Zerobricks

Good idea, suspension and gearboxes is where most people start when making supercars or even offroaders. I will post some of my ideas shortly.

No, the front ball joint carries steering to the steering wheel.

The Porsche's original gearbox is powered by rear axle. But both axles have 2XL motors, one per wheel.

Thank you. What do you mean with gear ratio?

The small one with rdiges that extend across the whole width.

XL will not break the new version of the 8 tooth gear.

Here's a picture of LDD version of the model made in developer mode with collisions disabled. Wheels are not correct, but they sure look awesome.

But so is the axle that is attached to it in the opposite direction.

I have PP tyres, they are smaller and dont look as good.

Sorry, no it does not have it. None of the sets after 2000 have it.

I decided to open a seperate topic for this beast. Inspired by Letsbuild's idea to crawlify a Lego set, i decided to go full crazy and try to upgrade the biggest, heaviest and most orange set to date, Porsche 911 GT3 RS. First thing I built was the front axle, which uses the H frame as a placeholder for bewel gear, so there it no possible way of them to slip: Those with sharp eyes may notice the gears are not aligned, this was done in LDD development mode, more info soon The drive than goes directly to portal hubs with 1:3 gear ratio, giving the model 1:5 gear ratio on each wheel. Front axle also has a servo motor which steers the wheels and powers the Porsche's original steering wheel via a ball joint Rear axle powers the Porsche's gearbox via a couple of clutch gears in order to allow different motor speeds when steering or skid steering - Yes, this 4 kilogram heavy model can even skid steer thanks to its independent motor control. Here is the end result As with the original set, I kept the rear axle 2 studs wider than the front: For suspension I used 4 hard springs, which are hald compressed thanks to the model's immense weight. Due to the porsche's wide chassis springs are quite far apart, so the flex angle is not really big, but on the other hand that makes the model much more stable. Performance wise the crawler works very good, despite its massive weight, so far I had no broke U joints or gears and it has enough torque to skid its wheels on hard surface. Expect more pictures soon and a video soon.

Or make your own portal hubs, which may end up even more compact. But the wheels will be held on by axle only without the pins.

Thank you for the very pozitive feedback everyone. I feel like I'm back in the game. Expect more stuff like this soon. (hint, hint crawlify your set topic)

Impressive. A good example of how not to judge a book by its cover. The way the doors open, the foldable tent-roof thing and the small system details sure convinced me. I will get one, if not two.

You guys asked for it: Powered by 4 XL motors and a servo. Original steering and gearbox are also connected to the chassis, so they work too. More info posted in seperate topic soon.

It took me 2 full days of modifying and I managed to crawlify a set... But I do not want to post pisctures because I am affraid of discouraging you guys...

Wait, for which set are we doing this challenge?

Hi everyone This is a model i built a while ago, but only now had the time and eqiupment to showcase. I was asked to build a Buwizz showcase model for a toy fair in Boogna, italy. After some thought I decided to combine the rare dark blue panels from 41999 with tracks and a couple of RC motors. The finished model has following features: 2 RC models for drive Spring supported pendular suspension Two working fake V8 engines - hence the V16 Rollcage reinforced interrior with 4 seats Openable 70's muscle car style openable bodywork A working winch LED bar powereed by a total of 10 LEDs So lets start with a 360 view of the model: As you can see the body is inspired by 70's muscle car styling with large chromed grill Detailed view of the grill with the cute bunny: Lifting up the body exposes the internal rollcage and the two massive engines: Further the rollcage can be lifted by pulling out the two red pins, showing the 4 identical seats, making this a perfect family car The two V8's are powered by the RC motor's faster output: The power passes via cardan axles under the seats and up the gears: In case the model ever gets stuck there is also a functional winch powered by an M motor via 1:5 gearing ratio: The suspension is highly flexible: And here is the most important photo of any technic model : And to finish up with a bang here's a video of the Ripster in action: A quick summary of my thoughts regarding this model: Because the tracks are powered by the RC motors directly this is THE fastest tracked model I ever had the pleasure of building. But that speed comes with a price, the model has problems steering on spot on surfaces with high friction such as carpets. Sudden acceleration on such surfaces with quite a heavy model like this (1,5 kg) can cause problems with tracks coming apart. For that reason this is a perfect vehicle for smooth surfaces or ice. It is also very good at drifting, though it takes a lot of coordination to control a tracked vehicle like this. Suspension is extremely durable, the wheels were originally held with frictionless pins, but that proved insufficient, so they were replaced by axles 5 with stops. After that upgrade I had zero issues with suspension and it proved to be very flexible, yet reliable. Biggest problem with the model is the cosmetic stuff, the V8 chains tend to slide off after a while at such high RPMs, the bunny likes to jump into oblivion and the front grill can fall apart when crashing into stuff. Oh and one last thing, ITS LOUD. Driving this on my floor sounds like machine gun fire, so I hope my neighbours wont file a complaint . At the end of the day even with its positives and negatives its a very fun model to drive around and that is all that matters.

Well done everyone and congratulations to the winners. Even though I was 4th (yet again) I really enjoyed this competition, it allowed me ti imporve my mecanum wheels and to try new things. Cant wait for more competitions

The old 8880 wheels turn okay-ish, there is of course some friction, but they do spin under the bike's weight. We will see what I could use for engine, but it probably wont be an efficient solution.

Thanks guys, I only wish there was a simple way to transfer power from such wheels to a fake engine or such.

Hi guys I bought several of the 8886 PF extension cables and noticed my motors would not work on them. They all use the newer version of the connector with rounded cable gland. The problem is, that the metal tabs seem to have less bracing, so they do not contact the motor as well as the old version. Here's a video of the issue. Anyone else experiencing the same problem? I will also send Lego costumer support a message regarding this issue.

Hope you manage to get it going fast enough to be stable. Good luck!

Sounds like a good challenge, count me in

I wanted to build something special for the rebrick LEGO Technic BMW motorcycle competition. The first idea I got was to try to make hubless wheels. After trying several wheel sizes approaches and techniques I decided to use the old 8880 soft tyres with a combiantion of 8 135 degree connectors and a nunch of smaller internal wheels: In order to make the bike look low and sleek I decided to ditch the normal handlebar steering system for a multi-link one, which gave the bike its distinctive front shape: Belly photo of the multilink steering system - notice the two 6L steering links which allow for suspension movement: Of course a bike like this also needs suspension which is hidden in the frame: And finally the bike was covered finished in blue trim, with BMW color detail in the front: And of course I just had to include the special 3L beam found in this year's sets: And here's a video to finish it all up: In the end of the day I am very proud of myself for building something out of the box, I learned how to make smoothly rotating hubless wheels and I managed to build something trully futuristic with all the weird angles, shapes and functions. If anyone is interested in rebuilding this beauty, there is also an LXF file of the model without the tyres here: BMW U2-P1A