George G,
Very interesting, you have put a lot of thought into this.  Does anyone
know if the e-shafts are heat treated at the factory?  Would an older,
and heavier, e-shaft for the engine section next to the PSRU be slightly stronger?
Concerning the PSRU, look at the dampning to see if a more rugged
connection is needed.  Then, will the alum housing take all that
torque? A possible alternative would be to use an Allison trans
gearset as they are straight cut to handle even more torque of a
big diesel and maybe a double wall welded, steel rings and
sheetmetal, housing.

I remember Steve Beckman discussing their PSRU and how they made
everything stiffer to eliminate the need for dampning.  An
engineering analysis showed the improvements eliminated harmonic
problems.  Don't know if this solution would work with a planetary gearset.
Dan F


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