Tracy Crook wrote:

If I understand correctly, the only reason that overbalancing helps in a
recip is because you cannot truly counter balance a reciprocating mass with
a rotating counterweight.  You probably already know this.  The rotary CAN
be 100% in balance because all the masses are rotating in a circle.  Never
mind the shape outlined by the apex seals, the center of mass of the rotors
rotates in a perfect circle.   So,  the ideal counterbalancing of a rotary
is 100 % in balance and not a gram more.  The only trick is to correctly
calculate (or guess) the amount of trapped oil in the rotors.  I'm sure this
varies with RPM.

Tracy Crook   rws@altavista.net

 
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