Help dating stuart s50 engine

The "Crank Web" is made from a circular piece of metal and in most cases is then cut to tapered shape to act as a counterbalance. It may just be that the builder decided to go for a "disc crank" rather than follow the plans to the letter. Maybe the drawings were altered at some time in the past as I've not seen the integral steam chest casting.

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When I saw the title of this thread i thought you were asking how to take out a Stuart engine for a meal or to the cinema!

Edited By Engine Builder on 25/07/2018 08:59:20

Edited By Engine Builder on 25/07/2018 08:59:44

I have recently refurbished three S50 engines obtained in a very poor condition. Two are awaiting assembly. All had the cylinder and steam chest cast as one piece and the circular crank disc. The crank discs had to be cut off to remove the shaft as this cannot be pulled out due to the construction of the bedplate casting. It became clear that using new cranks of the shaped design allowed removal of the crank and axle assembly.

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I won't suggest we introduce 'Model Engineer Dating'. Given forum member's ability to disagree about anything and everything, the chance of finding two model engineers who are compatible is vanishingly small...

Neil

Tubal Cain published an excellent series of articles in ME about building a Stuart S50 starting in August 1992 under the title 'Sally'. One of his notes is that the original S50 was only available pre-built from Stuart and introduced as castings later. He writes that factory equipment allowed the crank to be fixed to the disc with a left-hand thread (so it would not unfasten during running), the plans for the build specified a right-hand thread and peening for practical reasons, but necessitated a sawn disc to allow assembly.

The Sally series is on the website, just change the last number of tehURL to get the next pdf.

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Wow thanks every one for your replies. Even the daft ones! the fly wheel has six spokes so I guess this rules it out from being an early one. Would a reasonable guess be between 1920 and 1950 then? Will take a couple pics in morning. Again thanks for the information every one.

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