The 2008 article has a video of Harry describing his engine. As it turns out, he is showing the non-working mock-up of the Mark 6 truck engine. It's just a shiny plastic simulation of what Harry thinks a real engine would look like.
But, Harry Schoell being Harry Schoell, he doesn't give the slightest hint that it's not a real engine and that a real engine had not even been built by that point. He just goes on about how great the performance is.
The originally promised delivery date for the Mark 5 was January 2010. They are still working on that, and no one outside of Cyclone has ever admitted seeing one run yet.
So Popular Science never saw an engine run before handing out the 2008 award. They mistook Harry's imaginings and hopes for fact.
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