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Hello Guys, I am in a discussion with a friend about 2 stage Doble engines. What is the best way to calculate the efficiency? Is it considered a carnot engine? or something else?

You can use mcmaster.com This is the link to the copper tube: https://www.mcmaster.com/5175K138/ or in the UK you have this: https://www.bes.co.uk/copper-tube-42mm-x-3m-13596/

Hello, I have come up with this design for now. The pressure I am looking for above the small piston is 52bar. It is supposed to use steam Also Do you guys have any suggestion on gearboxes? I am looking to having 1.1:1, 1.8:1, N and R options

I am running some FEA simulations. So far so good, unless I have something really wrong. I am using a piston similar to the ones in an IC engines. I think it holds better alignment. And as I am new to steam engines, please correct me when I am wrong. I sometimes have strong opinions about...

Sorry I worded that wrong. What I meant that with today's capabilities, we can make a simpler design.

Those seem a little bit too complicated for today's manufacturing capabilities. I think some casting and machining afterwards can help reduce the number of pieces. I was running some FEA on aluminum and they seem to be doing good

Is there a reason why the high pressure pistons were domed?

@GreenTwin Thank you for your advice. I was thinking of looking into using some composite material for the pistons. I will test and simulate different options. If it doesn't work my second choice was cast iron. Do you have any advice on the bearing material between the crankshaft and connecting...

Thank you very much guys, that has been very helpful. Especially the formula provided by @peterl95124. I was able to get at least a preliminary design of the pistons required to generate the forces. For the next step, is there any tips and recommendations when it comes to designing the piping...

Thank you @GreenTwin for this chart. That is very extensive. I am looking at the Doble steam engine used on the E-20. From my understanding, it uses pairs of single acting cylinders. One that is high pressure and one that is low pressure. From what I found is that is uses 51.7bar steam pressure...

Hello, I am a mechanical engineer and haven't touched anything that has to do in thermodynamics for 15 years (gosh I just realized how long ago I graduated). I am working on a steam engine and its been a bit rusty to get back into the whole subject. One Thing that I am not able to figure out is...