Another Triple Expansion Steam Engine?
Julius deWaal has drawn and published plans for model engines, most recently the Bolton/Bertinat plans for the triple expansion marine steam engine. The triple plans are available to download free of charge at ….https://modelengineeringwebsite.com/Bolton_Bertinat_1.html
I made a model triple using the Bolton plans and castings, several years ago.
Here is a recent photo of my model triple expansion engine operating on steam at the Royal Geelong Show. In the background is a full size version, which is a permanent, operating, attraction at the show. My model is 250mm long, 250mm high, and weighs about 10kg. It has a Stephenson reversing mechanism, and an exhaust steam condenser, both of which work.
It was a difficult build, taking me about 3 years, with a couple of sanity restoring long breaks during which I built other models. The build was detailed on this blog. To check the progress photos and descriptions do a search on “triple”.
I was very happy to finish the build, and ecstatic to see it working on compressed air, and then steam. When exhibited it always attracts a lot of attention, with its myriad of small moving components.
But, I was a bit unhappy, because it does include some errors. These were partly due to the suboptimal plans, and more so to my inexperience. The errors are not apparent to a casual observer, but I know that they are there. They do not interfere with the operation on steam. I had considered making another, bigger, triple, but always backed away, due to the time, complexity, and cost.
But a friend recently sent me a link to the new deWaal plans. The link is below the first picture, above. The new plans are metric, very detailed, and TWICE the size of the originals…. i.e. a model built to the deWaal specs would be 500mm long, 500mm high, and probably weigh around 40kg!
I must be a glutton for punishment, or a bit nuts, because I am seriously considering making another triple, using the deWaal plans and not buying castings but using bar stock. And maybe using some home made castings.
So, watch this space…..
I saw the drawings from Julius deWaal a couple of weeks ago. Nicely done, but I quickly realized that a 2X size would result in 8X volume and weight. Might be good for a steam launch, but a bit large for the fireplace mantel!
Yes Gene, to all of that. But it would make a mighty impressive model. Maybe on a dedicated mobile cart or table. I am very tempted. John.
A friend told me of his 87year friend who having completed building a substantial yacht in his back yard, used the same crane which extracted the yacht onto a low loader to crane in the timber for his next build.
I don’t want to die wondering and I’m sure you don’t.
Hi John, that’s a coincendance, last week I download the other plans from de Waal, the one’s without the condensor and the reverse. This set off plans I didn’t notice. They are great and matric as well. I’m still working on the castingset as you have build.
It will be a great challance to make this machine, but I know you can manage it. So good luck and I’ll follow your post’s off this challance.
Regards Huib from the Netherlands
Hi Huib, thanks for the encouraging message! Always good to hear from you. John
Go for it!