Two Cylinder Single-Acting Opposed
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Here is my implementation of Paul's
single acting opposed engine using 2 of the old type cylinders
which I extracted from two 8040 sets. The structure is built up of
beams rather than bricks. |
As you can see, I fashioned the flywheel from an
assortment of plates that I had in my bins. It isn't as elegant as
Paul's. The two train weights at the ends are essential to get the
crankshaft past
the dead centers. |
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| Notice that the early engine
builders used a lot of gears, for the crank and for the valve gear |
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| The engine runs clockwise or
anti-clockwise depending on the gear meshing and the position of the
pin on the eccentric gear. Note that the crank is at top-most
position. |
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| For clockwise rotation of the eccentric gear,
the eccentric gear is 3 teeth above that on the crankshaft. |
For anti-clockwise rotation of the eccentric
gear, the eccentric gear is 2 teeth below that on the crankshaft. |
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| Bird's eye view - the framework
is 28 studs long by 14 studs wide. |
Wow! This engine really runs.
The single acting cylinders slide in and out more easily than the
newer double acting ones. |
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| This virtual model of Paul's
engine was created using Kevin Clague's revolutionary program, LPub
which generates building instructions with stunning
clarity. I used emacs and ldraw-mode to make the pneumatic
tubings. I know some people are averse to emacs but not to fret,
Kevin has also come up with LSynth, an alternative program to fashion
the bendable parts in LDraw. |
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