Trolling Motor Propeller Shield with Vertical Fin and Arcuate Guard
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Solution Overview
Problem
Trolling motors face challenges in maneuverability, stability, and operability in shallow water due to limitations in existing designs, particularly in handling water currents and waves, and require improvements for enhanced usability and installation ease.
Innovation Solution
A propeller shield apparatus with a vertical fin and arcuate propeller shield, mounted to a trolling motor using a semi-cylindrical bracket with adjustable band clamps, which includes angular fins to enhance steering and reduce air ingestion, constructed from durable materials like aluminum or stainless steel, providing improved stability and maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional trolling motor design is used, then the motor is simple and easy to manufacture, but it lacks steering control and stability in water currents
Solution Approach 1:
The shield assembly is divided into separate components: a vertical fin portion for steering control, an arcuate propeller shield portion for protecting the propeller and reducing air ingestion, and a mounting bracket for attachment. This segmentation allows each component to perform its specific function while maintaining overall simplicity and ease of manufacture.
Solution Approach 2:
The shield assembly serves multiple functions simultaneously: the vertical fin provides steering control and stability, the arcuate shield protects the propeller from air ingestion and water damage, and the mounting bracket enables universal attachment to various trolling motor types. This multi-functionality improves ease of operation without requiring multiple separate devices.
2Reliability
If the propeller is exposed to air and water currents, then the motor operates freely, but air is ingested into the motor and stability is reduced
Solution Approach 1:
The arcuate propeller shield portion extracts and blocks air from entering the propeller area, creating a protective barrier that prevents air ingestion while allowing the propeller to operate freely in water. This extraction of harmful air flow enables reliable motor operation in shallow water without compromising propeller performance.
Solution Approach 2:
The arcuate propeller shield acts as an intermediary barrier between the propeller and the air/water interface. It mediates the interaction by blocking air ingestion while allowing water flow to reach the propeller, thus protecting the motor from air damage while maintaining operational reliability in shallow water conditions.
3Reliability
If a custom-fitted mounting bracket is used, then the shield attaches securely to the specific motor, but installation becomes complex and not universally compatible
Solution Approach 1:
The mounting bracket is designed with universal compatibility to attach securely to various trolling motor types and configurations. It provides standardized attachment points that work across different motor models, enabling secure mounting without requiring custom fabrication or complex installation procedures for each specific motor type.
Solution Approach 2:
The mounting bracket is designed as a separate, standardized component that can be independently manufactured and attached to the shield assembly. This segmentation allows the mounting bracket to be optimized for universal compatibility while maintaining secure attachment, simplifying both manufacturing and installation processes.
4Object-affected harmful factors
If the shield is positioned close to the propeller, then protection is maximized, but the propeller performance is compromised
Solution Approach 1:
The arcuate propeller shield is positioned and shaped to provide localized protection specifically at the propeller's critical areas where air ingestion occurs. The shield's curvature and positioning are optimized to block air flow to the propeller while maintaining adequate clearance to preserve propeller thrust efficiency and overall productivity.
Data Source
AI summary
A propeller shield apparatus for mounting to a trolling motor having an exposed propeller with a horizontal axis includes a vertical fin and an arcuate propeller shield. The arcuate propeller shield is oriented concave downward and fixed to the vertical fin. The vertical fin is carried by the trolling motor. The vertical fin spaces the propeller shield above the propeller. A curved bracket is provided, connected to the vertical fin, and is clamped to the trolling motor. Angular fins can be provided at opposite ends of the propeller shield which extend substantially radially from the horizontal axis.