Archimedes Spiral

Am new to 3D... very new... there are 2 designs currently which I am trying to play with (http://www.thingiverse.com/thing:775104  and  http://www.thingiverse.com/thing:759232). I am trying to create the blades. Presumably this will be in shape generator - twisted polygon? Maths behind the spiral downloaded from a Youtube video (https://www.youtube.com/watch?v=8sSa8PN604M) but am not able to work out how to place the angles etc within the code. Anyone able to assist?

Many thanks


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