Subject:
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Re: Lego solar car
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 20 Apr 2003 05:16:02 GMT
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Viewed:
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739 times
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Though worm gears are okay for gearing down, they're bad for friction, so in
this case I'd stay away from them.
Also check out this page on the charateristics of various Lego motors:
http://www.philohome.com/motors/motorcomp.htm
As for wheels, larger wheels have lower rolling friction, but higher
weight....
Personally I'd go for wheels from 8430 or 8422.
Good luck, and let us know how you got on!
Duq
"Xanthra47" <jmantor@nycap.rr.com> wrote in message
news:3EA214F0.10708@nycap.rr.com...
> I'd say you're doing well already : )
> Look's very light. You might want to
> use the same wheel as you have in the front
> in the last 2 pictures for all your wheels.
>
> Those wide semi-pnuematic
> one's have good grip, but they'll suck-up precious
> watts in rolling friction. You want narrow, hard
> wheels. The rubber o-ring on the pully is a good
> compromise.
>
> As for the gearing, I'd try experimenting with
> worm gears. Those little motors are ussually
> happier at high rpms and most of the toys that
> I've scavenged for robot parts use at least one
> worm gear stage in the drive train.
>
> One more idea you could gain some stability and
> trim down weight by using the solar panel itself
> as the chassis and hanging the front and rear
> axles off of it as seperate "modules"
>
> Gillish's suggestions are good ones too : )
>
> PS. Graphite spray for locks works
> wonderfully with LEGO(R)
>
> John Henry Kruer wrote:
> > Hello, all. I know I don't post here much 'cause I'm more of a space • fan...
> > but I just wanted to ask you all for some help.
> >
> > My 8th grade science teacher assigned us a project in which we have to • make
> > and race a model solar car. So, because of my (right) belief that Lego • can
> > do anything, I've made the body out of Lego and modified a Lego gear to • the
> > car motor.
> >
> > You can see some pictures here:
> > http://www.jhkruer.com/stuff/
> >
> > My challenge is to make a light, fast car. The primary concern is the
> > transmition, right now I just use a 1:1 ratio of 24 tooth gears, and • either
> > the thick small technic wheels or the really thin wheels. (see the link • for
> > two different combinations of gears and wheels)
> >
> > So, do you guys have any ideas for a light, strong wheel and gear train?
> > Thanks!
> >
> > -JHK
>
>
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Message has 1 Reply:
 | | Re: Lego solar car
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| Ahh, thanks guys. I've tried larger wheels, and even though they look funny, they work the best- a lot better, even now in late afternoon. And I've added more torque using a larger gear, which makes it more powerful. (URL) digital camera movie (...) (21 years ago, 20-Apr-03, to lugnet.technic)
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Message is in Reply To:
| | Re: Lego solar car
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| I'd say you're doing well already : ) Look's very light. You might want to use the same wheel as you have in the front in the last 2 pictures for all your wheels. Those wide semi-pnuematic one's have good grip, but they'll suck-up precious watts in (...) (21 years ago, 20-Apr-03, to lugnet.technic)
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