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Stuart Turner #1

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John Purdy16/08/2019 19:31:39
191 forum posts
61 photos

    Finished my Stuart Turner #1. Bought the castings second hand in 1996, They were initially bought in the late '60s or early '70s, and when I got them they had been through 2 or 3 (or more) owners. Everything was there except the rings were broken. Finally got around to starting it on 5 Oct. last year.
    Have run it on air for around an hour to run it in and it now will run down to 12-13 psi. The rings are producing quit a bit of friction in the bore. I noticed that at the slowest speed it runs quite unevenly. After a bit of head scratching and watching it was apparent that it was slowing down over TDC the once about 30 deg beyond it would speed up down and over BDC only to slow down again approaching TDC.
    So as an experiment I removed the rings and the piston rod packing and found it turns over extremely freely (the piston has about 2-3 thou clearance in the bore).  When turned over slowly by hand and the piston gets to about 20-30 deg after TDC  it  rotates by it's own weight down to BDC, slightly beyond then back to BDC. So it would appear that the slow speed unevenness is due to the fact that there is no counterbalances on the crank to compensate for the reciprocating mass of the piston, rod, crosshead and con rod. Might look at fitting some in the manner of the ST#5 as an experiment.


Edited By John Purdy on 16/08/2019 19:32:52

Edited By John Purdy on 16/08/2019 19:36:11

Edited By John Purdy on 16/08/2019 19:41:39

JasonB16/08/2019 19:36:03
17028 forum posts
1825 photos
1 articles

Very nice John, and a pleasant change from the usual greens, neat cladding too.

Bill Chugg16/08/2019 19:56:52
962 forum posts
6 photos

Very neat job indeed - well done.

Prefer the colour scheme to the Stuart green


Jeff Dayman16/08/2019 20:14:51
1717 forum posts
45 photos

That's looking great John! Well done! I like the colour scheme as well.

Brian H16/08/2019 20:17:00
1389 forum posts
100 photos

Very nice John, well done,


mechman4817/08/2019 10:54:27
2549 forum posts
385 photos

Very nice John; I'm tending to go for other colours as well rather than sticking to Stuart green & black. What is the colour on your model, it looks very similar to the rattle can colour of 'FED Aero crème de la crème' I have ?


Harry Wilkes17/08/2019 12:03:15
792 forum posts
60 photos

Nice job have to agree with Jason pleasent looking colour


John Purdy17/08/2019 17:06:04
191 forum posts
61 photos

Thanks all for the complimentary comments.

George, the colours, I mixed up from scratch as I couldn't find anything like I liked in either paint tins or spray cans from builders or auto supply shops. The brown is what I'd call a "bright chocolate" mixed up from a quite dark brown with some red added and then a little yellow to lighten it up. The cream was white with a little yellow to make a bright cream, then a drop or two of the chocolate to tone it down. It actually is a little darker that shows in the pictures, the colour balance has made it come out quite a bit whiter. There was much mixing up of drops of paint on a sheet of paper till I got what I liked ( then trying to remember what I had used!).


Edited By John Purdy on 17/08/2019 17:08:16

Emgee17/08/2019 17:28:11
1343 forum posts
212 photos


As others have commented makes a change from usual colours, everything on your engine looks crisp and well finished, congratulations.


Mick B117/08/2019 17:42:21
1346 forum posts
75 photos
Posted by Jeff Dayman on 16/08/2019 20:14:51:

That's looking great John! Well done! I like the colour scheme as well.

+1 - nice work indeed.

I wanted a colour like that for my Stuart Beam about 20 years ago:-

stuart beam.jpg

(Matrioshka courtesy grandkids )

I used a Humbrol enamel in the end, but I don't think I've any left and don't know the code no. Your lagging is good - I might add some to mine when I do a refurb, which it's obviously beginning to need...


Mark Gould 121/08/2019 17:02:44
177 forum posts
107 photos

John, that is a beautiful No. 1 and as already said a welcome change in colours. Well done, I know how much work goes into making a running No. 1 as I am experiencing myself.

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