Bore: 9mm

Stroke: 12mm

Capacity: 4.575cc

Working Pressure: 45psi or 3bar

Length: 110mm or 4.33″ (excluding reversing handle)

Width: 52.5mm or 2.07″ (excluding throttle handle)

Height: 90.3mm or 3.56″ (excluding lubricator cap)

Weight: 475g or 16.8oz

This engine has been engineered to give a balance between the aesthetic appearance and sound engineering practice. Miniature roller races have been utilised extensively throughout; in total there are twenty nine used for the crankshaft, valve shaft, reversing gears, big ends and little ends. The result being that the bottom end of the engine requires very little lubrication other than minimal lubrication for the eccentric straps. This lends itself very clean and smooth operation together with low maintenance.

In an effort to simulate materials of the age, the block, steam chest and engine bed have been manufactured from aluminium which is then treated to give a textured finish. The components are subsequently hard anodised to BS5599. Hard anodising has a hardness approximating “sapphire” and is therefore very durable and wear resistant. This combination gives a finish that closely resembles that of cast iron. Pistons and slide valves are manufactured from complimentary materials which offer extremely good sealing characteristics combined with very low friction.

Stainless steel, brass and bronze are used extensively throughout the engine. As a result of this the engine is light weight, compact and powerful, offering the modeller an engine that looks authentic and is highly functional which should give years of untroubled enjoyment.



A side view of the engine clearly shows the simulated wooden cladding along with the brass strapping.  The reversing shaft and reversing handle can also be seen.




This side of the engine shows the throttle lever and steam chest covers. The eccentric shaft can be seen running along the base of the engine.




In this view from above the different sized cylinder heads can be seen along with the domed securing bolts. Also the lubrication points in the top of the pillars and the makers name plate are on view.




A lot of detail can be seen in this image, the three dimensional nature of both the eccentric straps and rods together with the connecting rods. The gears for the Maudslay reversing mechanism and the displacement lubricator protruding from the under side of the cylinder block.




Marten, Howes & Baylis steam unit destined for a HM Customs Cruiser “Vigilant” model boat kit featuring the Martin Baylis three cylinder engine.