My decision to procrastinate with respect to the steam passages has worked, I think. Several suggestions have come in, and I am intending to go with the one from Stuart. And that is to angle the steam passages, which lengthens one on which I can use a larger diameter milling cutter, and to shorten the one under the steam port. See the red lines for the proposed changes.
While waiting for a light bulb to switch on regarding the dark places, I have not been idle.
I moved on to a part of the triple expansion steam engine build which I expect to be easier. And that is the condenser unit.
The condenser is the box shaped protuberance attached to the columns. I believe that its function is to convert the last dregs of steam, after driving the 3 pistons in succession, into water, for re-use in the boiler.
These are the components, machined and ready for assembly.
The holes in the end plates have 0.5mm of material between them. Tricky drilling, but a breeze for the CNC mill.
My name is Giacomo, from Italy !
I’m 38 years old, and I have a “start up” which is building a plant that produces electricity through the steam of a biomass plant.
Now I use an Indian steam engine, but I’m not happy of it…
I saw the steam engines in your website, and they are beautiful!
You might be interested to develop an engine for my business less beautiful and more powerful?
I need to control costs, because my focus is to bring electricity in developing countries, and in those nations to find the money is a big problem!
I hope you like my idea, because I do not have the necessary experience to realize a good steam engine, but I can easily make it if you can help me to design it …
Best regards in advance
thank you for your very kind compliment. I must immediately admit that I am a beginner, having made only 2.5 steam engines, and they are other peoples designs. I am not qualified to help you, unfortunately.
I wish you the best in your endeavours
” I believe that its function is to convert the last dregs of steam, after driving the 3 pistons in succession, into water, for re-use in the boiler.”
That’s probably the reason in a small installation- such as a tug- where carriage of the feed-water would be an issue, but in a big installation like a pump or generator it decreases the temp/pressure if the “after expansion” steam and increases Carnot cycle efficiency.
Same for superheating – which improves Carnot efficiency by increasing the “before expansion” temperature and pressure.
Multiple expansion can nearly double the thermodynamic efficiency of a steam engine (from 5% to 9%) but the effect probably isn’t real in models and we’d do better to focus on insulation, heat recovery.