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Four-cylinder steam engine - video
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A tremendous amount of work there and beautifully executed but the overall design is somewhat puzzling.
Placing the flywheel, from which connections to driven devices would be made, in the middle of the four engines would certainly complicate interface design.
Why is the chimney so far removed from the boiler house?
Gear driving a flywheel from multiple wheels leads to friction and wastes torque; a common crankshaft arrangement is usually seen, and for good reason.