Katerina Swanson
Carbon fibre fuel tanks are an alternative to metal tanks. They are safe, but it is important to note that carbon fibre is conductive and can be dangerous if it comes into contact with battery leads. Carbon fibre tanks are also susceptible to leaks at the seams and are not suitable for racing in most countries. The process of making a carbon fibre fuel tank involves creating a mould, which can be done by making a polystyrene form of the fuel tank and then laminating carbon fibre over it. The polystyrene inner form can then be melted away with acetone. This process is known as vacuum moulding. The cost of materials for creating a carbon fibre fuel tank is estimated to be around $500, with an additional $100-$200 for equipment.
| Characteristics | Values |
|---|---|
| Materials | Carbon fibre, fibreglass, kevlar, steel, aluminium, PEX, HDPE, epoxy resin, polystyrene, acetone, glass |
| Cost | $500 for materials, $100-$200 for equipment, $7000 for a custom tank |
| Process | Vacuum bagging, moulding, sealing, lamination, welding, coating, melting |
| Concerns | Leaking, delamination, conductivity, visibility of fuel level, crash resistance, punctures, joints |
| Alternatives | Metal, plastic, bladders |
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What You'll Learn
- Carbon fibre fuel tanks can be made using a polystyrene form, laminated with carbon fibre
- Carbon fibre is conductive, so keep it away from battery leads
- Carbon fibre tanks can cost around $500 in material costs and $100-$200 for equipment
- Carbon fibre tanks are not see-through, unlike Kevlar, which is semi-transparent
- Carbon fibre is strong, but Kevlar is more impact-resistant
Carbon fibre fuel tanks can be made using a polystyrene form, laminated with carbon fibre
Firstly, a polystyrene form of the fuel tank is made. This can be done by using a plug made of foam, which is then coated in water-soluble PVA and layered with glass cloth to the desired thickness. Alternatively, one can use a male plug and then make a three-part mould.
The polystyrene form is then laminated with carbon fibre. This can be done through vacuum moulding. One user on a forum noted that they tested a double layer of carbon fibre and it would not hold liquid. Another user commented that they had successfully made a fuel tank with two layers of carbon fibre and 6 or 9 ounces of glass.
After the carbon fibre has been applied, the polystyrene inner form is melted with acetone. This process requires a fair amount of acetone and patience.
It is important to note that carbon fibre is conductive and so users must be careful to keep it at a safe distance from battery leads. Additionally, carbon fibre tanks have a tendency to leak at the seams and can be more prone to damage in crashes.
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Carbon fibre is conductive, so keep it away from battery leads
Carbon fibre is a conductive material, and as such, it can short out unprotected components. This is a significant concern when working with battery leads, as any contact between the carbon fibre and the battery leads could result in a short circuit.
To prevent this, it is crucial to take several precautions when working with carbon fibre and battery leads. Firstly, ensure that the carbon fibre surfaces are properly insulated. This can be done by applying electrical tape or heat shrink tubing to the carbon fibre surfaces that may come into contact with the battery leads. Additionally, it is important to be cautious when working with sharp edges on carbon fibre, as they can easily penetrate wire insulation and cause a short circuit.
Another important consideration is the use of an insulation monitoring system. This system can measure the insulation resistance between the main ground and the high-voltage system, helping to ensure that the carbon fibre fuel tank is properly insulated and does not pose a safety hazard.
Furthermore, it is recommended to keep the battery leads as far away from the carbon fibre fuel tank as possible. This will help to reduce the risk of accidental contact and minimize the chances of a short circuit occurring. Regular inspection and maintenance of the fuel tank and battery leads are also crucial to identify and address any potential issues promptly.
By following these precautions and maintaining a high level of awareness of the conductive nature of carbon fibre, you can help ensure the safe operation of your carbon fibre fuel tank and prevent electrical short circuits.
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Carbon fibre tanks can cost around $500 in material costs and $100-$200 for equipment
Carbon fibre fuel tanks are often used in the aerospace sector, for rockets and aircraft, and in the energy sector, for storing compressed natural gas (CNG) and hydrogen. They are also used in marine applications, high-performance sports cars, and scuba diving equipment.
The cost of making a carbon fibre tank can vary depending on various factors, such as the type of carbon fibre tank, the complexity of the manufacturing process, and the equipment used.
Let's break down the costs mentioned in the prompt:
Material Costs ($500):
The choice of materials for a carbon fibre tank can vary depending on its intended use. For example, Type III carbon fibre tanks have an aluminium core with a carbon fibre composite wrap and a plastic liner, while Type IV tanks have a full carbon fibre composite shell with a plastic composite liner. The cost of the materials will depend on the type and quantity required for your specific project.
Equipment Costs ($100-$200):
Creating a carbon fibre tank requires specialised equipment for tasks such as moulding, shaping, and laminating. This can include items like moulds, ventilation equipment, safety gear (such as Tyvek suits and breathing masks), and tools for carbon fibre lamination.
It's important to note that the costs provided in the prompt may be a rough estimate or specific to a particular project. The total expense of creating a carbon fibre tank can vary depending on the scale of production, the complexity of the design, and the availability of resources.
Additionally, as mentioned in the sources, carbon fibre fuel tanks have certain disadvantages, such as a tendency to leak at the seams and conductivity, which can pose safety hazards if not carefully addressed.
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$214.95
Carbon fibre tanks are not see-through, unlike Kevlar, which is semi-transparent
Carbon fibre is a weave of fibres composed mostly of carbon atoms. The carbon atoms are bonded together in crystals that are aligned parallel to the fibre's long axis. This alignment gives the fibre a high strength-to-volume ratio, making it strong for its size. To make something with carbon fibre, layers of carbon weave are overlapped according to a pre-determined orientation to give optimal strength and stiffness, depending on the purpose of the product.
Due to its manufacturing process and the composition of carbon fibres, carbon fibre is not see-through.
On the other hand, Kevlar is a material that is relatively semi-transparent. Kevlar is used in radomes, which are structures that protect antennas. Its semi-transparent property is advantageous for this application.
Therefore, while carbon fibre tanks offer advantages such as high stiffness, strength, and temperature tolerance, they are not see-through. In contrast, Kevlar provides the benefit of being semi-transparent, allowing for its use in specific applications like radomes.
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Carbon fibre is strong, but Kevlar is more impact-resistant
Carbon fibre is a strong material with one of the highest strength-to-weight ratios in existence, even higher than steel and titanium. It is composed of thin strands of carbon woven together and then combined with a resin to form a composite material. This makes carbon fibre ideal for aerospace and automotive structural parts where rigidity is crucial.
However, carbon fibre's brittleness can make it susceptible to cracking under severe impact or stress. This is where Kevlar, another synthetic fibre with high tensile strength, comes into play. Kevlar is known for its impact resistance, flexibility, and durability. It can stretch significantly without breaking under tension, making it ideal for protective gear and ballistic protection. Kevlar's high heat resistance also makes it suitable for applications involving high temperatures, such as firefighter suits or construction helmets.
When deciding between carbon fibre and Kevlar for a fuel tank, it is essential to consider the specific requirements. Carbon fibre's rigidity and strength make it ideal for structural components, while Kevlar's impact resistance and flexibility provide advantages in applications where energy absorption and durability are crucial. Additionally, the feasibility of using fiberglass or other materials for the fuel tank should be evaluated, as well as the complexity and permanence of the process.
In conclusion, while carbon fibre possesses impressive strength and rigidity, Kevlar stands out for its superior impact resistance and flexibility. This makes Kevlar a preferred choice for applications where impact absorption, durability, and lightweight design are critical factors, such as protective gear and fuel tanks.
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Frequently asked questions
You will need carbon fibre, a mould, resin, and epoxy.
First, make a polystyrene or foam mould of the fuel tank. Then, laminate carbon fibre over the mould using epoxy. Finally, melt the polystyrene inner form with acetone.
The materials cost around $500, and the equipment costs an additional $100-$200.
Carbon fibre is conductive, so it can be dangerous if it comes into contact with battery leads. Carbon fibre tanks also tend to leak at the seams and can be deadly in crashes.
