I take your point, bu thtat's 2:49 of bad camera angle, then a lot of un-necessary panning if they'd just zoomed out a bit. Are we to assume that's a flash boiler and prop driven boat.
Are there restrictive rules?
My second favorite aerospace company is ArcaSpace. They have an electrical steam rocket. Does that count as a heat engine?
Then there was
Alexander Lippisch
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The Lippisch P.12, P.13a and P.13b were related design projects for a ramjet-powered delta wing interceptor aircraft studied in 1944 by German designer Alexander Lippisch... The P.13a and b were to be powered by producer gas made in-flight from powdered coal.
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