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Steam Engines - Slide Valve Series > Unmachined Casting Sets
5004C Gem Twin Cylinder Horizontal Steam Engine - Reversing - Unmachined Casting Set



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5004C Gem Twin Cylinder Horizontal Steam Engine - Reversing - Unmachined Casting Set

As pictured.




The GEM is a horizontal twin cylinder version of the Pevensey engine. The Gem is typical of steam engines that powered many of the larger paddle steamboats used on the inland river systems of Victoria and New South Wales.  The model derives its name from the paddle steamer Gem, which was one of the larger paddle steamers that sailed on the Murray River.  The Gem is really no more complicated than the Pevensey to build, the extra cylinder only adds to the amount of machining not the complexity of the model.



Adding Stephenson's reversing linkage the GEM becomes a horizontal marine steam engine capable of powering model paddle steamboats up to seven feet on a boiler pressure of about up to 80 psi.  The crank throws are at 90º giving the engine self starting characteristics at any position of the crankshaft.



Width 6"

Height 6” 

Bore 3/4" 

Stroke 3/4"

Flywheel diameter 3-1/8”

Weight 1950 gms (when finished)


Click Here to view dimension outline drawing.


Click Here to view the main General Assembly drawings that give a clear view of the structure of the engine.


Click Here to view extracts from the full Machining Plan Manual, supplied with the casting set, that show the more demanding components supplied with the kit to enable you to assess machining requirements for these castings.

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