Scott Speirer wrote:

In figure 3.23, I think the subscripts "F" and "R" mean which end of the engine.  Is "F"
front and "R" rear?  Couldn't mean that.

Scott

Perhaps but it does not really matter. These balance weights are to remove
the couple in a two rotor and above engines. If the radial distance of the masses 
from the e-shaft center line and the axial distances from the center of the 
engine were all the same the masses would then all be the same. 

The problem arises because the axial and radial distances of the balance masses varies
in most engine designs. At the power take off end it is convenient to incorporate 
the balance mass at the rim of a large diameter flywheel. At the front of the engine
it is convenient to move the mass axially away from the center of the engine and use
a larger mass with a smaller radius.

Paul Lamar
 
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