X-Mozilla-Keys:                                                                                 

Don Sherman wrote:

This is neither a trick question nor a Wankel question:  why do virtually all
rotaries [radials] (piston type) have an odd number of cylinders in each bank? 
(Yes, I
know about the master/slave connecting rod designs within.)  Air & Space asked
me this poser a couple of years ago and I have not yet found a credible
answer.  DS

 
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