I saw a go kart powered by one of these contraptions in my old neighborhood in South Seattle once. One of the locals put it together. He was quite the mechanic. He took it out late at night and would raise suck a ruckus with that racket, it sounded like a high performance jet was taking off. Shake the ground for miles.
Never did figure the drive train he used. Might have been just jet powered. Plenty fast.
I think he shut it down before he got arrested or blew himself up.