Didumos69

Hi, I made a first attempt to integrate the front and rear axles into a framework. I took the liberty to make some changes to the axles as well. I switched the gear-rack to the back-side of the front axles to keep the front side of the axles low and to leave max space for the adjustable headlights. I also form-locked the 5L levers holding the suspension arms a little better. At the back-side of the front-axles I used some T-bones to give stability and to weave the front axles to the mid-section of the chassis. I also added a gear-rack slider and removed some of the steering axles for now, as much will depend on the position of the steering wheel and HoG (do we want a HoG? @letsbuild). In the rear axles I removed some of the 11x5 frames and swapped the cross-blocks holding the suspension arms with the width-wise beams. I used different pins to attach the shocks to the suspension arms and I changed the back-side to make it more similar to the front axles. I also moved the 20t gear that meshes with the differential to the back-side. The main reason to do this is to allow for some gearbox or engine axles sticking in the front-side of the frame holding the differential. If eventually this turns out unnecessary, we can always simplify this. For the mid-section I already installed a center differential at the right height (so it doesn't stick out the bottom), which is one stud higher than the axles running underneath the front and rear differentials, hence the 8t gears in the front and rear axles. I also put in a dummy floating gearbox layout and drive-shaft, but these are just placeholders. It would be nice if @BrickbyBrickTechnic could somehow integrate the center differential in the gearbox. @IA creations, do you have a LXF-file of your engine? If not, I can make it and add it to the framework. The red pins with axle hole serve to connect the front and rear modules to the center module. I made groups for the 3 modules. Please note that nothing is definite yet. If you want to add stuff to the framework, please use this LXF-file, feel free to remove parts that conflict with your additions and share your changes here. I'll make sure to merge all changes back into the master version and upload it to the same url. In the LXF-file I inclined the suspension arms to fit the shocks. Note that the shocks are fully expanded in the renders; in real life the model will sit deeper in its suspension. Please review the LXF-file.

Well, one thing I don't understand: why did you use U-joints? Their centers don't align with the mounting points of the suspension arms. I would use CV-joints, but I can fix that too. I'm at it anyway.

I didn't see the half stud space. It must be okay the way it is. Great, I'll be integrating the two axles into a first version of a modular framework.

Didn't look at.the lxf yet, but from the picture it looks great. I like the use of double shocks which brings symmetry. Usually moving the steering pivots 1 stud away from the steering axis requires more movement in the gearrack than the 7L gearrack allows, but with the limited steering angle defined by the CV+joints, this might work out just fine. Only concern I have: do the steering links not collide with the shocks in turns?

Fantastic! So eventually the extra time has given you the opportunity to come with something even better .

I have quickly put an example drivetrain in a wheelbase of 31 studs (heart to heart). If we have a default angle for the suspension arms - and thus for the male cv-parts - of.13 degrees, then that lifts the bottom of the car by one stud. That in turn allows the longitudinal drive axle with gears and center-diff and all to run underneath the diff houses, while maintaining a ground clearance of one stud. To give an idea I have put my rugged supercar drivetrain with 4-speed gearbox layout in the example. If you want, I could.share the lxf later tonight as a reference.

I'd say the track-width / wheelbase ratio should be somewhere between the golden ratio (1.62) and 1.7 which is used for F1 cars. But for that we need to realize that track-width is actually measured from wheel-center to wheel-center. If the total width of the car without wing mirrors is 25L, than the track-width will be around 21L, but let's take into account we have slight overwidth and work with 19L. That would mean the wheel-base should be about 31L to 32L.

@Aventador2004, in my perception we have a decision. Also, the turntable-based hubs won't be a solution for the front axles at this scale. Let's move on with 25 studs width and keep the wide body kit idea in mind. EDIT: Btw, I suppose @letsbuild is referring to track-width rather than wheelbase.

If you want a working or fun Porsche, go here or here.

I arrived at the same conclusion about the width. About the turn radius, a tighter turn radius won't be possible, because of the CV-joints. Their max angle is 20 degrees. @letsbuild. I think we should take this builder feedback and the problems @Aventador2004 and @KikoTube are experiencing seriously. My suggestion would be to extend the width to 25 studs, so a normal diff layout with 2 CV-joints at.each side is possible. It doesn't really need to change the scale for we might choose to have the wheels sticking out of the body by one stud. Just my opinion.

That's what I wanted to say too.

What you want.

@Aventador2004, I think the problem is the 11x5 frames that collide with the diff.

@Aventador2004, maybe this helps:

Nice work on the axles! A floating diff house, I was already thinking that would be the only way to make it 23 studs wide. Might as well share your LXF here, so I can use it too. Btw, don't wait for me with sharing axles and engine. My idea is to tie everything together. Can't make a chassis if I don't know the axles or engine. With rear axles and engine, integrated or not, I can make a start.

Yes, but looks too small imo. Just like the steering wheel in 42077. The seats in that car are also way too small imo.

Not only will your steering links bump into the CV-joints, the CV-joints will also make a sharper angle than the wheels, making the max steering angle even less than the max angle of a CV-joint, which is no more than 20 degrees.

Yea, it's kind a bulky, but hey, this is not a smooth car . I think I know what you mean, but those parts are 3L long and it doesn't look right imo. The handles should be on the same level as the rotation point of the wheel. There is another option with thinner handles, but my favorite remains to be the middle one. Also because its stronger.

Added a Spartan dashboard and was finally able to drop in a sporty steering wheel design I had laying around. There is not much space and the 2-studs high steering wheel fits nicely. It's not functional and cannot turn. The steering axle is secured underneath the dashboard as well to fix its angle.

@letsbuild, perhaps seats could be mentioned as a separate topic, apart from the rest of the interior.

@letsbuild, well, that is quite a challenge for such a small scale! One question, do the axles need to have suspension? And differentials? Does the gearbox need a center differential? Or is that all up to the specific designers? When you have something, just share it here, real life images, Stud.io or LDD and I'll try to connect it to the other sections. To start with the framework I need to know something about the axles and the gearbox, so I wait for that. Once I have axles I can connect them temporarily. I can integrate the gearbox later if the gearbox would take more time.

I was actually quite amazed how well the framework performed. Maybe the top speed is not shocking, but it can take obstacles and climbs with such ease. On a bumpy gravel road it feels as fast as on tarmac. I think a lot has to do with it being four wheel drive and using 2 BuWizzes of course. I use LDD to design and export it to Stud.io to make renders. I like Stud.io, but it consistently uses all cpu power of my laptop.

I tested the framework with an additional weight of 750gr (making a total of 1.9Kg) and performance was still okay. If I run into problems, I have a few features I could skip: The fake V8 with M-motor and the spare wheel. For me the seats are a must-have.

Nice! The shifter looks a lot like this one...