Posted November 4, 2024Nov 4 In preparation for next years Buwizz gathering, I thought I should start working on making a trial truck, among other things. I've never finished a trial truck build before, so I expected to run into some problems this time, but I suppose I got lucky and I didn't! As the title says, I also made this model in just 1 day on the weekend, which I'm proud of. I was inspired by a trial version the Tatra 813, from HT Group Racing. Here's a video of this truck. https://www.youtube.com/watch?v=uxFjTTEWORI Details The model has independent left and right side drivelines, each side is powered by 1 PF XL motor, geared 1:1 to planetary hubs. Steering is done by a C+/PU L motor, and has more slack than I'd like. The 1st and 2nd axles steer at different ratios, but due to the slack in the steering axle the difference is negligible. The model uses Tatra suspension pivoting off the drive axle. This is obviously not ideal, as it adds unnecessary load to the drive axle, but I was feeling lazy. The gears probably should skip, but I never heard them skip once when I was driving, so I guess its okay. Here's a mock up of the second axles swing arm, made especially to please the anti-color vomit crowd ;) And finally, a video of it in action! I recorded this on the weekend, with my phone hanging off my controller, so I apologize for the shakiness of it, and the wind noise. Thanks for reading, please feel free to ask any questions! Edited November 4, 2024Nov 4 by Aurorasaurus
November 4, 2024Nov 4 It looks really good for a 1 day build! Great job with it. How many wheels steer it?
November 4, 2024Nov 4 Author 3 hours ago, bruh said: It looks really good for a 1 day build! Great job with it. How many wheels steer it? Thank you! The front 2 axles steer, so 4 wheels steer it.
November 5, 2024Nov 5 Nice! Love it! Have they already published the requirements for next year's buwizz camp? Also I can't get over the fact that it only took you a day to finish it.
November 5, 2024Nov 5 Author 30 minutes ago, NV Lego technic said: Nice! Love it! Have they already published the requirements for next year's buwizz camp? Also I can't get over the fact that it only took you a day to finish it. Thank you very much! The requirements for next year are not out afaik, but I'm working on assumptions/a previous draft version. I have enough time on my hands on the weekends to build, and sometimes I get into that flow state where everything just works out. Music helps.
November 5, 2024Nov 5 Really nice! Those PF XL look pretty fast in the video, but nevertheless, the crawling capacity is great. Keep it up! ;)
November 5, 2024Nov 5 Author 1 hour ago, Lixander said: Really nice! Those PF XL look pretty fast in the video, but nevertheless, the crawling capacity is great. Keep it up! ;) Thank you, I appreciate the support :) The XL motors are geared 1:1 to planetary hubs, and with the Buwizz they get higher voltage thus higher rpm. I actually had it geared significantly faster before, but the motors were overheating after about 10 minutes of play.
November 5, 2024Nov 5 14 minutes ago, Aurorasaurus said: The XL motors are geared 1:1 to planetary hubs, and with the Buwizz they get higher voltage thus higher rpm. I actually had it geared significantly faster before, but the motors were overheating after about 10 minutes of play. I see.......I thought it was due to the BuWizz also :) Out of curiosity.........what gearing it had before? Edited November 5, 2024Nov 5 by Lixander
November 5, 2024Nov 5 Author 10 minutes ago, Lixander said: Out of curiosity.........what gearing it had before? 28:20, 20:12. https://bricksafe.com/files/Aurorasaurus/tatra-8x8-first-edition/20241103_002720.mp4 Here's a video of it with that gearing.
November 5, 2024Nov 5 14 minutes ago, Aurorasaurus said: 28:20, 20:12. https://bricksafe.com/files/Aurorasaurus/tatra-8x8-first-edition/20241103_002720.mp4 Here's a video of it with that gearing. I see.......thanks! Much more speedy indeed.
November 6, 2024Nov 6 Author 3 hours ago, N1K0L4 said: Nice model! Do the front axles steer at different angles or are they the same? Thank you! In theory they do steer at different angles, but in reality the difference is negligible because of the slack in the steering axle and the steering racks.
November 7, 2024Nov 7 Nice little experimental model, good start for the competition :) I like the construction of the half axles. It is weird that the two PF XL motors overheated with a 28:12 up-gearing and planetaries, that is similar to the up-gearing in 42099 with weaker motors, and many other builds employed such or even more aggressive up-gearing I think. Or maybe you were pushing it 10 minutes non-stop?
November 7, 2024Nov 7 Author 2 minutes ago, gyenesvi said: Or maybe you were pushing it 10 minutes non-stop? It might have been this :> Thanks for the praise, I'm hoping to improve the sideways stability and steering play before the competition, but I think I've got time.
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