I don't think that is it...: I read it reduces electromagnetic permeability, thus reducing friction and allowing higher speeds.
I understand that the stacks are closer together resulting in a more consistent spin because there is less of a gap in between each armature pole. If you look at a straight-stack armature, there is a greater gap between each pole vs. this Auldey armature. I know this from hand winding on these exact armatures and the results I have tested on 1.25v and 6v make me think that spiral armatures do have less "lag" then regular armatures found in radioshack xmod motors. (also in most aftermarket motors made by large part companies)
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