Animated Engines, Coomber


Rotary Engine

I first learned of this delightful engine while attending
the PRIME show in Oregon.  A most prolific modeler, Marlyn Hadley,
had one on display.  I referred to his excellent book6
to create this illustration.I have not illustrated the valve linkage, as I’m not exactly sure
what it looks like!  It appears to be a rotary type, incorporated
into the main drive shaft.  Steam would be admitted to one end of
the cylinder at a time, just as in any other double-acting steam engine.

The inner dimension of the stationary ring is not circular, but is
slightly elliptical.  The main bearing is offset from the center of
this ellipse by a one half the stroke length.

2000, Matt Keveney. All rights reserved.


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