Zerobricks

There use to be a custom pieces used for a swingarm (32079) used in 8417:

I'd like to see a supercar with a dumb battery box to suppliment functions such as raisable suspension, foldable roof, working lights, etc... Something like 8297 was.

I highy doubt TLG would add a locking differentials to such bug models, because the small direct driven CV joints used could simply not survive the forces of a 3,5 kg car steering with locked diff. I do hope that Lambo uses the new shock absorbers from the Ducati though.

Just build it without PF motors then? Use normal technic bricks insetad of motors as placeholders for support.

We are, no worries . The 10,8V seems to be general limitation when dealing with low voltage controllers. But if you switch to a higher voltage controller, like ones for auto industry, than you have issues with low voltage control. It's hard to have the best of both worlds.

TLG did mention they plan to relase a dumb battery box, same size as PU unit with 2 outputs. So IMO that will fix that issue.

I think it's just you :) Personally I didn't notice much veering, though of course there is some play on servo and steering rack.

it took some time, but here's the video of the model. I also took the opportunity to compare the models' performance with different power and control systems - BuWizz, Sbrick and Power Functions.

I think the Osprey will use only a single motor, coupled with gearboxes to spin the blades, tilt engines, fold the landing gear, open the ramp and maybe even fold the wing as shown here:

I doubt, because than the motors can't communicate their positions back to the hub.

Thick rear tyre from the Harley Davidson, anyone?

If they had those, I'm pretty sure they'd use them on the Liebherr.

Maybe the 5th is the fake piston engine.

5 motors? Why so many? 3 should be enough for basic driving, steering and tipping? Unless there's a motor for each of the 3 axles? Also that means it has to use 2 hubs?

Pretty sure the lambo is Sian, look at the logo compared to the front lights of the real car.

Yes, I see what you mean, it's probably going to be in a smaller scale, ideally same scale as Liebherr.

I expect the dump truck to be something like the AH60: I expect it to be a 6x6 with new diffs, planetary hubs and two large actuators to tilt the bed.

Only in the steering rack and to mark and hold BuWizz bricks together. Everything else is studless.

Looks like a fun little vehicle! I think you have plenty of torque to put an even bigger wheel on it, maybe something out of the large quarter gears?

Thank for the praise. What do you mean with mechanically easy and structurally redundant? Trust me, it's not easy to make a wheel out of Lego capable of holding 30 kilograms. Regarding redundacy, the model weighs 15 kilograms and can easily carry and drive 60 kg, even up a slope. How many models can do that? And when fully loaded the frame does visibly bend and there is a very large strain on the wheels - hence greased moving parts. And there are a lot of moving parts, each ring has at least 7 gear supporting them and there are 20 rings. That's 140 gears just to support the weight, not counting the gearing from the motors.

Don't want to be rude... But build and test it throughly in real life and show us that it works. I can already tell you those axles will slide out over time unless they are fixed firmly. Also how will you get a drive to the hubs? Also, the further the sliding axle is from the wheel center, the higher the probability the whole thing just bends and not slides... While ideas are nice on paper, they don't mean much when they don't work in real life. I've seen so many people design something in LDD which simply doesn't work in real life.

If so than please do build it, I would like to see how it compares to normal independent suspension. Remember to make it driven and steered.

I disagree. Any type of suspension relying on sliding surfaces compared to a lever and pivot will have much higher friction. I see no case where the small amount of sideways motion would justify such complex suspension.

The go-kart is one my most ambitious projects. To build it, it took over 7000 Lego pieces, 32 L motors, 8 BuWizz bricks, one BuWizz app update and hundreds of man-hours. The final build, can easily drive a 60+kg person with the top speed of 4km/h. The story of the go-kart starts right after finishing the video shoot of pulling the train card with the heavy transporter. The heavy transporter showed me that Lego pieces have the needed strength to carry and transport the weight of a person, albeit in that case quite slowly. So I got an idea to create a carrier which would use a higher amount of motors than the heavy transporter and have a higher speed. Unlike the 24 small wheels the transporter used, the new model would only use 4 wheels based on the Technic Gear rack 11 x 11 Curved. Work first began on the wheels. They had to be capable of carrying a total weight of around 60 kilograms. When dealing with such heavy weights and forces, the only way to succeed is to distribute the load over a high amount of bricks. In this case the wheels were designed with multiple parallel rings, each carrying part of the weight: The rings would be stacked onto each other to form the finished wheel: Each wheel is powered by a total of 8 L motors through a gearbox. The original idea was to gear the 8 L motors up 3x times using a combination of 24 and 8 tooth gears. But after testing the wheels I soon realized that we will need a lower gear ratio, so a combination of 20 and 12 tooth gears was used to gear up the motors by a factor of 1,67. The resulting gearing gave each wheel a top speed of around 4 km/h The wheels were further optimized during testing to use clutch 20 tooth gears as the main weight-bearing wheels instead of the original 12 tooth gears. This change helped the wheels to spin more even and it allowed the load-carrying axle to be stationary, reducing wear and tear. Since each wheel used a total of 8 L motors, a total of two BuWizz bricks were needed to power each wheel. With the wheels finished, it was time to build the frame of the go-kart. The frame is based on two main pieces, a 1x15 Technic beam and 7x5 Technic frame. The 7x5 frames are crucial to the rigidity of the frame, while the beams connect them all together. Of course there were also thousands of pins used to attach everything together. With the help of Lego Digital Designer I created the first sketch of the go-kart's frame: With the virtual model created, I now had an estimate of the needed parts. With that information, I started looking for the cheapest deals on Bricklink, updating the digital model was I got along. Red beams turned out to be the cheapest solution, and we ended up ordering around 850 of them. Total number of parts ended up at around 7000-8000 with over half of them being pins. Once the ordered parts were received, it was time to build the massive model, which took several days: During the assembly process, the frame and model have been further improved and reinforced in order to carry my own weight without excessive bending. The wheel rims were covered with adhesive window rubber insulation to add grip: The rear axle was flipped 90 degrees in order to increase its rigidity and the whole kart was split into several modules for easy assembly and maintenance. In fact the whole cart can be taken apart to a couple of modules and assembled in less than 10 minutes. A couple of custom stickers and the Go-Cart was finished: With all the mechanical problems solved, it was time to turn attention to the control of the model. Since each wheel uses a total of 2 BuWizz bricks, the whole model used a total of 8 BuWizz bricks. This resulted in a problem with control, since Android based phones can connect to a maximum of 7 Bluetooth devices at once. We decided to try to use an Apple based device to see if we can connect to 8 BuWizz bricks at once. There were no issues, so a simple Iphone 5 was chosen for main controller. The phone was integrated into the steering wheel: The control device also had to compensate for the difference of motor speeds when taking a corner. Due to the load on the wheels, a simple sharp turn could cause them to fail if we would not slow the inner wheels down when turning. We needed a way for the BuWizz app to know that the wheels are being turned. This is where I came up with the idea to use the phone's own internal accelometer to detect the steering position. Since the phone turns along with the steering wheel, it always knows in which position of the steering wheel. We asked our app developer to add a simple gyroscopic command to the app, which we then used as an input for our tracked steer mixer. I experimented with different mixer steering ratios and in the end settling with the factor 0,1. The finished model was also duplicated in LDD, where the final piece count is around 7500 bricks: Now that our go-cart was fully functional, it was time to head outside to give it a final test run in the real world and the record the following video: Few weeks later the Go-kart was also driven by kids on the Brick Planet exhibition: All the long hours designing in LDD, building, rebuilding, fixing, optimizing, the blood, sweat and tears, they were all worth it when you see how happy kids are driving the Go-kart!

Great presentatiom, but I think there's a mix up between real and fake 3/4, since real one allows the bar to pass - has internal round shape.