Towing Flotation Device with Segmented Buoyancy and Tapered Drag Reduction
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Solution Overview
Problem
Existing flotation devices are not capable of transporting larger and heavier items, such as hiking rucksacks, due to material constraints, resulting in increased weight and volume that makes them difficult to transport and use effectively.
Innovation Solution
A modular kit with a flotation device that minimizes material usage by distributing the mass of a dry bag and its contents, allowing for reduced air requirements and a tapered design to reduce water resistance, along with adjustable straps and a non-inflatable support means to secure the dry bag, enabling the transportation of items up to 14 kg and 80 liters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large compartment is used to accommodate hiking rucksack, then the capacity to transport larger items is improved, but the weight and volume of the flotation device increases
Solution Approach 1:
The flotation device is divided into multiple separate inflatable compartments instead of one large compartment. This segmentation allows the device to provide sufficient total buoyancy volume while using less material, reducing both weight and packed volume for portability.
Solution Approach 2:
The dry bag containing items is positioned within the U-shaped space formed by the inflatable compartments, effectively nesting the storage container within the flotation structure. This allows the system to transport large volumes of items without proportionally increasing the flotation device's material requirements.
2Quantity of substance
If a large compartment is used to accommodate hiking rucksack, then the capacity to transport larger items is improved, but the volume of the flotation device increases
Solution Approach 1:
The flotation device is divided into multiple separate inflatable compartments instead of one large compartment. This segmentation allows the device to provide sufficient total buoyancy volume while using less material, reducing both weight and packed volume for portability.
3Quantity of substance
If more material is used to create larger inflated volume, then the flotation capacity is improved, but the portability of the device deteriorates
Solution Approach 1:
The flotation device is divided into multiple separate inflatable compartments instead of one large compartment. This segmentation allows the device to provide sufficient total buoyancy volume while using less material, reducing both weight and packed volume for portability.
Solution Approach 2:
The inflatable compartments can be inflated to the required volume when needed and deflated for compact storage and transport. This dynamic capability allows the device to provide large flotation volume during use while maintaining portability during transport.
4Ease of operation
If the dry bag is positioned with closure at the rear, then the mass distribution is different, but the lead end gets dragged under water increasing resistance
Solution Approach 1:
The flotation device has asymmetric design with the lead portion providing greater inflated volume than the rear portion. This asymmetric volume distribution creates a tilt that positions the lead end higher in water, preventing it from being dragged underwater and reducing resistance during towing.
Solution Approach 2:
The dry bag closure is positioned over the lead portion before towing begins. This preliminary positioning of mass ensures the correct tilt is established in advance, preventing the lead end from being dragged underwater during the towing operation.
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 kit allows for the efficient and portable transportation of larger items, maintaining stability and reducing water resistance, with a total mass of less than 1.2 kg and a volume of over 70 liters, suitable for multi-day expeditions.
Implementation Method 1
The lead portion (10a) and the first and second side portions (10b, 10c) provide a U-shaped space (38) receiving a flexible dry bag (30). The spaced inflated side portions provide support for the dry bag without significant need for material between them.
Implementation Method 2
The flotation device preferably tapers rearwardly from the lead portion at a periphery thereof, for reduced resistance to towing.
Data Source
Figure 1
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AI summary
A kit is for towing through water by a swimmer to transport items, which comprises: an inflatable flotation device and a dry bag (32). The flotation device comprises, when inflated, a lead portion (10a), two spaced side portions (10b, 10c) each extending rearwardly from the lead portion, and attachment means. The dry bag (32), which may be separate to the flotation device, has an openable, water-tight closure. The side portions, when the device is inflated, and the dry bag are respectively shaped to cooperate so that the side portions provide support for the dry bag. The flotation device including the attachment means is arranged to attach the dry bag to the flotation device such that the closure (34) is located above a lead portion of the flotation device. The kit is attachable to a tow leash (32) such that a swimmer can tow the flotation device with the dry bag attached in water and such that the lead portion leads through the water.