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I've been doing some research on the history of LEGO air-powered engines of both the compressed air (LEGO pneumatics) and high-volume-low-pressure variety. I found it interesting that to build a LEGO air-powered engine before pneumatics parts were released in 1984, the piston and cylinder assembly had to utilize the close tolerance of the bricks and had inherent leaking problems. This type of engine, often known as a LEGO vacuum engine now, is quite popular still since it requires relatively few special parts. I've written a wiki page about it, but just for interest, the first known LEGO air-powered engine was made by the prolific YouTuber Matthias Wandel in about 1985. This is followed by Dan Hartman's first oscillating engine of 1986. I got to interview Erin, who built his first in 1994, without knowledge of other builders, and here's that video. Check the description for my wiki page.
