If you can push your loaded train at a suitable speed by yourself then the power used will be somewhere in the order of 100W to maintain speed on the level and maybe 300W to accelerate to that speed. Have a think about how much power you actually need for the job you have in mind. I had one in the scrap box this gave a 4:1 reduction, this was further reduced by a 2:1 chain drive to the rear axle, giving a total of 8:1, & with the wheel diameter of 90 mm (I think!) gives a max top speed calculated of 12.5 kph & an actual with my son only on board at a track with speed checker of 12.88 kph. The motor I have is a 24 volt, 7.2 amp,5000 rpm X wheel chair motor, as such required gearing down just a bit! I used angle grinder heads to give a 90 degree drive change. Heres the info on the motor & drive chain In the general view ou can see the "smoke" for the smoke generator coming out the funnel, works ptretty good inside & ok outside when stationary provided the wind isnt blowing too strong!Ī friend built an electric about the same time & tried a simallar idea, but i think it was with a sliding pad for the chain, he cant of had it right as he reckoned it used up to much power, the wheel idea would probable work better but only having 11 tooth sprockets these not a lot of room! I recommend that you buy a decent controller from the outset, the original I used worked fine but didn't have regen braking, & as I had quite a few young people driving, & plenty of adults, having to explain that every time & them forgetting could lead to issues! On a cost bases the batteries I used are marine, I figured that they take a pounding so with the fiberglass matts in them would help, & deep cycle were just that much more expensive again! The controller, I upgraded it last year, should have done so years ago, to a 4QD DNO 5. I have some photos somewhere of him in bits if you are interested. ![]() ![]() The drive between the axel is such that the bottom length of chain is tight when running forward, helps lift it up to give you a bit more clearance if running on ground level track. The motor runs 5000 rpm, the gear box has 4 to 1 reduction, & allows you to get a 90 degree change in a very compact area, from there a 2 to 1 to the axel, then a another chain to the other. I have mounted the motor vertically in the middle so I could get a battery each side.there was just enough room, I used 2 lengths of 50x50 angle across the frames, & built up from there to mount the motor & gear box. I deveated from the plans as the original was 12volt with a car air con motor, if memory serves, hung between the frames.
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