Many of us have seen old steam engine models up for sale at garage sales and various ... fact that many of them were sold as rough casting kits. This means the quality of the model is only as ...

The $29.99 all-metal desktop Stirling engine kit is one of the simplest. It can be assembled in 15 minutes and is recommended for ages 14 and up. Also for $29.99 is the Exploring Kid Steam Engine Kit.