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I recently built a six turn 32" radius helix from two sheets of 1/2 ply with material left over. The RMC method does not actually save material, rather it saves time and easy to construct because one doesn't have to make curved cuts. The drawback is that there are eight instead of four pieces to put together for each circle. The pieces for a tradional quarter turn helix are easy to lay out on the plywood using a trammel. (stick or string from the fulcrum point). Helixes are a pain to build, but not as hard as everyone makes them out to be....
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