Berthil

The axles have been attached to the newly build chassis. The supporting tube chassis is still there, but less long and wider to house two steering motors to enable crab steering and more tilt. The 4-link axle attachments work great, the chassis can tilt a lot in all directions. The linked suspension has a lot travel and also works great. Where needed the links are secured in place. This makes me feel I can drop the model from 50cm and it will stay in once piece. I'll test when the wheels are on but so far very happy with the progress. Next is to make the TXT-1 drivable, for this I need a few beefy LBG steering axles which are on order. But I won't be sharing video's until the model is finished. The body should be easily detachable like in the Tamiya TXT-1, and as 'lightweight' as possible. Since all 4 allowed motor are used, I won't be making any additional functions although I had some nice ideas. But the Tamiya also does not have them so it's okay. Another possible body design has come up while taking a shower, that makes 3 in total. I'm not sure which one it will be in the end.

After many (many!) axle rebuilds I have a working version with links only, without fixed pivot points. This is not needed because it mimics the link geometry of the Tamiya TXT-1 and that works. Sideways movements is absent and there is lots of room for wheel movement. After this picture I made some more small improvements to help the sideways stability. This is a new axle design from the ground up, no re-use of existing designs and uses new components that became available recently, like the 4L links. For steering I use the older 8L gear rack. I hope with this it will 'turn on a dime'. The half stud offset from center has been corrected and actually makes the inner wheel turning radius smaller than the outer wheel, which will help making the turn radius smaller. As for power, I'm going for speed instead of crawling power. I hope the XL's will cope. Backup plan is gearing down with the red diff gear, or even the 1:5.4 hubs, but then it will be a crawler. I will be using the large Mindstorms hub, I have positive experiences with that one when it comes to weight and power. The tubes will stay, but the chassis needs to be two studs wider so needs a rebuild. The shock absorber attachment points are spot on for the axles. This opens the door for an extra steering motor for crab steering, but I'm not sure if I will do that.

You are right. I thought it would be easier to create a shaped tube chassis (not only 90 degree angles) with the new connectors. But still adding and subtracting the connector angles from the desired structure angles did not work. Compensating for length differences was also not easy. There are some small gaps and some parts have little bit of stress, but not enough to deform them. The stress actually helps in creating the rigid structure and I expect the gaps will go away when the build is on wheels and weight is added to the structure. Some gaps are also there because I used LBG frictionless pins to color match the tube chassis. Frictionless pins leave more wiggle room.

It was a long time wish for me to build a Monster Truck with a tube frame. Doing it for [TC31] seems the right time, also because of new Connector types issued lately. I took inspiration from the Tamiya TXT-1 Monster Truck, rather than trying to build a real world model. Although I started just a few days ago when the competition was announced, I was already able to build the tube chassis with a steering motor and connection points for the axles. The shock absorbers are mounted as in the Tamiya model, although a bit different because of design and space restrictions. The tubes are more or less part of the structure, so not entirely 'faux'. The suspension is working. It feels solid as a brick, but not so heavy. Next is designing the axles with power and 4 wheel steering. The motor will be on the axles. Since I like to keep everything 100% LEGO, I'm using PoweredUp. So it will not be high powered like the original Tamiya model, but more like a crawler. If there is room I want to add a manual diff lock. But another route could be using genuine black LEGO RC motors if they fit better as I have some. Not sure yet. As for the body design I was thinking of a removable and minimalistic Unimog design. I like the GT7 version but studless dark green will be out of the question. If that gets too heavy, I might revert to a smaller classic and clean two-tone pickup truck design.

Very nice build with good textures and details in a compact space!

Looks great! I was also planning to use the long shocks (for looks) on my entry for a typical monster truck look, but it hasn't shaped in my head sufficiently yet to build something and enter.

Since (real) monster trucks generally have lots of stickers/decals, maybe it should be clarified if (custom) stickers are permitted? But since it says 'no other restrictions', I guess they are permitted and up to the voters what is acceptable?

Bricklink Studio is the tool at the moment. It can load sets with parts palette (not build) and knows part availability with (Bricklink) prices. It is also possible to import parts lists as a parts palette. It can make renders and building instructions. All parts in the Pick a Brick store are available in Studio anyway. TLG is the owner of Bricklink, Bricklink Studio and of course the PaB. It can also load LDraw parts and make your own parts with the Parts Designer. I'm assuming the position of an AI here, because if you would have asked an AI, you would have had the same answer.

Here's my collection. The plan is to have an attic ready this year to display more as still a lot is in boxes. What's not in the picture is about 20 GBC machines. The classic F1 cars were designed by RoscoPC. The more than 40 modulars are all official sets, Brickative designs and my own

https://rebrickable.com/mocs/MOC-211814/Berthil/sar-queen-helicopter/#details

There is also Pybricks, which also has use cases for what you want. With Pybricks you can use the remote without a device, no phone needed. All info and coding examples on Pybricks.com

I only have worked a year for CaDa as a designer, so my remarks relate to that. I have also worked with Mould King as a designer for about 5 years, and CaDa is much more professional and honest in their approach. With the remarks from the other CaDa designers, it seems CaDa is finding a good balance between novel parts and compatibility with the LEGO Technic universe with respect for patents.

I'm a designer for CaDa, busy on my second project and the first will be published soon (not car related). In my situation, the development of custom parts by CaDa depends a lot on the input of the designer. If a designer has ideas about a new parts and it really contributes to the design, CaDa will make it. So CaDa seems to rely on the designer to come up with new parts, apart from finding solutions for patented parts. So in the case of the Audi, if @T Lego would have come up with novel ideas about a reusable grill piece, I'm pretty sure CaDa would have made it. But since a set designer is not a parts designer, and does not get compensated for bringing new parts to the table, chances are small CaDa will come with novel parts.

Thanks, good to hear you enjoyed it!

I've already added four of my own digital model files to Rebrickable, which I created for my own research. Great way to centralise these! If you have created digital files of sets, do the same!