This my lock-down model, built during the 2020 Coronavirus pandemic — a simple to build beam engine with a parallelogram linkage between the piston rod and the end of the beam. This ensures that the piston rod rises and falls in a straight line.
In the small scale of this model, this is the best representation of this linkage.
In its construction, the beam is a pair of girder frames, which are original Liverpool-made Meccano, separated by collars. The flywheel is a replica part.
It is motorised by an M0 motor and a 19:1 gearbox, and uses four AA batteries.