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Glad you like it @keymaker :) Your steering hub idea is also interesting, maybe you could try to make it in Part Designer? That's even better suited for smaller builds like my idea. What I was thinking the other day is a hub like but with steering arms like onplaced in the middle horizontally. Will post it later.

Indeed, I haven't even really thought about that. These are indeed great ones! Sounds interesting as well, do you have some illustrative use cases (renders)? What I often also find missing is a 2x2 L shaped one.

How would you use that, what would it mesh with?

I found some starting from about $100.. That's indeed pricey. And a pity that the other buttons don't work, I use them as well on my Xbox controller for additional things like gearbox.

Do you mean something like these? I've just ordered a few from webrick.com. I think they are without friction though, but I have not tried them yet.

Thanks, I think I have seen your video about it :) But maybe I have not realized it is usable with BC2 by connecting to the phone with a wire. I have been thinking in BT only..

Does that Flysky controller work with Bluetooth like a gamepad controller? What's the exact name of it? I have been wanting to try something like that..

Thanks for the first ideas :) Though I would like this too, I think it's not possible with this or this part, because the new CV joints are just too big to fit into the available space, the pinholes are in the way. It would only be possible with fixed towballs, just like in case of the planetary hub. I guess this is why it has not yet been produced. Interesting, I have been thinking about the contrary, 7L shock with 1.5 studs of travel :) That is on my list too. I think this would be too specialized, but I'll wait for your detailed description. This also sounds a bit too specialized and as you say would be part of a discontinued system.

Indeed, I totally agree. In this spirit, I have started a new thread that I have been thinking about for a while to organize our new part ideas and keep track of the potential left on the table by the technic system. Take a look and post your ideas, you surely have some :)

Since I often ramble in various threads about certain parts not being available in lego technic, for a while I have been thinking about starting this thread, kind of a collection of hypothetical parts that we'd like if they existed. Since we are talking about parts that would mostly exist virtually for now, the purpose of the thread can mainly be coming up with ideas in virtual builds, seeing the possibilities that could potentially be achieved with lego technic, how far the system could be pushed. Now the goal is not to go too far and dream about highly specialized parts that would solve one specific need and could only be used in very restricted circumstances. On the contrary, I have many part ideas in mind that would be fairly generic with many potential use cases, and would fit nicely into the technic system. In other words, they could one day be actually produced by TLG. Indeed, my secret dream is that some day somebody from TLG would wander here, see some of the ideas along with their potential benefits in builds and say, hey, let's produce this one . But even if that does not happen, we can exchange interesting building ideas, and maybe we can manufacture some of our part ideas through 3D printing or just cutting and glueing existing parts. To keep things organized here, so that the parts would be easy to browse, this first post could be used as a catalog, which I would keep editing, while all other posts could be used for discussion and proposal of new part ideas. Proposing a part idea could be done by posting some renders of it, either made with Studio Part Designer or with any CAD program. But eventually it would be great to have .part files linked to the catalog items as well so that people can download them and use them in virtual builds (for example coming up with more use cases). Also, it would be great to be able to link the use cases to the parts as well somehow. Not sure if it is possible to reference one post from another post here. @Jim and @Milan, any tips about how to keep things organized? Catalog of Parts Each of these groups link to an .io file containing these parts from which the renders were made, and also the separate part files. The images link to higher resolution versions. Liftarms and Thin Liftarms, missing sizes up to 8L (full: 4L, 6L, 8L, thin: 1L, 2L, 3L, 4L, 8L) Liftarms with Alternating Holes (7L already exists, but not yet included in Studio) (2L, 3L, 4L, 5L, 6L ,7L, 8L, 13L) L-Shaped Liftarms and O-Frames, full and thin versions (full L-beams: 2x2, 2x3, 3x4, thin L-beams: 2x2, 2x3, 3x4, thin O-frames: 3x3, 3x4, 3x5) Beams with Pins at Both Ends, (Cada has them) would be quite useful for building arbitrary sized frames (2L, 3L, 5L, 7L). Pins and Axles, mainly longer (sometimes shorter) versions of existing ones. Links with Towball Sockets, without end stops to make them usable on both sides (3L, 4L, 5L, 7L, 8L, 9L). Links with Towball Sockets Perpendicular, without end stops to make them usable on both sides (3L, 4L, 5L, 6L, 7L, 8L, 9L). Links with Pinhole Ends, in odd lengths (5L, 7L, 9L, 11L, 13L) Liftarms and Connectors with Towball Sockets, short lengths and connector style (liftarms: 2L, 3L, 4L, L-connectors: thin, wide) Wheel hubs, for smaller / tighter driven and steered axles (towballs with CV-joint, towballs with 3-pin connector, pinholes with 3-pin connector, portal) CV Joints and Universal Joints, with axles of various lengths. The universal joints might not be feasible due to too thin material. (U-joints: 2L, 3L, 2+2L, 2+3L, old type CV-joints: female 3L, male 2L, double male, new type CV-joints: female 2L, male 1.5L, male sliding 2L) Flat Panels, in systematically increasing sizes (rectangular 3x5, 3x9, 5x5, 5x7, 5x9, trapezoidal 5x7) Beams from the Alphabet (S, Z, T, H), various beam connectors (S5x10, S3x11, Z3x7, Z3x9, T3x5, H3x5) Connectors, variations on existing ones. Gears and Gear Racks, varying lengths and teeth counts (gear racks: 9L, 11L, clutch gears: 24T, 12T with pinhole, 12T with extender)

Wow, that's a great coincidence :)

This will be 15 wide, the current minimum is 17 wide, unless you go for a floating differential, which is somewhat flimsy I guess. Building a (geometrically correct) 13 wide would probably require a 4L wishbone, and a 4L double CV joint (though in principle, a the hypothesized male CV joint with a 2L axle could be cut to 1L axle length, and put into the currently existing male part with an axle hole).. But I don't think we'd get a 4L wishbone any time soon unfortunately. Soo much potential left on the table by lego by not introducing these drivetrain parts in various lengths..

Thanks for the images. Looks like a simple and neat assembly. How come that the screws from the inside that go through the 3L alternating lego connector are just exactly 2 studs apart? Is that just luck and it was spaced like that on the motor (suspicious), or is that a hole you drilled yourself just to fit the 2 stud distance? Oh, okay, on the latest renders I see it better, I realized why I thought that the lower arms would be mounted outer than the upper ones, but was mistaken.

Indeed, the steering with the Buwizz seems pretty smooth! Wonder how responsive that is if you start wiggling the steering wheel fast? When you say the 4x4 Off-Roader did not have this issue, do you mean you tested it with BC2 as well, with the same settings as this one? As a note, according to my experience with programming these PU motors (at the protocol level), the steering is nontrivial to get right, it needs some parameter adjustments or tricky ways of using the available commands of either firmware/protocol. What I found with both the Technic hub and Buwizz is basically you can either set the parameters to make it fast, powerful but jerky, or slower, (maybe weaker) but smoother. (The actual parameterization however is different in the two protocols). It seems to me that BC2 set them to slower but smoother here for Buwizz, which is better I think. However, what the parameters need to be may depend on the weight of the model as well..

Cool rebuild, you kept the spirit of the original nicely. I like the suspension especially. It's a pity that it shuts down so fast. Have you tried what happens with say 80% power? As far as I remember that helped for others with a similar gear ratio. Or just experiment with decreasing power until it does not shut down. It should definitely work at some point of the power curve.

Sounds great, thanks! :) For me, one test to differentiate the two is this: start the motor without load (just free spinning) at slow speed, say 30-40%. Using your hand, try to stop it. In PWM mode, it would be relatively easy. In speed servo mode, much harder. Also, I think in PWM mode, it's not even possible to start the motor at really slow speed, like 10% (it starts moving around 20% as far as I remember). In speed servo mode, it should be possible.

In that case, any chance of adding speed servo mode as well? I guess it should not be that difficult given all the rest like steering servo mode is already there. I'd like to use that in a next build for rock crawler's precision climbing at slow speed. BTW, is it like that for the technic hub as well? According to my testing, in the Control+ app, profiles use speed servo mode, I think that's why the Zetros for example is really good at slow speed movement. It would be good to be able to compare the performance of the two to show the advantage of the PU system.

This is exactly what I was going to suggest. Shorter version of the new CV joint would be very useful to have, but luckily that's something really easy to manufacture at home :) I think you have space to replace all of them with shortened new ones. Regarding the front diff, it is indeed probable that it will skip, but the fact that the truck has 3 axles and most pressure would probably go on the rear ones might save the day.. By the way, did you glue together some connectors there? What do you mean when you say the motors can be fine controlled with analog control? Is it just that the MouldKing system supports proportional control? Or is there something more tricky happening? By the way, how easy is it to set the steering straight? It seems a little bit fast for me for that.

Did you try to message them about it? I think the more of us does that, the more they get pressured, the more probable that they would do something about it..

Great performance on this one, and I love the rear suspension, I have also built something similar using the large turntables, though a bit more complicated with the spring attachment. I like your method of using the springs here, the 3d suspension using the towballs and links, I might give it a go to test these. You just cut some 6L links for that, right? Did you glue it into the connector? Where do you get the extra soft/hard springs from? What's a good source of compatible diameter/length springs?

This is pretty cool and interesting. I like the overall shape and the suspension is also nice. Is the suspension geometry asymmetric? Meaning upper arms longer than lower ones. If yes, what is the benefit of that? Is it stability in cornering? Can you show more pictures of how the wheels are mounted to the lego wheel hub? The motors seem to be pretty slim to fit into the rim while even the mounting lego parts seem to be inside the rim already. I have come across your Brushless buggy just a few days ago and was also fascinated by it. I immediately recognised the build style on this one being the same as that one :) I like the simple but organic shapes and the color scheme!

That is a firmware issue on the Buwizz, it will have the same problem with all apps unfortunately. The shutdowns typically happen when quickly accelerating or changing direction. In theory an app could try to add an acceleration curve to prevent some of these situations from happening, but the Buwizz has another firmware bug which makes that pretty hard to code as well.. Still, I find that with a joystick using BC2, it is easier to accelerate softly, and shutdown happens less often. Also, it seems to me that setting the motor curve to logarithmic in BC2 helped for me, speed control is smoother. @imurvai, when we select 'normal' mode for a PU motor, what is it using in the background? Simple PWM control, or speed servo control (both for PU hub and Buwizz)? BTW, great that servo steering is implemented for Buwizz, thanks a lot! Will test it soon.

Oh man this is so beautiful and nicely functional in a small package. With a few swappable attachments, these could be so great playable official sets.

I love the simple but clean chassis and suspension, and the bodywork is really smooth. The attachments also go pretty well with it, looks really complete with all of them. One question about the steering. From the servo, how much gearing does it go through? 2 (knob) gear meshes? Does that introduce lag into the steering and the return to center? I guess great precision does not matter for this one, just asking how that kind of setup functions. Are the rear axles only articulating freely?

Thanks for the references, indeed I thought it would be possible with independent suspension at larger scale, though I have never seen these older models using it. But my question is primarily using it in a live axle, smaller scale. True that a 5L suspension arm is another a possibility, but these scales are already too big for me, these are 17 wide. I'm looking for usage in 13 or 15 wide axles, where it actually makes a difference to use these as opposed to the 5 tall newer hubs in terms of ground clearance. And at those scales a driven independent suspension would not even be possible anyway. Not quite, as that is independent suspension as well, and it's huge, 21 wide. So far I have only seen one 13 wide live axle with it, but it did not have a proper differential neither a differential frame, and the steering linkage was enormously complex.