Arrow Shaft Carbon Fiber Nock Insert for Energy Retention
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Solution Overview
Problem
Existing arrow shafts lack a reinforced nock end design that enhances travel distance, as they do not incorporate a carbon tube insert for harmonic cancellation and energy retention.
Innovation Solution
An arrow shaft with a reinforced nock end featuring a carbon fiber tube insert, where the tube is at least 1.5 inches long but no longer than 45% of the shaft's length, secured to the inside perimeter with a bonding substance, either flush or inserted to accommodate an arrow nock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a carbon fiber tube insert is added to the nock end of the arrow shaft, then energy retention and travel distance are improved, but device complexity increases
Solution Approach 1:
The carbon fiber tube insert is nested within the nock end of the arrow shaft, with the tube having an outer diameter that fits within the nock end inner diameter. This nesting approach allows the energy-retaining carbon fiber tube to be integrated into the existing arrow shaft structure without requiring complete redesign, thus improving energy retention while minimizing the increase in device complexity.
2Loss of energy
If the carbon fiber tube length is increased to improve harmonic cancellation, then energy retention improves, but the tube may interfere with arrow nock clearance
Solution Approach 1:
The length of the carbon fiber tube insert is controlled within a specific range (at least 1.5 inches but no longer than 45% of the arrow shaft length). This parameter control ensures sufficient length for harmonic cancellation and energy retention while maintaining clearance for the arrow nock. The bonding substance embedment further fine-tunes the effective length to optimize both energy retention and nock clearance.
3Strength
If the carbon fiber tube is secured with bonding substance, then structural integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The bonding substance is applied locally at the nock end of the arrow shaft to secure the carbon fiber tube insert. This localized bonding approach provides sufficient structural integrity to hold the insert in place without requiring complex manufacturing processes. The bonding substance is embedded in the nock end, creating a strong local connection that maintains structural integrity while keeping the overall manufacturing process relatively simple.
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 carbon fiber tube insert helps retain energy, resulting in a greater travel distance compared to conventional arrow shafts by mitigating oscillations during flight.
Implementation Method 1
The carbon fiber tube provides harmonic cancellation to oscillation in the arrow shaft during flight
Data Source
AI summary
An arrow shaft having a reinforced nock end includes an arrow shaft and a carbon fiber tube retained in a nock end of the arrow shaft. An end of the carbon fiber tube may be flush with the nock end of the arrow shaft or be inserted to a depth to provide clearance for a shaft of an arrow nock. The carbon fiber tube is secured to an inside perimeter of the arrow shaft with any suitable bonding substance. A length of the carbon fiber tube is at least 1.5 inches long, but no longer than 45% of a length of an arrow shaft.