Originally Posted by
WHBM
C'mon guys, it's a straightforward Epicyclic sun & planet gear train, been used for all sorts of uses for about 100 years or more. For Pratt & Whitney, the good old PT6 turboprop, like most turboprops, had its reduction gearing using the same concept, though that had three intermediate carrier gears instead of five.
except it's sun and stars. They are fixed.