Subject:
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Re: My first MOC locomotive
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 14 Mar 2001 02:30:57 GMT
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Viewed:
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1004 times
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> > I love the rotating fan/vents on top! Does the extra power
> > drain on the 9V affect the speed at all? (I wouldn't think so.)
>
> No, it doesn't seem to. But the big ol' 9v motor makes the loc very
> top-heavy. It can't do corners at full speed if it has a decent straight
> lead into them. If I do that again, I might try using a micromotor and
> gearing it up. On the other hand, it's a freight hauler and the slower
> speeds make sense anyway.
>
> > How fast do they spin? Mind if I try to do the same thing?
>
> I don't mind- as it is, I copied the idea from Dwayne Towell. As far as how
> fast they go, it's fast enough that they look like vents and slow enough
> that it is very visible (as opposed to being a blur).
If you thought you needed my approval, consider it given, but I don't think
you need it. I didn't use a normal train plate. I put the 9V motor as low
as I could in the design--I actually built the "fuel tanks" around it so it
kept the center of gravity very low, possibly below the bogies. Also I
recommend a loose coupling between the fans and the motor to allow some
tolerance for curious fingers. I used a 3:1 (8:24) gear ratio, the blades
are not a blur but clearly are fast at top speed and still noticeably turn
at the lowest setting. An unusual/unexpected side effect occurred--moving
the train by hand causes the fans to turn since the train motor acts as a
generator to power the 9V motor. This leads most people to assume the fans
are physically (via gears) connected to the wheels and wonder what the
linkage is like.
Dwayne
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Message has 1 Reply:
 | | Re: My first MOC locomotive
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| (...) Dwayne's is a much more massive engine, and is a lot more stable than mine to begin with. I hadn't thought about the effect of fingers on the fans- perhaps a belt drive with a rubber band would be a good idea. I wish I'd taken the opportunity (...) (24 years ago, 14-Mar-01, to lugnet.trains)
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Message is in Reply To:
| | Re: My first MOC locomotive
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| (...) No, it doesn't seem to. But the big ol' 9v motor makes the loc very top-heavy. It can't do corners at full speed if it has a decent straight lead into them. If I do that again, I might try using a micromotor and gearing it up. On the other (...) (24 years ago, 13-Mar-01, to lugnet.trains)
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