The components fit together well and the construction manual is understandable and almost perfect. For assembly you need watchmaker's screwdriver (Phillips). It takes about 30 minutes, until the model is finished. Only Handwäreme is not sufficient to drive the motor. According to the manual, a difference of 25 ° C between the lower and the upper plate must prevail. So you have to cool above (with ice cubes). I have a cup used for the first experiments with boiling water, to which I have asked the Stirling engine. Something has to wait until the lower plate is heated and then gives you the flywheel a little push, already consists of the motor for an estimated 10 minutes in motion until the hot water has cooled sufficiently that the heat difference is no longer sufficient.
I would forgive more 4.5 star rating, but it does not gint. Rounded there are 5 star and given the low price they are justified.
