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Re: What material would be best to build a bridge lowering arm?
Certainly a solid. Gases, liquids and plasmas would cause problems.
Cast iron? Seriously? Aside from it being far too heavy, it is not very tough: It breaks easily.
Most teams will be using aluminum. Some will use wood, or perhaps Lexan. None will use Plexiglas (Acrylic) because it is dangerous.
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