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Mine engine is LTD Stirling engine. Besides lightweight, what other criteria is concern when designing the displacer? How about porosity and stiffness of the material?

Sorry about that, my question maybe giving wrong direction. Mine main concern is the difference of the displacer such as design criteria, advantages and disadvantages for certain displacer. For example why using polystyrene as the displacer material

Hi,
Currently I study on performance on different materials for displacers. Anybody here got test using different types of displacer such as steel wool, polystyrene or others and how is the performance in term of power?
Thanks