What is the Stirling Engine or Stirlingmotor ? 

A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work.The engine is like a steam engine in that all of the engine's heat flows in and out through the engine wall.

ROSS YOKE Hot Water Stirling Engine – JAJ 850

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DIY Stirling Engine Kit | Educational Toy Kit  Stirling Engine from stirlinghobbyshop.com - YouTube

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Place this  Stirling Engine on a cup of hot water / hot coffee  & it may needs some time to start. The time is depends on the heat source given & is generally within 30 seconds to 2 minutes...

The engine won't start by itself, but given a little push in the proper direction (strong enough to coast the parts over for several cycles), the engine will take off and continue running on its own.

The top plate is made from acrylic  , bottom plate made from aluminim ,therefore all the moving parts are visible.

Specification:-

Weight : 300g

Sizes : 120mm x 120mm x 150mm

Material : top plate - clear acrylic ; Displacer -polyfoam (colour may be vary)

               bottom plate & others - Aluminum

Package included:-

1 set of Ross Yoke Stirling Engine

** For safety shipping, we had uninstalled the flywheel