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Stewart S50 Name

Where does the name come from ?

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John Gray 713/01/2022 11:28:39
5 forum posts

I’ve just started my first steam engine, a Stewart S50. Very early days yet, but it’s going well (I think). As with all new projects time at the lathe/mill is only a small percentage of the actual time spent….Thinking time, weighing up, call it what you like. I imagine this percentage changes with time and gained experience, il look forward to that. Anyway, one of my random thoughts the other day made me ponder where does the name come from? The Stewart 10V, I can see that the “V” would indicate that it’s a vertical build, and there were others, so probably the 10 was it’s time place so to speak. The S of S50 could indicate a stationary engine, but surely there aren’t 49 predecessor’s, are there?

Former Member13/01/2022 12:09:11
1085 forum posts

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Former Member13/01/2022 12:09:12
1085 forum posts

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JasonB13/01/2022 12:53:11
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22574 forum posts
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For a start it is Stuart not Stewart!

The S50 was the replacement for the slide valve horizontal progress and they distinguished between the slide valve and oscillating progress engines by using "S" for slide and "O" for oscillating so that is most likely where the "S" came from.

I think the 800 gas engine is the highest number off the top of my head so not sure where the 50 came from and they also have quite a few that are just names, or letters such as the Lightweight or BB.

Good history of the various engines to be found here

Former Member13/01/2022 15:48:01
1085 forum posts

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Peter Cook 613/01/2022 17:01:24
259 forum posts
73 photos
Posted by John Gray 7 on 13/01/2022 11:28:39:

...time at the lathe/mill is only a small percentage of the actual time spent….Thinking time, weighing up, call it what you like. I imagine this percentage changes with time and gained experience,

sorry Nope - Not in my experience. Time and experience getting the mill and lathe to do what you want grows far faster than the creative thinking and planning - you are always thinking of new things - so over time mill and lathe time shrinks as a percentage of the project.

However on the bright side total project time shrinks so you get more projects done.

John Gray 713/01/2022 17:42:43
5 forum posts

Thanks for the replies. Seems likely then that the S was more to do with the slide valve construction and not indicating a stationary engine. Interesting info on the link about the Stuart engines, and apologies to anyone offended by my spelling issues.

Former Member13/01/2022 17:47:02
1085 forum posts

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Dave Halford13/01/2022 17:49:24
2006 forum posts
23 photos

These were originally supplied ready machined just needing a screwdriver, a spanner and pliers

Former Member13/01/2022 17:56:32
1085 forum posts

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Zan13/01/2022 18:52:50
308 forum posts
20 photos

Just a guess but 50 parts/components?

Former Member13/01/2022 18:57:58
1085 forum posts

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