Add the original value to the min value, and put that in 'piston-volume-max'. Divide that value you just calculated by 10, put that in 'piston-volume-min'. Unless you happen to know the clearance volume (and if you do, you are very lucky) then it's rule of thumb time. This value you have calculated is the *difference* between the two tags. Multiply that by the piston-area tag value.

piston-volume-min and piston-volume-max:Ĭonvert the piston stroke to metric (meters).

Calculate area: Square, and then multiply by Pi. For two cylinders, 0.0174, 1.5254 is the standard value.Ĭonvert diameter to metric (meters). This allows you to tweak the quartering, which is important for 3 and 4 cylinder locos. Unless you are doing something very very strange, this will be 2. Some maths is required, as what we ask for in the config file is generally never in the units you've found, and we ask for areas and volumes where you will find diameters and lengths.

Max flow rates between boiler and steam chest.

What you are highly unlikely to have, but turns out to be vital information: Best is a dynamometer run, but a footplate account (or even a collection of anecdotes from drivers) also works.

An account detailing the performance of the loco.

The full heating surface area including the tubesįor notable locos, or if you happen to get lucky:.

Weight on axles by either individual axle or groups of axlesĪ little challenging to find, but often available if you look hard enough:.

A basic diagram for the loco, showing where the tube-plates are.

The coal type in use in the area the loco operated.

The cylinder diameter and stroke in inches.

Not all the relevant data for steam locos is available.

2.1 Number and arrangement of Cylinders.

Trainz american steam engines