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Lego Steam Engine with Marshall Valve Gear

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Published on Sep 21, 2012

A working mill vacuum engine with homemade flywheel, and a second vertical engine on the same base! Marshall is similar to Hackworth, except that the sliding block on Hackworth gear is replaced with a pair of swing links on Marshall. Baker expansion gear works on the same principal as Marshall, both using swing links. The two flywheels are made from 4" schedule 40 PVC pipe bought from my local ACE hardware store. I tested out a new cylinder design that makes it look much more like a cylinder, rather than a square.

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