gyenesvi

@Zerobricks I'd have a question about detailed control of the PU motors, especially positional. I understand from the previous comments that servo control will be included, however, the technic hub can control the PU motors in various modes, going beyond just +/- 180 degrees servo (aka absolute position relative to the HW zero position); it can move to any position (virtually any number of turns) relative to a preset position, while allowing to set the speed and max power to use. Is such control (including preset) going to be possible with Buwizz 3.0? Also, speed control with the technic hub is possible by setting power (unregulated), and with regulated control of speed, where the FW sets the power automatically to match the speed. Will that be possible with Buwizz? And one further question about SW. The technic hub communicates via bluetooth with an open protocol, so I can write my own controller for it. As far as I know that was not the case with Buwizz 2.0 (at least no officially published protocol, though some still managed to reverse engineer parts of it), but when I bought my Buwizz, you mentioned that you are thinking about opening up the SW. Do you have such plans for 3.0 to enable 3rd party controllers?

Technic guy is looking good inside there, nice alternate model :) It seems I have everything to build this, except for the snow :( Where are you making those ski-slopes exactly? I feel like skiing nowadays :D

Hi, I'd like to share my second C model for 42099, inspired by the recently released off-road buggy. The design goals were 1) faster speed 2) responsive and long suspension travel 3) lightweight and curved shape.The wheel hubs and the differentials perform down-gearing, so I decided to apply 3x up-gearing by a ratio of 5:3 and skip the differential to make it faster than the original. Since the differentials are not used, the small gears can be used for up-gearing with perpendicular meshing of gears, which is smoother than the parallel meshing of the 20 and 12-tooth gears. I decided to use rear wheel drive only, one motor driving each rear wheel. I managed to compact the drive-train with the following setup: For suspension, I wanted a long travel and a wider wheel base, so I tried to increase the length of the swing-arms. The rear suspension seemed simple with 7L beams, but the front suspension was more difficult, as I had to increase the length of the 6L steering arms in the set by 1 stud, so I had to apply some tricky workarounds. Furthermore, I wanted a lightweight axle with a positive caster angle, with the steering motor integrated closely to the axle. The result has more than 6 studs of ground clearance and 3 studs of travel and is quite responsive: The battery is integrated into the middle of the model to distribute the weight between the two axles, and to provide easy access from the bottom. The whole base looks like this: The bodywork proved to be the most difficult to get right, since the panels available in the model are hard to use to get the light-weight frame-like body that I wanted. After taking some inspiration from the shape of Madoca's Blue Lightning buggy, I got the hang of using the arched pieces and the flexible hoses to build the curves, and used some of the panels to finish the body with a simple roof and hood. The roof is attached very strongly to the base, so the car can be lifted by it.As the small grey seats in the original just didn't feel like a match to the overall shape and scale of the model, I gave building a custom seat a try. Luckily, the few available red pieces were just enough to make a black seat with two red stripes :) I think it adds a lot to the overall look of the model.Here are a few more pics: Finally, here's a video of it in action: Building instructions available on Rebrickable. Let me know how you like it! Cheers, Viktor

Wow. Man, you do have high expectations. That's jaw dropping, and I have never found an occasion to use that expression honestly.. Amazing machine as an introduction, great functionality and great detailed looks. It will be difficult to exceed this with your next build :D

What a great idea to build that aspect of Batman's life! Love the computer and the style of the car.

That's a great model, it's nice how well it mimics the car used as inspiration even at such a small scale, which is remarkable for an alternate build. Good reuse of the available pieces, and nice color consistency! This gave me some inspiration..

I have to say I completely agree with this. It was quite hard to sift through this thread and find out what we actually know about this set as opposed to what people would like it to be, although sometimes it's interesting to see what people miss from lego technic sets, but that may be another discussion. Btw, is there a (pinned) thread for that? Agree with this one too, especially true for technic! That's a pretty good one, looking forward to the set as well!

Amazing machine! Great suspension, nice colors, and cool video! I have also been experimenting with a similar (rear) suspension using the large turntables and the portal hubs, but could not drive the wheels in a slim enough design for the suspension to remain stiff and not bend sideways. That chain of gears in each swing-arm must generate some friction, doesn't it? I guess the key to that may be that the portal hub sticks out from the swing-arm to the side, creating space for the cv-joint. By the way, are those rims standard? The portal hubs seem to go deeper into it than to the standard tractor rims.

Thanks, hope you can back to Lego shortly.

Great to see such a suspension solution in an older model when specialized parts have not existed yet. I like the built-up wheel hub with the gear reduction and the way the steering is transferred to the front axle.

Thanks for the info on this! Does this mean that it's a good practise to start the post with the main image if I'd like to increase its chances of being featured?

Hi @Didumos69, did this project lead anywhere? I have just finished working on a similar idea and came across this thread (interesting one with those turntables as gears). However, similarly to what @Attika suggested, I worked with a less ambitious gearing, speeding up 3x with a ratio of 20:12. I put the drive to the hubs without a differential, only rear wheel drive, one XL motor for both rear wheels (so final ratio is 0.85:1). Speed is better than the original model, but as expected, the torque is pretty much lost, though it works on a flat surface. However, the hub does start to blink orange when quickly changing directions (forward-backward), so it is probably limiting the motors. Also, as I wanted to build sort of a dune buggy out of it, I created softer suspension with longer swing-arms. Here's an image of the drivetrain and the full model. You can find more info about it on Rebrickable. Let me know what you guys think!

Any feedback on this? Thanks!

I think this model looks good, but it does remind me a bit more of a Hummer. The suspension and steering is a nice build, but I miss the shock absorbers from the front, would have been more useful for alternative builds. And also, I would have been happier with a larger, more detailed Jeep. Would have definitely bought such a model.

Hi, Inspired by this model, I made a Jeep-themed alternate from 42099. It uses the same technique for suspension on both axles but with the large turntables available in that model. You can check it out here.

@Jim sure, here's the link:

Really nice model and good functionality in such a small scale!

When I come to the site, I see a list of topics on the front page started by various members. I have recently started a new topic, but it does not show up on the front page. Is this because I am a new member? It does show up in the forum where I posted though, albeit without an image. What's the right way to make my model more discoverable and get more feedback?

Hi All, I'd like to introduce my alternate model for 42099. It was inspired by the recently released Jeep Wrangler, in that it has a small turntable based suspension on both wheels. Since 42099 has the two large turntables, I thought I'd try and build a similar suspension. Also, since it has yellow-ish parts, I thought I'd build a body with Jeep-like features. Of course, not enough yellow parts for a full body, so I focused on the front (hood and the grill to be somewhat Jeep-like) and used to rest to make a consistent body at least. Building instructions are available from Rebrickable: https://rebrickable.com/mocs/MOC-62435/gyenesvi/42099-c-model-jeepy Some details I have opted for a simple suspension design by moving the turntables as close to the two axles as possible. The drivetrain is also very simple, putting the drive immediately to the differentials, resulting in slow speed but high torque on the wheels. The left and right arms holding the wheels are fixed, the whole front and rear axles are rotating and are damped by the springs. Due to the large turntables, a single pivot point is enough to hold the axles at both ends. Naturally, the size of the turntables is a bit of a problem for ground clearance (about 3.5 studs in the front and 4 studs in the back), but not as much as I expected (see below).A major challenge was to mount the steering motor on the front axle in a small space under the hood and to create a strong enough steering rig using only one side on the front of the axle (as opposed to the two-sided rig in the original model). The next challenge was to create a chassis rigid enough to hold the end points of the springs in a small pivoting mount to enable the lengthening of one side when the other one shrinks. Naturally, the arched pieces available in the model are useful for this purpose, with further reinforcements later on. The battery is placed in the middle of the chassis, providing a low center of gravity with easy access to turn it on. It is not a structural part of the model, so it can be taken out easily after removing a few body panels. Also, there's plenty of empty space inside the chassis to hide the cables.On the outside, I wanted to replicate some Jeep-like features with the few available yellow-ish panels. I decided to focus on the front, creating an arched hood with a massive front grill and lights. I wanted a consistent yellow body, so I used all yellow pieces for doors and hoods, and none were left for a roof, so I decided to build just a frame. Luckily, the curved corner pieces and the long black axles available could be pieced together for a consistent frame, that matches the style of the front grill. I think the overall proportions of the model came out quite well. I was also able to include a quite clean interior. As for actual performance on real terrain, see the video for my own off-road tests. Surprisingly, the large turntables are less often a problem in terms of ground clearance as I expected. I suspect it might be because with the fixed-arm pendular suspension, as one wheel is lifted, it also lifts the turntable half-way, so it is less likely to hit something on the ground. Also, with locked differentials it can climb quite well. Be careful however, on real rocks, it is possible to scratch the bottom of it, including the motors.The model can be controlled with the Control+ App just like to original model. More pictures Let me know what you think! Cheers

When I was a teenager, I used to build a lot. I soon realized that Technic is my thing, I liked machines with working functions, and of course cars, suspensions, motorization, remote control. Not that I had a lot of Lego (took me a while to save all my pocket money for 8880), but I built everything I could from those pieces (plus a few smaller sets). As back in those times motorization and remote control was more limited than today, we (me and a friend) invented ourselves, and added the missing electronics (like cables, LED lights, switches, power sources). It was fun :) Now 20 years later, with the help of eye-catching youtube videos I was lured back to Lego. I was impressed to see how much Technic has evolved, especially on the remote control side. Already, studless building was an entirely different level to experience. With internet sharing available, it seems much more fun to build and improve together. People build amazing things! I want to be part of this, try myself again in designing things as an adult. And of course, it's much easier to collect all the necessary bricks when you can spare some money from your adult earnings :) On my day job I am a software engineer working in Budapest. Interested in artificial intelligence and robotics. I was especially happy to see the new robot inventor set coming out :) Also, I am happy for the new powered-up system, I think they hide some interesting opportunities. Let's see how building goes with all these new possibilities! Cheers!

Let's see how it works. I can format text. Add links. Some bullet points one two two and a half three How about some centered text? And something bigger... maybe an image Wow, that's big, how can I resize it?