Archie Frangoudis wrote:

Thank you Jeff, But all you mentioned I am familiar with.
Have been balancing engines from fractionals to 5000hp.
for a number of years.
In many engines where there is not enough room internally
for counterweights, we eliminate the external weights and
with the use of tungsten, move this counterbalance physically
inside. The rotors should be balanced due to the fact that they
are rotating as they revolve, and they should equal each
other. Many performance shops balance to .5gr statically.
I am more demanding and maintain .1gr.
I have not calculated the oil passage weight yet.
In piston engines that run above 8KRPM, there is a slight
advantage in overbalancing, hence my question regarding
the rotary. Any additional info would be appreciated. When
I get into this, I don't like coming in second.
Archie

 
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