Free Plans: Jeroen Jonkman's

Jeroen Jonkman built this Gamma type Stirling engine for his father’s 60th birthday.  He also drew a nice set of plans for it and is very generously sharing them.  You can download them here from MachinistBlog (PDF) or from HMEM if you’re registered there and logged in.  I asked, but Jeroen didn’t

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Free Plans: David Kerzel’s C02 Engine

Here’s another set of free plans and construction notes by David Kerzel.  These are for a CO2 engine which is much smaller than his very beautiful hit & miss engine, which you can also get free plans for.  David says the flywheel is too thick, which should be easy to fix.  He also thinks the

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Free Plans: David Kerzel’s Hit & Miss Engine

David Kerzel has free plans for this beautiful hit & miss engine he designed.  It may look like it’s made from castings but it’s actually made from bar stock.  The cylinder has a .75-inch bore and the flywheels are 3.5-inch in diameter.  The plans also come with some well-written and very helpful

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Free Plans: Marconett Engineering’s “David” Steam Engine

"David" Steam Engine by Marconett Engineering

Marconett Engineering sells plans for a variety of model steam engines that are made from readily available “barstock” instead of castings.  They also have a set of free plans and some very helpful construction notes for a nice oscillating steam engine. You can find them near the bottom

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