), and/or the at least one underwater hydrofoil (16) is provided with a hydrodynamic stabilizer forming a hydrodynamic aileron.