Originally Posted by
buzz66
The Super Puma Family have plenty of design flaws that have never been addressed. Here is the best example, I have plenty more!
Who uses the Epicyclic Ring as part of the structure of the case
Who uses the Planet gears as part of the Bearing
buzz66-
I can't think of any other MRGB that uses the epicyclic stage ring gear as a structural member. But the AH MRGB designs are different in how they use struts to transfer rotor loads to the airframe.
However, almost every MRGB I can think of has the outer race of the epicyclic stage planet gear bearings integral to the gear. Including Bell, Boeing, AW, and EC designs.