This is a twin cylinder horizontally opposed stationary engine, although it was probably designed for marine applications. At first glance, from a distance, it may appear to be an oscillating cylinder type, but in fact, the cylinders are fixed and a rotary valve is built into the crank shaft and it's bearing. The connecting rods are connected directly to the pistons, similar to those in a car engine.
The cylinders are approx 7mm bore x 7.5mm stroke. The connecting rods are both connected to a single crank pin. The crankshaft bearing contains a rotary valve, the rotating part being the crankshaft. The 18mm diameter flywheel is a deep marine type, mounted on the end of the crankshaft.| Make | Microcosm |
| Model | M28 |
| Made | c2017 |
| Description | Stationary/marine |
| Cylinders | 2 |
| Cylinder Type | single acting horizontally opposed |
| Piston Diam mm | 7 |
| Stroke mm | 7.5 |
| Valve Type | Rotary |
| Boiler Type | N/A |
| Boiler Diam mm | N/A |
| Boiler length/height mm | N/A |
| Fuel | N/A |
| Mechanical Condition | Good |
| Cosmetic Condition | Fair |
| Paintwork | N/A |
| Packaging | |
| Purchased | 15 March 2018 |
| Purchase cost | £55 |
| Additional spend |