熱泵發(fā)動(dòng)機(jī)

This is my veion of the Ericsson pumping engine which I cotructed and successfully ru.Originally I downloaded Geoff Hussey's model which is 1/4 scale but found a few anomalies along the way.Most parts were re-drawn at 1/8th scale but I am indebted to Geoff for giving the groundwork model.