Multi-layer Bladder Construct for Kite Leading Edge
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Solution Overview
Problem
Existing kite bladders for kiteboarding are heavy and prone to herniation, pinhole leaks, and rupture due to inadequate tensile strength and expansion capabilities, which affects performance and safety, especially during re-launching from water and flying in light winds.
Innovation Solution
A multi-layer bladder construct featuring a non-stretchable outer covering made from woven polymer fibers and a stretchable inner bladder with a bi-axially oriented polymer film, incorporating a stretchable flexible film for enhanced expansion, attachment, and sealing capabilities, which shares tensile force loading and reduces the risk of herniation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer elastomeric bladder is used in the kite leading edge tube, then the bladder can be simple in structure and easy to manufacture, but the bladder becomes heavy and prone to herniation, pinhole leaks, and rupture due to inadequate tensile strength and expansion capabilities
Solution Approach 1:
The bladder is divided into multiple functional layers: an inner bladder layer for containment and an outer covering layer for structural support. This segmentation allows each layer to specialize in specific functions, with the inner layer handling expansion and the outer layer providing tensile strength, thereby improving reliability without excessive complexity.
Solution Approach 2:
The bladder construct uses composite material architecture combining different polymer layers with distinct properties. The inner bladder uses elastomeric material for flexibility and expansion, while the outer covering uses high-tensile-strength material for structural integrity. This composite approach resolves the contradiction by integrating materials that individually address different requirements.
2Strength
If the bladder material has high tensile strength to prevent rupture, then the bladder integrity improves, but the weight of the bladder increases which affects kite performance and ease of re-launch
Solution Approach 1:
The bladder system segments the weight-bearing function from the containment function. The outer covering layer assumes the primary tensile load-bearing role with high strength-to-weight ratio materials, while the inner bladder layer provides containment with minimal weight. This functional segmentation achieves high tensile strength without proportionally increasing overall bladder weight.
Solution Approach 2:
The design employs thin-film technology for the inner bladder layer, using bi-axially oriented polymer films that provide adequate containment with minimal weight. The thin film approach reduces weight while the outer covering compensates for tensile strength requirements, resolving the strength-weight contradiction.
3Ease of manufacture
If the inner bladder outer surface area is made equal to the outer covering inner surface area, then the bladder can be simpler to manufacture, but the bladder cannot effectively share tensile force loading and is more prone to herniation
Solution Approach 1:
The design implements local quality by creating an undersized inner bladder that leaves specific regions of the outer covering exposed. This intentional non-uniformity allows the outer covering to locally bear tensile loads in critical areas while the inner bladder handles containment, optimizing both strength and manufacturing feasibility through localized functional zones.
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 multi-layer bladder construct reduces the weight and improves the integrity of the kite, enhancing its aerodynamic shape, ease of re-launch, and responsiveness by distributing tensile forces effectively, while minimizing the risk of rupture and herniation.
Implementation Method 1
The inner bladder is made from a bi-axially oriented polymer film. Upon inflation, the inner bladder stretches and expands until the outer surface of the inner bladder engages the inner surface of the outer covering, whereby a portion of the tensile force loading on the outer covering is shared with the inner bladder.
Implementation Method 2
A stretchable flexible film is incorporated into the inner bladder in at least one selected location. The stretchable flexible film has an elastic expansion range which is greater that the elastic expansion range of the remainder of the inner bladder.
Data Source
AI summary
A multi-layer bladder construct consisting of a non-stretchable outer covering and a stretchable inner bladder. The outer covering has an inner surface and is made from woven polymer fibers having a warp direction and a weft direction. The inner bladder is made from a bi-axially oriented polymer film. The inner bladder has an outer surface area that is smaller than the inner surface area of the outer covering. Upon inflation, the inner bladder stretches and expands until the outer surface of the inner bladder engages the inner surface of the outer covering, whereby a portion of tensile force loading on the outer covering is shared with the inner bladder. A stretchable flexible film is incorporated into the inner bladder in at least one selected location. The stretchable flexible film has an elastic expansion range which is greater that the elastic expansion range of the remainder of the inner bladder.