GTB wrote: ↑Sun Apr 16, 2023 12:57 am
Have you worked out how to fit a motor, ESC and batteries in the model? It doesn't look like there's a lot of space to go around.
There is actually a surprising amount of space, as long as I'm not trying to fit in a big Como motor/gearbox.
My original plan was 5xAAA NiMh together with an Rx41c & ancilliary board, which includes an ESC, in the water tank. Then a double transverse shafted N20 gear motor which was left over from the contractors loco, mounted vertically in the boiler and chain drives to both axles.
However that did create challenges with the drive, in that the front axle has the two eccentrics on it. I managed to print a double eccentric with chain sprocket between them, but that means that the drive sprocket on the motor has to be exactly on the loco centre line to line up with the axle sprocket and that gives me a width problem to get another sprocket on the other shaft - it fouls the sideframe. I've tried to put both sprockets on one side of the motor but the shaft isn't really long enough. So at the point where I stoppped, several months ago, I was thinking of keeping it simple and going back to just driving the uncluttered rear axle.
Thinking about it again earlier today, (in bed!), I realised that there is actually just enough room in the coal bunker to get the motor vertically in there, and that then throws up a variety of options: 2xchain drive forward to either one or both axles, spur gears and layshaft to rear axle ( or both, but I'm not sure my drawing skills are up to drawing and printing a bevel gear between the two eccentrics), etc. What this plan does do however is to leave the boiler empty for centre located weight, or, potentially now space for sound - what did a DeWinton sound like? Given that their main business was marine engines, I'd guess it sounded like a 2-cyl. vertical marine engine....now where have I heard that before??
All needs a lot more thought!