I am researching the possibility to construct a working stirling
engine using cardboard (0.3 mm or stronger) plus materials like
aluminium foil, plastic rings as bearings, maybe a ballon etc etc.
Heat source could be a glass or bottle with very hot water or a small
candle (which needs special protection of the cardboard of course).
Has anyone experience in such experiments?
Or is there already such a thing?
In the long run my intention is to offer a low-priced cardboard kit
to schools etc.