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Toroidal
It was a toroidal disk-type. Two steel disks transferred rotary motion between the concave toroidal disks. We used steel disks, but there was alot of friction loss and efficiency loss, so it wasn't worth it.
But, as a result of this effort, one of our student alumni recently got hired on at GM Powertrain as a CVT co-op engineering student (yeah, Phil!).
Andy B.
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