Hot answers tagged wheel
The first that came to my mind (for the MER-wheels) is the Wheel 70 x 28 mm Futuristic, with Black Tire:
The largest wheels I know are these (I measured 110x63 mm, including tyres), but they are quite rare (only available in one single set): Weels: 22969 "Wheel Technic Racing" Tyres: 32298 "Tyre Power Puller" The wheels itself are not that big, but if you include the tyres, they are really huge: They would probably work really well for an RC car.
This seems pretty much bordering on the impossible, given the current state of (LEGO) engineering capabilities. What you are describing is a Von Neumann Machine and as far as I know nobody succeeded in creating one, not just in LEGO but in general. The problems you'd have to overcome: The robot must be capable to exert sufficient force to overcome the ...
With a bit of trigonometry and some observation we can estimate a theoretical limit to the maximum length. I assume you are looking for the maximum length that would run on the sharpest possible curve, which appears to be one made with flexible track. By observing this photo of 52 flex track pieces arranged in a circle, we can estimate that each piece can ...
Here's what found after playing with all kinds of combinations. With this the three rovers will be at the same scale (about 1:5.8). This scale is small enough that the big rover (MSL) would not be a monster to build. The ratio is almost spot on and the only main problem is that the MSL wheels (the big ones) will have those big cleats. On the positive ...
You might also be able to make wheels out of parts, such as a circle of hinges with brackets and cheese slopes. I'm sure there are better ways, but that was the first that came to mind.
The largest wheels I've seen are "Wheel 81.6x15" 2903 To show scale: There are larger ones on the Hailfire Droid but these probably aren't good for your needs:
It looks very much like pullback of the promotional LEGO sets with ferrari an shell from 2012. They have got the set numbers 30190 to 30195 and there is an additional crew pack (30196).
It would probably be easiest to work out the which piece should be used for the biggest wheel. The largest wheel I could find came in the 8420 Technic model. Two of which can be used in tandem to increase the surface area of the wheel: Wheel Technic Street Bike (8420) The medium wheel could be a rather blocky Wheel 20 x 30 Technic, the 68.8 x 24 or the ...
An alternative is the 94.8x44 balloon tires. While they are not as big as the ones elusive suggested, I imagine they are easier to get as they have been in some recent sets. Comparison: Left: 81.6x15 Middle: 94.8x44 balloon Right: 81.6x38 balloon
There is also the Technic Gear Mobile Devastator Wheel, but it's not really suited if you want a realistic car. If you want to build a funny-looking vehicle, however... You could even build a complete vehicle which fits completely inside the radius of two such wheels, so that it can turn on itself when you reverse the polarity. Again, not a car, but super ...
The math you're suggesting may work for going straight forward or backward where slipping is limited. For a turn, it will not come close. Even getting the center of rotation of the turning robot will be difficult. The tracks will have to slip. A tracked robot can not turn without those tracks slipping. Differences in friction will alter the turn. More ...
I was able to find a few elements that are able to make this connection possible. I'm guessing the designer used some type of bar-sized element which is made from a different material that is able to compress slightly more than regular ABS. For example, the softer plastic used on some minifig weapons seems to work nicely: Another option could be flexible ...
A 360 degree turn takes: (width of robot/circumference of wheel) turns, neglecting track thickness, assuming the tracks are at sides if the robot. The length of track doesn't matter. Your robots non-slipping part of the track is traversing a circle of diameter=width of robot. The other parts of the track are sliding across the surface. A longer robot / ...
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