Double-Walled Arrow Shaft Reducing Flight Oscillation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Arrow shafts experience physical oscillation due to flexing or bending, which reduces the distance traveled and affects accuracy at longer distances.
Innovation Solution
A double-walled arrow shaft design featuring an inner and outer shaft tube made from different carbon fiber materials, where the inner tube has a higher tensile modulus and reduced oscillation, restricting the oscillation of the outer tube to minimize overall shaft oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a single-walled arrow shaft is used, then the structure is simple and easy to manufacture, but the arrow shaft experiences significant physical oscillation during flight
Solution Approach 1:
The patent applies nesting by placing an inner shaft tube inside the outer shaft tube, creating a concentric double-walled structure. The inner tube is positioned within the outer tube's internal diameter, forming a nested configuration that reduces oscillation while maintaining structural integrity. This nested arrangement allows the inner tube to constrain the outer tube's oscillation movements.
Solution Approach 2:
The patent employs composite materials by combining two different carbon fiber materials with distinct oscillation characteristics. The inner shaft tube is made from a carbon fiber material with lower oscillation magnitude, while the outer shaft tube uses a different carbon fiber material. This composite construction enables the inner tube to restrict the outer tube's oscillation, significantly reducing overall shaft oscillation during flight.
2Stability of the object's composition
If the inner shaft tube has a higher tensile modulus, then oscillation is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by selecting carbon fiber materials with specific tensile modulus values. The inner shaft tube uses a carbon fiber material with a higher tensile modulus (greater than 1,000,000 psi) compared to the outer tube's material. This parameter differentiation allows the inner tube to provide oscillation restriction while maintaining manufacturability through standard precision tolerances for tubular components.
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
Significantly reduces physical oscillation, enhancing the arrow's travel distance and aiming accuracy by utilizing the contrasting oscillation characteristics of the concentric tubes.
Implementation Method 1
The inner shaft tube has a tensile modulus, which is greater than the tensile modulus of the outer shaft tube. A magnitude of oscillation of the inner shaft tube is less than a magnitude of oscillation of the outer shaft tube. The oscillation of the inner shaft tube will restrict the oscillation of the outer shaft tube
Data Source
AI summary
An arrow shaft with a double wall, which decreases physical oscillation during the initial travel of the arrow. The arrow shaft with a double wall preferably includes an inner shaft tube and an outer shaft tube. The outer shaft tube has a normal length of an arrow shaft. The inner shaft tube has a tensile modulus, which is greater than the tensile modulus of the outer shaft tube. The oscillation of the inner shaft tube will restrict the oscillation of the outer shaft tube and thus reduce oscillation of the arrow shaft with a double wall. An arrow insert includes a tubular shaft and a shoulder. An outer diameter of the tubular shaft is sized to be received by an inner diameter of the inner shaft tube. A second embodiment of the arrow shaft with a double wall includes a dual step arrow insert.