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After I decided to build a steam launch, I decided to prove myself I
was able to machine a complex steam engine.
I was inspired by Frenk Fontein, who
once showed me his for his steam launch Orion. I like the fact that there are no
rotating parts and that, because of the vertical postition all parts can be seen
moving easily.
Weir steam pump ready
castings the way you get them
steam chest partly assembled
Water pump, valves and seatings
detail of the mechanisme
Drawing of the mechanisme
The
green dotted part moves up and down a little, just at the end of the stroke. The
moment this part starts moving can be set by the nuts at the lower part of it.
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Once the green dotted parts moves (down in this example),
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the pivot valve opens the upper steamport,
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steam goes through a port that can not be seen and comes back at the
top of the left part ,
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moving it down (red arrow).
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This part will move the steam valve down (dark red),
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thus allowing steam to get above the piston in the cylinder
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the cylinder will travel down,
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just before the end of the stroke, it will move the pivot valve in the
opposite direction
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the cycle starts all over again, this time in the other direction.
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