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In lugnet.general, Allan Portillo writes:
> The steering was not impresive. It had a tunring circle of 1.62 meters. The
> worm gears in the axles meant that I could use fewer gears in gearing it
> down. This decreased the amount of play in the complete transmission and so
> starts climbing as soon as it hits an obsticle. In first and second gear it
> would climb slopes as steep as 68 degrees, at which point it's front wheels
> lifted and it would roll end over end down the slope. Those wheels are just
> so grippy. In third gear it would climb a 63 degree slope at its maximum. On
> a 64 degree slope, it would make it 1 time out of 3.
>
> Now lets see. 63 degrees is 0.7 of a full right angle and it weighs 4.5
> kilograms. 4.5 multiplied by 0.7 is 3.213 kilograms of tractive effort. This
> is the power it has to go forward ( I think ). At this point the motors just
> stop with a twitch or two every now and then.
I might be wrong, but if your incline is at 63 degrees, then the component
of force (force being the weight of your model) along the inclined surface
is = 4.5*sin(63) = 4.0 kg. That is the force, or pull, your model is
generating in a "forward" direction in 3rd gear.
However, I would use the 1st gear case on a 68 degree incline for this
calculation. Your model wasn't stable, but the motors didn't lock up, right?
Therefore the force is = 4.5*sin(68) = 4.2 kg.
But I'd bet your model can pull much more than 4.2 kg!
Anyway, very nice model! I enjoy a good 4x4 and yours is an excellent model.
What's even better is that you've built solid axles instead of independent
suspension. That's more like a real heavy-duty 4x4.
> In fifth gear it can travel 1.18 meters per second.
=4.2 kph, 2.6 mph
That's probably faster than most people walk! Impressive for a large Lego model.
TJ
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Message has 1 Reply:
 | | Re: a most splendid 4x4
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| (...) You should have saw the weird looks I got when I was walking down the street with it. I spotted a women in a bus shelter with a dog next to her sleeping. So what did I go and do. I drove over the dog, boy did it jump (smirk)8-). This top speed (...) (25 years ago, 25-Oct-01, to lugnet.general, lugnet.technic)
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Message is in Reply To:
| | Re: a most slendid 4x4
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| (...) The steering was not impresive. It had a tunring circle of 1.62 meters. The worm gears in the axles meant that I could use fewer gears in gearing it down. This decreased the amount of play in the complete transmission and so starts climbing as (...) (25 years ago, 24-Oct-01, to lugnet.general, lugnet.technic)
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