The drive is taken into the epicyclic through the planet carrier.
The planet gears have 13 teeth
The rear output anulus has 58 teeth
The front output sun has 32 teeth
So you have a rear output ratio of 13/58, and a front output ratio of 13/32, or 4.46:1 versus 2.46:1
Wont bore you with the maths, but you end up with 0.64reccurring to the rear, and 0.35reccurring to the front.
The viscous coupling connects between the sun and the annulus to PROMOTE equal drive between the two.
_________________
So does that mean that the annulus driving the rear prop, and the sun gear driving the front prop, are rotating at different speeds and the VC tightens up to stop the slip between them to give an equal rpm beween the two outputs providing there is an equal amount of grip at all four tyres when driving in a straight line?????????!!!
Hope that makes sense!!!!!!!!!!!!!!!!