Silcantar

That's amazing. Those could not look more real.

That's pretty cool. Not exactly a fair race, though, is it? You're going to have to build a second version of this car, or level the playing field a little somehow! Does this return-to-center steering work better than the version on the yellow car? (The yellow car uses a hockey spring, right?) From the video it looks a little better. I think that the system you used here seems to be one of the more elegant and efficient return-to-center systems I've seen. Plus, it doesn't use any of those rare hockey springs!

I wouldn't sell any MOCs (not that I have any worth selling), but I have recently started selling some old (non-Technic) sets that sell for good prices on eBay. I recently got $115 for the 2002 3739 Blacksmith Shop, which was originally $39.99. If they have any old sets that they value less than the new set, that are in good condition, including their instructions (one of the main problems with many of my sets, a lot of the older instructions are in terrible condition), they might be worth selling.

Might be leverage. If the arm is horizontal at that point, the torque exerted on it by gravity would be at its maximum.

Geometry is amazing. Full of "easter eggs". I don't know of any neater ways of converting rotation into translation, but I know more practical ways. :)

Dark blue would be awesome. Dark gray maybe, purple would be cool, too.

I could, but it would rely solely on friction, and I'm not sure if you can get the wheels to just touch, without too much or too little friction. I've already got a lot of it prototyped in LDD already, anyways.

It doesn't skid steer, so I wouldn't need two motors for that, just for power. I could use a drive shaft, but that would force me to make the frame even wider than it already is. The chain wouldn't twist (it wouldn't, even if I wanted it to); it would only be between the 16t gear and the 24t gear in this picture: The Technic triangles connect to an old style turntable, which is where the steering will pivot.

So, I was thinking about building a PF-powered Technic version of this vehicle, from the video game Borderlands: More info It would have 4-wheel drive, and the front wheels steer by rotating sort of like a chopper bike, along a mostly-longitudinal axis (you can kind of see the rotation point in the picture). I was wondering whether you think that a chain drive (one on each wheel) would be strong enough to power it, if I built it to scale with these wheels (standard on 1:17 trucks, I think)? Also, do you think I could get away with 1 XL motor for propulsion, or would I need 2?

It's still not available in the US.

I've used NXT with LabView, if that's what you're looking for. I'm not sure how much help I can be, I found it to be rather frustrating. I'm new to both LabView and NXT, although I do have two Robotics Invention Systems. Someone with more LabView experience might find it less frustrating and be more helpful.

Josh Lucas here. Thanks, David, for posting this here. I haven't actually built this in real life (I only have 2 driving rings), so don't ask me too much about implementation. I thought it was a great idea, though, to put the driving rings in a circular arrangement, rather than a linear one. It might be too bulky for most uses. I actually mostly build 1:15 scale supercars, so I don't actually see myself using this any time soon. @Frequency: You might be able to solve the problem of the lack of a gated shifter, in part, by using old style axle connectors, which makes the driving rings ratchet, so they won't slide around. @TechnicJuan: Piotr needed the output axle offset by 1/2 stud for the model he was building. I couldn't tell you any more than that. I omitted the offset because, one, it's impossible to do in LDD and technically illegal, and two, because, most likely, no one following my instructions would need the offset.

My entry for the "LDD+Real Bricks" category: This 1932 Ford Model B Roadster is an alternate model of the 1994 Lego 8880 Super Car. Only pieces from the 8880 Super Car were used in this model. Features: Ford Flathead V8 engine Front and rear live axle suspension Working steering via steering wheel and Hand of God "Four on the floor" manual transmission Convertible roof Lake Pipes In addition, this model is unique in that it it can be converted from a production Model B to a Hot Rod by removing the hood, running boards, fenders, and adjusting the suspension. I substituted some of the parts which are not available in LDD, particularly the specialized suspension parts, with combinations of other parts. Some of the substitute parts do not actually exist in the colors used, but the colors reflect the colors of the original parts. More on MOCpages and Flickr LXF file

You can create 60 degree angles (which are effectively the same as 30 degree angles) by making an equilateral triangle with Technic bricks, too. It may not be as convenient as the the aforementioned methods in some cases, but there are likely situations in which it would be useful.

For the LDD-only category: This is the 1960 Chevy C Pickup Truck, the forerunner to the Silverado. At 1/16 scale and 35 studs long by 14 studs wide by 13.5 studs tall, it is technically about the same size as Tyler Reid's '32 Ford Speedster, but it is built of classic-style Technic, which is harder to build compact models with, and has several features the Speedster lacks: a 4-speed 8880-based transmission and a full-size inline-3 engine (half of the real truck's inline-6). Since LDD does not have any engine parts, I improvised. the gray plates sticking out of the hood are the top of the engine cylinders. It also features working steering, opening doors, double-wishbone front suspension, rear live axle (a more compact version of the design used on my Model T), and a good amount of space in the bed (not taken up entirely by the rear suspension and transmission). Unfortunately, I will not be able to build this one until August, as the only Lego I have with me is my new 8880 Super Car. I have every reason to believe that every feature in this model will work when I build it, though. Notes: -Universal joints are effectively impossible to join at an angle in LDD, so they aren't connected to each other. It should be self-evident which U-joints should be connected to each other. -Part #6539 "Technic Driving Ring" comes in old gray (but not bley), which is not available in LDD. -All instances of Part #x202 "Technic, Pin Long without Friction Ridges Lengthwise" should be light gray. More LDD File