It shouldn’t come as much of a surprise, then, that you can also still buy and build the Visible V8 model engine kit, first sold ... a well-known maker of cast-metal coin banks, and renamed ...

The $29.99 all-metal desktop Stirling engine kit is one of the simplest ... sells for $89.99 and is functional when assembled. The model is advertised as being suitable for ages 12 and up.

The problem with these engines is the fact that many of them were sold as rough casting kits. This means the quality of the model is only ... from a single piece of metal. This engine’s ...