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Post by AndrewP on Mar 24, 2007 12:07:41 GMT
In my first ever design I have had to make some assumptions of a loco speed of 4 mph at 480 rpm - is this anything sensible? It's a De-Winton in 3 1/2" gauge and 1 3/4" scale (the cardboard mock up is huge!) although I've just discovered a 3' gauge prototype with inside frames so it might metamorphose into that in 5" - then I could play on ground level tracks!
Cheers, Andy
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Post by jgb7573 on Mar 25, 2007 9:23:37 GMT
We've had a couple of 5" gauge deWintons go round our club track at 4 to 5 mph if that's any help. Firing on the run was fun!
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Post by AndrewP on Mar 25, 2007 10:05:05 GMT
It does! thanks jgb. I've found speed data in IMLEC results in ME of 6 or 7mph so with the loco type I can work backwards to calculate rpm. At this stage info from any model is useful.
Cheers, Andy
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dscott
Elder Statesman
Posts: 2,438
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Post by dscott on Mar 29, 2007 9:23:04 GMT
Dear Andrew,
It seems that almost everyone runs far too fast on model tracks and often run at a gradient instead of a steady chuff up it.
I am now on the last few sheets of my simple design, and have managed to do it all without castings. This even for an experienced engineer is a blessing as paying out for a replacement due to bad machining causes lots of upsets.
Now thinking ahead, my design could be built in any scale, being 16 " between buffer beams, double it up with a 12 " dia steel boiler on 7 1/4 " track and you could pull anything.
Half the dimentions, and you would have something to go round a track in your spare room.
For the more adventiourous a simple gearbox could be fitted for a slow and a faster speed as there is a seperate crankshaft and the engine is in full view. I have been looking at stationary engine speed and they do go quite fast, I am still looking at compounding or double expansion
as it makes for a more interesting engine, and you do get your moneys worth out of the steam.
The boiler, 6" dia from Reeves drawing collection.
David.
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