This is an older video of a tether car doing 200+ MPH on a circular track. At first I thought the guy in the video was participating in a bat-spin race, but then I realized he was whipping the car around to get it started. Watch the video till the end to see the thing really get up to speed. Pretty impressive. Now I'm not suggesting someone stick their leg out in front of it to see what happens when the car or wire hits it, but for the sake of science it is necessary to know whether you can cut a person's leg clean off with an RC car.