What materials should I use for my mousetrap car? (Already have precise design)

[Incognitum]

I already have a specific design in mind. However, I'm not sure what to use as materials for some of the parts. Not allowed to use kits of any sort.

Components that need material suggestions:

Belt Pulley System -- Two pulleys, one smaller (1-2 inch diameter), and one larger (5-6 inch diameter)

Lever Arm -- Light and strong.

Wheels -- (1-1.5 foot diameter), low rotational inertia.

Also, what type of string is best for attaching to the axle? What size axles are most convenient i.e. ease connecting with other parts, and efficient? What is the strongest mousetrap, or where can I purchase strong helical torsion springs? Attempting to make a vehicle that travels over 250 feet; I need the best possible materials. Any additional relevant information is welcome.

 

[jbsteele]

Belt Pulley System: The pulleys can be made of aluminum or nylon. For the larger pulley, you could also use a timing belt pulley to ensure it runs smoothly. Lever Arm: Aluminum is a good option for a light and strong lever arm. It is also relatively cheap and easy to work with. Wheels: Polyurethane wheels are a good choice for low rotational inertia. They provide good traction and durability. You can purchase them in various sizes (1-1.5 foot diameter).String: Nylon string is the best choice for attaching to the axle. Nylon is strong and flexible, making it ideal for this application.Axles: Steel or aluminum axles are recommended, depending on the type of vehicle you are making. Steel is stronger but heavier, while aluminum is lighter but less durable. You should choose an axle that is compatible with the parts you are using.Strong Mousetrap: You can purchase strong helical torsion springs from your local hardware store or online. These springs are usually made from steel and can be used to create a powerful mousetrap.