V1<V2<V3<V4
W1<W2<W3
W1/W2 = W2/W3 in ideal conditions
If W1/W2 not = W2/W3 (when rotations not synchronized) the loop appears
For supporting the loops there were invented mechanisms, named "loopers"
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From @urirexroth
V1<V2<V3<V4
W1<W2<W3
W1/W2 = W2/W3 in ideal conditions
If W1/W2 not = W2/W3 (when rotations not synchronized) the loop appears
For supporting the loops there were invented mechanisms, named "loopers"