The 13/4 is very typical of Cyldon, having similarities with most of the other models.
It has the same main components as the 13/3 but laid out in an in-line configuration like the 13/2.
It has a geared output like the 13/5.

The brass boiler is fired by a brass cylindrical three-wick meths burner.
It has a whistle, a safety valve, overflow plug and dummy chimney.
The boiler is held onto the aluminium firebox with the single brass band typical of Cyldon practice.
The copper steam pipe exits from the bottom of the boiler inside the firebox, but does not pass through the flame, so gets no superheat.

The steam is fed directly to the back of the port face of the oscillating cylinder.
The brass cylinder is a single acting oscillating cylinder type.
The crank shaft is one of the few steel parts, with a brass disk crank at one end, and mazak flywheel in the centre. (
The flywheel is the only painted part of the whole engine).
At the other end of the crankshaft is a small pinion meshing with a larger gear wheel mounted on a short shaft in its own bracket, giving a 3:1 speed reduction.
The second shaft has a small pulley attached.
The simple brass brackets are fixed to the long thin aluminium base plate, which has a rubber foot at each corner.
The 13/4 is very typical of Cyldon, having similarities with most of the other models. It has the same main components as the 13/3 but laid out in an in-line configuration like the 13/2. It has a geared output like the 13/5.
The brass boiler is fired by a brass cylindrical three-wick meths burner. It has a whistle, a safety valve, overflow plug and dummy chimney. The boiler is held onto the aluminium firebox with the single brass band typical of Cyldon practice. The copper steam pipe exits from the bottom of the boiler inside the firebox, but does not pass through the flame, so gets no superheat.
The steam is fed directly to the back of the port face of the oscillating cylinder. The brass cylinder is a single acting oscillating cylinder type. The crank shaft is one of the few steel parts, with a brass disk crank at one end, and mazak flywheel in the centre. (The flywheel is the only painted part of the whole engine). At the other end of the crankshaft is a small pinion meshing with a larger gear wheel mounted on a short shaft in its own bracket, giving a 3:1 speed reduction. The second shaft has a small pulley attached. The simple brass brackets are fixed to the long thin aluminium base plate, which has a rubber foot at each corner.
Cyldon