I need some advice in how to design a boiler. My plan is to build a vertical boiler for a 5inch gauge class C53 tram engine. Although there is a horizontal boiler in a C35, I thought it would make it easier to build in a vertical boiler as I am a novice to model engineering. I am going to be building this with a family friend who has made many live steam models. I know it would be easier to find a design that has already been created, but I would like to give myself a challenge.

I have already drawn out a prototype boiler. The plan for the prototype boiler is to be 130mm diameter and a height of 200mm. The height does not include the length for the chimney. The fire box will be 90mm diameter and 70mm long. The fire tubes will be 10mm diameter and 100mm long and the smoke box will be 30mm long on the end. I need some advice on the calculations that I need to make and the equations for them.

If anyone can help it will be appreciated 😀

Toby