The sled running with no weights:
Layout has 10-12" radius curves - two with a double-track Y to negotiate (creates drag) Grade on subway is 78 inches long (6.5 feet) rising 7 1/4 inches from lower level to top. You do the math on the % of grade as I've forgotten. It is steep, however. Editors Note: about 9.30%.
Now for the weights.
You can see that from 0-6oz, you need 10 volts to get out of the subway. Then it goes from 10-12 volts for 12-16oz loads. I am not familiar with the ratings of motors, torque, etc., but this motor seems to do the job ok and is more than adequate for urethane or plastic models. I hope this study is clear enough for you.20 Aug 2005
Editors Note: Tests were conducted using a flat car that Tony could add weight to. It is referred to as the "sled".
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