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Home EngineFlywheel & Displacer |
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Flywheel & Displacer
The flywheel (shown upside down) provides momentum to bring the engine thru the full cycle.
The attached foam displacer moves air back and forth between the hot
and cold chamber sections. The flywheel is made of 1/8" thick 6061
aluminum. The short tab counterbalances the foam. The flywheel has six
spokes of which two are hidden by the foam. The three pie shaped sections
of the flywheel hidden by foam are filled with foam. This prevents the
outer foam sheets from flexing which would reduce compression. The foam
was cut with a hot wire to 1/8" sheets and then scissor cut. The
center hub is brass and press fits to the flywheel. (Not shown is the
latest variation which screws to the flywheel with 3 screws.) The ends of the brass
hub slip fit to ball bearings. The thin crank shaft is 1/16"
music wire (steel) press fit into the brass. Hidden on the other side of
the flywheel are two pieces of tape for precision balance. Alternatives:
the flywheel could be a solid disk of thinner and lighter material
however it must be flat to avoid wobble.
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