MM12 - The V-shaped engine

Technical details
Year of construction 2001
Power piston stroke 15 mm
  diameter 10 mm
Displacer piston stroke 15 mm
  diameter 10 mm
Flywheel  diameter 37 mm
  material brass
Idle speed rpm
Energy source alcohol
Mass 150g 


This engine illustrates that I may have overdone my search for new ideas and more variety in my engine collection. At first glance, the engine seemed easy to build, as it only required a few simple parts for the gear. I had seen pictures of this type of engine in several sources because V engines are often used to illustrate the working principles behind Stirling engines. Because of the small size of the model I decided not to use a regenerator. The size ratio between the cylinders is not optimal -- there was some confusion on my side regarding published plans, aggravated by not first making a drawing. Still, the engine does work, albeit only under odd circumstances: When the displacer cylinder is heated with a hot gas flame until its copper cap turns red, the engine begins to run incredibly fast, but just for a very short time because all engine components are now so hot that the heat sink ribs can no longer dissipate the heat effectivly. The engine ends up dying when the temperature difference is insufficient.