Torque Reaction Fin Propulsion Eliminates Drive-Shaft Friction
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Solution Overview
Problem
Propeller-driven watercraft face inefficiencies due to friction, mechanical complexity, and asymmetric loads in drive-shaft seals, while fin-based systems are impractical due to numerous parts and high manufacturing costs, lacking a cost-effective and efficient propulsion solution.
Innovation Solution
A fin-based propulsion system with a single directly powered component, featuring a torque reaction engine (TRE) that cyclically counter-rotates, generating thrust through oscillating yaw, pitch, or roll, and utilizing a brushless DC motor or internal combustion engine, with a sealed capsule and flexible beam to adjust the angle of attack for efficient thrust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a propeller-driven system is used, then thrust can be generated, but the system suffers from friction losses and mechanical complexity in drive-shaft seals
Solution Approach 1:
The patent removes the drive-shaft and its seals from the system entirely by using a torque reaction engine that generates thrust through counter-rotation of the hull itself, eliminating the source of friction losses and mechanical complexity associated with penetrating seals
Solution Approach 2:
The patent replaces the mechanical drive-shaft transmission system with a torque reaction engine that uses alternating electromagnetic or combustion-driven rotation to directly propel the hull, substituting a complex mechanical transmission with a more efficient direct-action system
2Loss of energy
If a fin-based propulsion system is used, then efficiency can be improved, but the system becomes impractical due to numerous parts and high manufacturing costs
Solution Approach 1:
The patent combines the motor, fuel tank, and structural elements into a single integrated torque reaction engine unit, eliminating the need for separate fin components and reducing manufacturing complexity while maintaining the efficiency benefits of fin-based propulsion
Solution Approach 2:
The torque reaction engine serves multiple functions simultaneously: it provides thrust generation, structural support, and propulsion control, replacing the need for separate specialized components found in traditional fin-based systems
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
The system achieves greater efficiency and reduced complexity compared to propeller-driven craft, with fewer moving parts and no drive-shaft, offering a robust and cost-effective fin-based propulsion method.
Implementation Method 1
The alternating torque reaction between the rotor and inertial mass generates thrust
Implementation Method 2
The rotor and inertial mass are cyclically counter-rotated about a central axis
Implementation Method 3
Oscillation of the fin accelerates thrust fluid and generates propulsive force
Data Source
AI summary
A watercraft comprises a motor, an inertial mass, and a fin. The motor oscillates the inertial mass about an axis, producing a torque reaction on and oscillation of the motor. Oscillation of the motor is communicated to the fin, producing thrust.