www.selmec.org.uk/article_0005_a_clutch_of_differentials.aspx

Very cool! Some serious thinking going on there.

that came more than close to melting my brain

What a set of complicated gears. I'd need to see them working to understand how they work.

I'm reminded of when I was a callow and beardless youth, I'd had the workings of a normal differential explained to me and I'd not understood how it works.
One day in a spare parts store there was a cut away differential on the counter with a winding handle attached to it. A few minutes of playing with it and the light dawned.

Those models would be the same for me to understand how they work.

I can relate to that - nothing like a practical example of 'how it works'.

A while back I looked at a Torsen diff. unit and could not make out how it worked. Having left school aged 15, and no real engineering background, it was hard for me to understand the Torsen's workings. Then I figured it was a bit like a chain block - when the pressure is released, the load 'locks up' the chain wheel, preventing the load from dropping. Am I on the right track? Someone please tell me (in simple terms) how it works!

Cheers, Greg