This is a version of the SP2 with a built-in dynamo and lamp.
The SP2D is based on the SP2 with only a few differences. The flywheel is 3" diameter, compared with 2" on the standard SP2. This is in order to provide a faster drive for the dynamo. The flywheel has a groove in the rim for the drive band, which drives a 1/2" pulley on the dynamo. The dynamo is mounted inside the base of the chimney and is wired up to a large red LED bulb in the top. There is no external electrical connection to the dynamo, so it cannot be used to feed anything other than the built-in LED (without modification). As acquired, it appears to be unsteamed, although it was sold as used. I believe it was probably unused old stock. When first run on steam, it ran OK for a short while then suddenly stopped and jammed up solid. The crank pin had come loose and there was a slight burr on the edge of the cylinder. I don't know which was cause and which effect, or maybe coincidence, but both were easily fixed.| Make | Mamod |
| Model | SP2D |
| Made | 2006 |
| Description | Overtype stationary with dynamo |
| Cylinders | 1 |
| Cylinder Type | single acting |
| Bore mm | 8 |
| Stroke mm | 18 |
| Valve Type | Oscillating cylinder |
| Boiler Type | Horizontal |
| Boiler Diam mm | 45 |
| Boiler length/height mm | 115 |
| Fuel | Tablets |
| Mechanical Condition | Good |
| Cosmetic Condition | Good |
| Paintwork | Original |
| Packaging | Cardboard box |
| Purchased | 30/6/2019 |
| Purchase cost | £91.50 |
| Additional spend |