Stationary Engine Kits
Anthony Mount Models
Benson's Vertical Engine
This type of engine was called by the Victorians a vertical engine. An engine with the cylinder above the crankshaft was called an inverted vertical. This engine was built in the middle of the nineteenth century and is typical of the type. Incorporating a forked connecting rod. Long piston rod which avoided a crosshead and slide bars. It was simple in design and would have been built in small powers. Benson’s design is unique as far as I know in using a single column to support the mechanism.
The design is attractive to the modeller in that the single column is easy to turn and the entablature makes lining up the crankshaft simple. The governor is also large in relation to the engine, which gives us a chance to make it operable in this small size. A governor is also interesting to make and looks good in operation. The forked connecting rod is shown with proper straps and wedges. But this could be simplified to plain round ends with bushes if desired.
There was no scale given with my source material, but using my usual scale of 1/12 the full size flywheel would have been about 6’-0” diameter which gives a 6” (150mm) diameter flywheel for the model. This makes up into quite a small engine. The base, entablature, flywheel and cylinder are gunmetal castings. The bracket, pump body and eccentric straps are brass lost wax castings. Also supplied are the skew gears for the governor. The rest being made from bar material.
A set of drawings are available all A4 in size and numbering 21. A parts list is also included. The drawings are dimensioned in both imperial and metric. The imperial size being given first with the metric dimension below.
The engine was serialised in Model Engineer from 5th July 1996, Vol. 177 No 4020 to 31st December 1996, Vol. 178 No 4032, alternate issues.