I was surprised when I watched the YouTube video, at the rate of speed he seemed to obtain, with only his own rowing.
8-12 mph (just a guess since no speed is shown), doesn't seem bad with just one rower (and he's no athlete in his prime).
OK, drag race, 1/4 mile, for pink slips. Souped up Sedgeway vs. Human Powered Car with 2 rowers!