Originally Posted by
jimf671
TS,
Power is Torque times Speed. At high speeds, in stages near the engine, lower torque is experienced so single stage reductions and smaller gear sets are adequate. As you get nearer rotor speed, torques become very large, epicyclics make more sense as way of spreading load across many components, and facewidth typically increases as torque increases.
Radial load from the rotor mast is transferred through the upper planet carrier
and onto the planetary gear. So to even transfer the load on to the gears there is a flex in the system.
I am sure that the higher loading distributed through the gears are accounted for in the design, and thus the gear tooth width.
The gears does not only handle the input torque as you suggest.
My point is that this allowable flex in the system. While probably increasing the individual gear life, is a great risk that the rotor will detach from AC if the gearbox breakdown.
the explanation confirms my previous point why not having 10 suspension bars and ultimately prevent the rotor share-off if the gearbox breaks down.
It could as well be a coincidence and the reason for only having
3 susp bars is only to save money and they thought it would be enough.