Shallow Water Boat Tunnel with Plenum for Dual-Depth Operation
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Solution Overview
Problem
Conventional shallow water boats are inefficient for traveling to and from fishing locations in deep water, as they require different characteristics for maneuverability in shallow and deep water environments, leading to increased time and fuel consumption.
Innovation Solution
A shallow water boat design featuring a tunnel that starts at the amidship location with unplugable openings and a plenum connected to a source of air, allowing air to draw into the tunnel at high speeds in deep water for efficient operation, and surface tension to draw water in shallow water, keeping the motor and propeller above the hull.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the boat is designed for shallow water operation with a flat bottom and tunnel, then maneuverability and minimum draft are improved, but efficiency and speed when traveling over open deep water deteriorate
Solution Approach 1:
The patent applies dynamics by making the tunnel configuration changeable based on operating conditions. The tunnel includes an enlarged forward end that can be configured to draw water upward when needed for shallow water operation, and the ability to prevent water entry when operating in deep water, allowing the boat to adapt its hydrodynamic characteristics to different environments.
Solution Approach 2:
The patent changes the operational parameters of the tunnel by controlling water flow through it. In shallow water, the tunnel draws water upward to maintain operation, while in deep water, the enlarged forward end prevents water from entering the tunnel, changing the boat's effective hydrodynamic profile for improved deep water performance.
2Reliability
If the tunnel draws water upward continuously, then shallow water operation is maintained, but fuel consumption and time increase when traveling in deep water
Solution Approach 1:
The tunnel's water drawing capability is made dynamic rather than static. The enlarged forward end allows the tunnel to adapt its water intake based on depth conditions, drawing water when in shallow areas for reliable operation, and preventing water intake when in deep water to reduce energy loss.
3Device complexity
If the motor operates at the same depth in both shallow and deep water, then structural simplicity is maintained, but performance and efficiency deteriorate in both environments
Solution Approach 1:
The tunnel structure serves multiple functions: it acts as a water drawing mechanism for shallow water operation, provides structural support, and functions as a flow control device when operating in deep water. This multi-functionality allows the same structure to optimize performance across different operating environments without requiring separate 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
Enables efficient operation in both shallow and deep water environments, reducing fuel consumption and time for travel to and from fishing locations by ensuring complete separation of water from the tunnel, allowing the motor and propeller to be lowered in deep water and raised in shallow water.
Implementation Method 1
a plenum connects through a series of holes to allow air to be drawn through venturi action into the beginning of the tunnel, which air causes a separation between water moving into the tunnel and the tunnel
Implementation Method 2
when the plenum is not connected to a source of air, surface tension draws water moving across the bottom of the boat up into the tunnel
Data Source
AI summary
A shallow water boat is shown that operates well in both shallow water and deep water. A tunnel is provided along a centerline of a flat bottom, which tunnel starts near amidships increases in depth and terminates at the aft of the shallow water boat. A top of the tunnel has an S curve therein. A front end of the tunnel connects through a series of angled holes into a plenum via a conduit to atmosphere above the maximum water line of the shallow water boat. During shallow water operation, the motor is raised and the conduit is plugged so water flows through the tunnel to the propeller for the motor. During deep water operation, the motor is lowered and the conduit unplugged so that water does not flow through the tunnel.