Plywood.
The fiberglass material where its soft and light but sturdy fro rips
A roof dome is a cheap and effective way of bringing natural light into any type of building.
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No, brick is not translucent. It is a solid building material that does not allow light to pass through it.
· light fixtures · lightning rods · linoleum · locks · lumber
· light fixtures · lightning rods · linoleum · locks · lumber
· light fixtures · lightning rods · linoleum · locks · lumber
Pumice stone mixed with concrete.
Steel, light weight, stainless, sturdy, it will not rust and the lead to civilians dropping onto the tracks, or worse into the path of a train.
It's light enough, cheap enough, strong enough and easy enough to work with.
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There are several materials you can use. Plastic assignment folders make an excellent fin because they are light weight and more durable than paper. Corriflute (Correx) is also a great material as it to is sturdy. (i am assuming you are building a 2 liter water bottle rocket) Avoid using paper and card board as the water can damage the fins making them anti-productive.