Subject:
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Re: 9v vs 12v in traction
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Newsgroups:
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lugnet.trains
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Date:
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Thu, 23 Dec 1999 20:53:27 GMT
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Viewed:
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1068 times
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In lugnet.trains, Hao-yang Wang writes:
> Several measures to increase traction for the 12v trains do not present in the
> 9v trains, for example the serrated tracks, the rubber bands on wheels, and
> the inclusion of weight bricks in the locomotive. Does it mean a 12v
> locomotive can pull a lot more than a 9v one?
>
> Also, in Lego's instructions to convert the locomotive of 7722 from 4.5v to
> 12v, it also adds two weight bricks to the locomotive. (See
> <http://www.brickshelf.com/scans/7000/7722/7722-31.html> versus
> <http://www.brickshelf.com/scans/7000/7722/7722-03.html>.) Why do you need to
> increase the weight when powered from the 12v tracks, but not when powered
> from the 4.5v batteries?
>
> Cheers,
> Hao-yang Wang
As for the 12v track, the motors have two conductors on the bottom, to
coincide with the ones that run in the middle of the track. The weights are
to make sure the electrodes will stay together. If the train was too light,
they may not touch, meaning the current is broken.
The 4.5v trains have all their power in the car behind them, they don't have
to stay on the track quite as much as the 12v, because they won't lose their
power.
As for the pulling power of the 9v vs. 12v, I don't know.
Kyle Henneberque
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Message is in Reply To:
 | | 9v vs 12v in traction
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| Several measures to increase traction for the 12v trains do not present in the 9v trains, for example the serrated tracks, the rubber bands on wheels, and the inclusion of weight bricks in the locomotive. Does it mean a 12v locomotive can pull a lot (...) (25 years ago, 23-Dec-99, to lugnet.trains)
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