Thanks for a very neat confirmation that belt creep in the VPI "Scout" is approximately 1%. When you duplicate the belt you halve the effective compliance so the belt creep also halves.
If it is the case that the pulley is tapered then my observation is moot, the speed differential would be due to the tapering. Etbaby originally reported that his pulley was not tapered.
An interesting experiment would be to try the dual belts on all possible combinations of grooves.
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