Hydroski Steering via Roll Angle Control
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Solution Overview
Problem
Hydroski-borne watercraft face challenges in directional control at high speeds without conventional thrust vectoring and rudders, leading to increased hydrodynamic drag and reduced efficiency.
Innovation Solution
Directional control is achieved by adjusting the roll angle of individual hydroskis about their longitudinal axes, generating side forces that enable steering without submerged steering mechanisms, using electric motors, hydraulic, or pneumatic actuators to coordinate the rolling motion of the hydroskis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional thrust vectoring and rudders are used for directional control, then steering capability is improved, but hydrodynamic drag increases and fuel economy deteriorates
Solution Approach 1:
The patent removes conventional submerged steering mechanisms (rudders and thrust vectoring systems) from the watercraft design. By extracting these drag-generating components entirely and replacing them with a surface-based hydroski steering system, the invention eliminates the source of hydrodynamic drag while maintaining steering capability through roll angle control of the hydroskis.
Solution Approach 2:
The invention replaces the traditional mechanical submerged rudder system with a hydrodynamic surface-based system using hydroskis. Instead of using submerged surfaces to generate steering forces, the system uses the roll motion of surface-skimming hydroskis to generate side forces through hydrodynamic pressure differences, substituting a more efficient mechanical-hydrodynamic approach.
2Ease of operation
If conventional submerged steering mechanisms are used, then directional control is achieved, but hydrodynamic friction and drag increase
Solution Approach 1:
The patent extracts and removes all submerged steering mechanisms from the system. By taking out the rudders and submerged thrust vectoring components that generate hydrodynamic drag, the invention leaves only the essential propulsion and surface-skimming hydroskis, thereby eliminating the harmful drag effect while maintaining directional control through alternative means.
Solution Approach 2:
The invention transitions steering control from the traditional submerged three-dimensional flow field to a surface-based two-dimensional hydrodynamic interaction. By moving the steering mechanism from underwater to surface level and using roll angle control, the system exploits surface wave dynamics and atmospheric interaction, representing a dimensional shift from submerged to surface operation.
3Power
If submerged thrust mechanisms are used, then propulsion is achieved, but fuel consumption increases due to increased drag
Solution Approach 1:
The patent removes submerged thrust mechanisms from the watercraft design and replaces them with surface-based propulsion systems. By extracting the drag-generating submerged components and using surface-skimming hydroskis with shallow entry angles, the invention reduces hydrodynamic resistance and consequently decreases the energy required for propulsion.
Solution Approach 2:
The invention changes key operational parameters including the entry angle of the hydroskis (maintaining shallow angles of attack) and the operational draft (reducing submerged depth). These parameter changes optimize the balance between lift generation and drag reduction, enabling efficient propulsion with lower fuel consumption while maintaining adequate thrust capability.
4Loss of energy
If shallow entry angles and shallow operational drafts are used, then fuel economy is improved, but steering control becomes more difficult
Solution Approach 1:
The patent introduces dynamic control through active adjustment of hydroski roll angles. Instead of relying on fixed geometric configurations, the system uses actuators to dynamically vary the roll angles of individual hydroskis in real-time, enabling precise steering control despite the shallow entry angles and reduced submerged depth that improve fuel economy.
Solution Approach 2:
The invention implements a feedback control system that monitors the watercraft's heading and position, then adjusts the roll angles of the hydroskis accordingly. This closed-loop control compensates for the reduced steering authority inherent in shallow draft configurations, maintaining ease of operation while preserving the fuel economy benefits of the shallow entry angle design.
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 approach reduces hydrodynamic drag, decreases fuel consumption, and improves fuel economy by eliminating the need for conventional steering mechanisms, while maintaining maneuverability and ride quality even in high seas.
Implementation Method 1
In high speed conditions, hydroski-borne watercraft must generate enough hydrodynamic lift from a plurality of hydroskis to lift the displacement hull out of the water
Implementation Method 2
Other drivers such as hydraulic and/or pneumatic motors and/or cylinders can also be effectively employed to provide a pivoting, banking or rolling motion to one or more hydroskis
Implementation Method 3
Other drivers such as hydraulic and/or pneumatic motors and/or cylinders can also be effectively employed to provide a pivoting, banking or rolling motion to one or more hydroskis
Implementation Method 4
The side force on an individual hydroski is proportional to the sine of the roll angle of the hydroski with respect to the surface of the water and the lift force is proportional to the cosine of the roll angle of the hydroski with respect to the surface of the water
Data Source
AI summary
A steering system for hydroski-borne watercraft eliminates the need for conventional steering mechanisms such as rudders or thrust vectoring from propulsion units. Complete steering and navigable control is achieved by rolling or otherwise banking individual hydroskis thereby creating a side force on each hydroski. This force is proportional to the sine of the bank angle or roll angle. The sum of the forces and moments from the individual hydroskis are of sufficient magnitude and can be appropriately balanced to effect coordinated watercraft steering and navigable control.