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Old 03-24-2016, 04:52 AM   #2
Slides
Rotary Fan in Training
 
Join Date: Apr 2012
Location: NSW, Australia
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You need the gears to constrain its motion or it would just crash the lobes of the rotor into the housing at random. It needs to be phased rotation to allow it to contain the different cycles or "strokes" too.
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