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Sorry, no bad jokes about French cars. Regarding the gearbox - it's a tough dilema. I remember discussing Nico's 2CV with my kid ad we were absolutely blown away by comparing radar pictures of actual 2CV with the Nico's one. And DS is a bit further down the iconic lane. But I would say leave the gearbox as is. The function is in my opinion of greater importance than the proper positioning.

Wow, this is a nice task. I am looking forward to see the final product (I like Nico's 2CV). Of course DS could be driven with only 3 wheels. It's a French car - they do tend to occasionally lose a part or two. (Don't get mi wrong - I have a French car and I kind of like it:-)

@seasider: if they would scale down the speed, this would mean that from 46 km/h goes to 5.75 km/h, which is 1,6 m/s. However, this speed can be achieved by fall of 13 cm (if my math is correct). And I don't think that a drop from 13 cm would cause any brick to break (as shown in video). Therefore I think that they test at 46 km/h, which is 368 km/h at life scale.

If you just have started again with Technic, then majority of your money should/would go to new sets. Hence PF IR is optimal at this stage, since for sure you'll come across one or two in sets. After you'll get your taste developed, you can go into BT controllers if necessary. I personally use sBrick and BuWizz mostly on fast vehicles, since it makes a lot sense. On slower machines the control speed and reliability is not such an issue.

If I get it correctly, the Porsche speed was 46 km/h. This in 1:8 scale would approximately yield to 368 km/h at 1:1 scale(?). I can just say that Lego bricks hold it good.

I am sorry about change in the rules. However your Groot seems to suffer from early stage of Parkinson disease.

I also thought it is real. Some years ago I have seen ZBLj's Proof-of-Design hovercraft with old fas spinning 9V motor and some hovercraft skirt in a form of plastic foil (purist could use Lego own wrapping plastic bags). Unfortunately the fan was not capable enough to lift the battery box but I am sure it could be done, perhaps with some buggy motors etc. Nevertheless, I like your hovercraft, since it hits at the proper way of operation. And it's nicely looking. Thanks.

This is very exciting creation. It's quite inspiring. I also like that you have published instructions of previous model on YouTube. Thanks!

Wow. Very good. I like this technic/work-horse look of the plane. You can see the amount of functions trying to jump out. It would be super cool to see just the naked fuselage without panels. I think it is very cool how much mechanism you have in that small space. I would like to see more, all this gear-pr0n:-)

I also have limited experiences with tutorial. I am not sure if there are exact numbers or some random ones that you should punch in. However, if you want to be sure if your encoders within the motors function okay, perhaps you could run them for 360°. If the motor (not the robot) does the full circle, than the motors are ok. In that case there could be differences in wheel size, gearing (if there is one) or you have to figure out the number yourself. I hope this helps.

Dear Sir, Thank you for this. The Spirograph v4 was quite a hit with kids but I am sure this will be even bigger. The combinations of gearing are incredible. I will have tough time building it but it will be great showing it to kids. Thanks for the effort!!

@philo: being used to normal batteries this came as a bit surprise. But it is a nice feature.

I have also tested/testing Buwizz. On the hardware side, it's very good, the box is sturdy (it went flying unintentionally but survived without a problem). The box seem a bit light, at least compared with regular battery box with 6 AA NiMH batteries. I was pleasantly surprised regarding clutch power. It's quite good. No problems with the PF connectors on the top but also no problems with the connections at the bottom. I have tested with several phones ranging from Android 4.4 to Android 6. The app (v1.02) is quite rudimentary and still lacks of some functions as Magical (=MajklSpajkl) have mentioned. I do prefer the first version of the app (v1.0), which is straight forward without any pictures. But that is just a matter of taste. However I cannot elaborate more about the app since it will be upgraded (I think that app for iOS is more advanced at the moment). I had a bit more problems due to my strange choice of phones. But with the help of Roni, we figured it out and I have tried different machines, some 4WD's, crawlers and even trucks. The 3 speeds button is working quite okay. I was surprised while in lowest speed, the car still had enough torque (I was driving the machine on the grass). On maximum speed, it was quite fast. I can imagine that with some MOCs, the strength limits of Lego plastic could be easily achieved. I have emptied the battery flat out. At the time, the battery just cuts-off without a warning. However, even short time before that it is capable to produce a lot of power. Regarding power: I missused Buwizz to run the Lego pneumatic compressor with 4 large pneumatic pumps (I have not removed the springs). I have used one XL motor, however the AA battery box could not provide enough juice to power it (it stalled), however BuWizz was more successful. Of course it drained the batteries quite soon. I quite like microUSB connector to quickly recharge the BuWizz on my phone's charger. The BuWizz was tested with my 9-year old kid and had no problem connecting it. And driving the car over the phone was of course pure joy for him (a bit less for me since he was speeding).

I like GBCs and always on a hunt for new builds and instructions. However, I think the approach with the tab as Captainowie showed is quite good enough to view only GBC topics.

Wow guys, you are picking up the speed! This is great. But next time you could overtake Akiyuki and publish instructions before he publishes his video. Thanks for the effort.

I am glad you've found a solution. Is it working okay? At least for me a working Rubik's cube solver is just magical. Not sure why, perhaps because I used to solve the cube myself when I was way younger. But it took me ages (like 5 minutes) in today' standards. JP Brown was the first one who build a Rubik's cube solver out of Lego that I am aware of. If there is somebody with more information, please share. His page is quite old, latest addition to the page is 10 years old.

I've seen JP Brown's version of Cube Solver some years ago and I was blown away. However I never got to build it, since it looks quite complicated. I have built two versions of MindCuber: NXT2.0 and EV3 Educational and they both worked okay. I only found some problems with the side light, where it for sure interferes with sensors reading. I've shown both of the models to kids at our LUG events and they mainly survived the enthusiasm. After 6 hours the mechanics start to wear off and some reinforcing is needed. Regarding light readings, check if the sensor in reading mode is in right position. If it is, perhaps you can check values of the reading. This will give you some clues, where the problem is. I have used both ordinary cube bought at a supermarket and original Rubik's cube. I got the same results, some misreading but mostly accurate. But maybe I was just lucky. Good luck!

I like GBC and Mindstorms and I try to build some smaller contraptions by myself. However, when I come accross big and complicated stuff, my knowledge, available time and stamina just ain't enough. In that case I use instructions to learn and to have fun with the finished product. Therefore, I am quite pleased that there are you guys building this and providing instructions and everything. It's just incredible. I have incredible respect for you. So thanks a lot!!

Please don't be discouraged by the lack of the response. Probably we (i.e. GBC freaks) are all in shock. I do wish you all the best. Now I am going away before I get all mushy inside.

This is quite incredible. Congrats on your quest! It's quite a machine you have engineered. But I also liked your description, which shows us a glimpse of the problems you came by and the solutions to them. I would not mind reading a full article about this.

Great Scott!! This is quite amazing. I know that the accuracy is more related to the pendulum, but to use plastic gears to get everything working is just great. I think I'll give it a try together with my son. He'll for sure learn quite a bit about mechanics.

Gosh, this tread just knocked my socks off. Thanks everybody who is atively contributing to the cause.

@DrJB: thanks for pointing to Doctor-brick.de, there are some very nice models there. The Zig zag LDD file was made by GBCPeter: http://www.brickshel...zag_akiyuky.lxf

Gosh, I really don't know what to say. This is magnificent. Thank you all - Akiyuki, TheRebricker and Blakbird! For a long time I was wondering if I'll ever build something like this. I am not very good at building new Lego devices. I've been trying to get two GBC moduls of my own operational during the weekend but the Bricks Gods do not want me. So I just startet to build this. The videos have a nice pace and it seems like contemplating browsing through the build. Thanks!

Sorry for bumping this topic but recently I've got time to try out digital Building instructions on 42022 with my 6-year old son. He is quite capable of following instructions on paper so I give it a go. The first problem was, that I have android tablets (Asus transformer and Samsung Note) and none od them was supported by the default. But I nevertheless tried to installed the application and I must say it works well on both tablets despite not being supported. Well, there was just a bit difference in the length of technic beams on the screen (1:1 view was not quite 1:1) but I guess this is the problem of different screen sizes and resolutions android has. Instructions are quite good. Sometimes I also build with tablet (I do download instructions in pdf format) due to limited space. However I was pleasantly surprised with details (there was easy to spot difference between black and dark bluish gray, which sometimes is not obvious in pdf). However, it seems that all the choices of model manipulation (zoom and rotation) give our kid a bit of a problem. He was always double checking the instructions, playing with the tablet etc. My estimate is, that building was hence slower. Perhaps this is just a glitch but it seems that to many choices can make building a bit oversimplified - hence the double checking. Regarding this, I remember James May saying about Meccano instructions - that in his old days they came with some deliberate mistakes to make children think about what they are building. It is nice when with regular instructions I have to think about design to see what goes where. And I am very happy when I get it right (an frustrated on other occasions). With digital instructions its almost impossible to miss something.