From what I read, they were never even sure of what the centripetal acceleration (G-force) actually was, because of the uncertainty of the measurements. Either way, I suppose you could call this research, but I have always categorized this as a proof of concept of a potential research method.
It should also be noted that NASA has had trouble with tethers in the past, due to vibrations along the wire(s) and orbital mechanics related issues.
It should also be noted that NASA has had trouble with tethers in the past, due to vibrations along the wire(s) and orbital mechanics related issues.