Fred Osborn wrote:

Paul,

I believe the attached balance diagram is in error because it
does not account for the single rotor e-shaft unbalance. A
multi-rotor e-shaft can be balanced by the opposing masses
and eccentricities of its rotor journals. The single rotor e-shaft
cannot so its unbalance should be added to that of the rotor
mass and eccentricity. Do you agree?

Fred Osborn

Yes I think you are right. It clearly states that M is the rotor mass alone
and not the mass of the rotor and the mass of the offset part of the e-shaft.

Right out of Kenichi Yamamota's book Rotary Engine.  

I checked the latest edition and it is corrected in the text. "M: mass of 
the rotor (including seals and cooling oil) and eccentric mass of the rotor journal."

Paul Lamar
 
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