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Attika

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Everything posted by Attika

  1. Attika
    Thanks, it leaves more room for the imagination. You know, I was just about to do that. This summer I had a journey into the RC hobby. I had a few small scale kits, enjoyed building them, great fun on it's own right. Have a 1/10 4wd buggy as well. It reaches 50km/h with the upgraded brushless electronics. Fine machine with custom built body. My finger was already shaking above the mouse button to buy a traxxas trx-4. One sophisticated truck it is. Gearbox, portals, lockable diffs, bullet (and water)proof electronics apart from the servo. 500 quid. And just in time the first news came in about the new planetary hub. My thoughts shifted back to Lego again. Started to build the 8x8, etc. Finally I got here, where I've built something similar to the dream I was chasing in the RC hobby. Sbrick: Really? That is over the line now? Could be 2 IR receiver if I had a PF switch, as one motor have to be reversed. Lipo: Happened to be the same size, capacity, voltage, what is built into the Lego Lipo box. I'm sorry, I choose to save 40+ pounds on a plastic casing. Doesn't really effects the performance anyway. (It's gonna be crutial for the buggy motor version though. You gonna hate that... ) Rc tyres: The same size in lego tyres would be this one, with the well known nasty side effect: it slips on the rim. Should I glue it to be able to use? Cutted part: Yep, I did it, the other way was to use a very precise amount of random filling (tissue, or paper) to fill the 0.75 stud hole in the old cv beside the 2L axle. By cutting those axles, I've eliminated one known anomaly to test the setup as a whole. If it turned out to be useless, you never know about it. but it worked. Hopefully the common wisdom here can find a solution for the 1/4 stud problem. If so, then the concept becomes ethicaly pure and can be commonly used. Wouldn't be the first time when a flawed idea gets polished to perfection by another member.
  2. Attika
    Definitely. At the first quick look I thought it has 4 separately linked axles. The gif has dragged my attention before I had a good look on the structure.
  3. Attika
    Thank you. This one easily sweeps away the predecessors. I'm orking on the digital copy slowly but surely.
  4. Attika
    That couch climb is otherwordly. Oversized caterpillar on nitro! Nice. I had an unreal thought: What if you hinge the chassis behind the first- and at the front of the 4. axle, and spring load them. So when it reaches the "couch corner", the front of the chassis with the front axle does tilt up for an extent, somewhat guiding the rest of the chassis. Like a real caterpillar. It is only possible if no drivetrain goes through the chassis, and you have that lucky case. On a second look its not that obvious due to the tandem-like setup.
  5. Attika
    @grego18f for some reason I can't quote you. Anyway, the way I presented the steering linkage, leaves a lot for the imagination, so don't blame yourself. Have no cats, it was just a figure of speech, but got panel built boxes for darts spares etc. You must climb that ladder quickly. Bosses are excused, aren't they?
  6. Attika
    Thank you guys, sorry for the delay, had the pickup to focus on. So yes, the hubs I couldn't even dream of. And it's here. Don't forget to give it some lub. Extends the lifespan.
  7. Attika
    Thank you, indeed, the weight won't be a problem for the drivetrain anymore. (If it is built correctly) About that 4L link setup, I have no idea. Could you post a picture or something? Cheers, I'm trying my best. What a wonderful time to live. That would be handy. As I'm aging, there isn't much of a chance to learn panel based building. Yes there is, but there is a tiny chronological problem. I haven't even started to build it digitally yet.. I'm an analog developer. However in the next few weeks I'll build it in studio. Let you know when it's ready. Another fun fact: She came to the world as a swb. However that was a buggy motor setup. I've stretched it for the scale look and the climbing ability. Besides the current PF-L setup makes a long block what is placed between the front and rear cantral links. So in this setup there is only 2 studs to cut off. But could do with my buggy motored version. Thanks for the shared excitement. Thank you, about the steering: The vertical axle with the connector is attached to a 9L link, what connects to right sud hub. That 9L link is the swinging bit and it gives a good amount of suspension travel with reliable steering. So the servo contros only 1 hub, and the two hubs are connected behind the axle. But I might missed the point you raised. Let me know, please. About the tubular build: That's me, not the lack of parts. I gave my panels to the cats to play with, barely use them.... Those, who know me for long say it is recognizable. In other words: It's not ugly, it is art.
  8. Attika
    Hi there, I've developed a very annoying habit in the last few years. I randomly build pickups and other 4x4's. Even bought a real one. Anyway, the latest one is quite a biggy (sizewise) thanks to the planetary hubs. I've found a trick build them into solid axles with a practical ground clearance. This trick is going to be conroversial here. But start up with the video instead: All pics to be found here: https://bricksafe.com/pages/Attika77/ultimate-pickup In the comments under the video, noble members of our community noted, that there are parts which could solve the 1/4 stud misery. (if you don't know what is that, off you go, and whatch the video to the end! ) One of these is the 14t gear from the old diffs: I've made the attempt, but due to that collar on the bottom (top on the pic) it is too wide and puts srain on the drivline, making it hard to turn it by hand, so it is off the table unfortunatelly. So I speak for myself when I say, cuting those axles worth it. Not a rare piece, and costs 1 cent on bricklink, but only because there is no smaller value in the currency itself. In return the design prooved itself very reliable. Another "weakness" of the axle is the inperfect geometry. The wheelhubs aren't completelly vertical. There is about 1 degree tilting inside on the top. /---\ Before overdramatising this atribute, think, if you've noticed it in the video? Apart from the axles, the rest of the truck is the product of those years I've mentioned above. The essence of it is a simplest possible drivetrain: And a steering solution refined for non-rack steering: (The render is made of an older version, hence the different connector) If you don't belive your eyes, yes I choose to use 4x2 beams to form steering arms. It looks savage, but it is doing the job very well, brings ackerman geometry in the game. It does not hold the wheels rock solid of course, but in practicality it isn't noticable on the field. I've got a rack steering solution as well, but that brings the servo down A, onto the front axle (I don't do that. Ever ) B, into the mid chassis, where I don't have room for that. So we keep that for another build. Also has a working steering wheel using the rear output from the servo. ame old bevel system I've been using in most of my builds. Check the 1st episode of the pickup saga for more on that. Suspension Solid axles on a 3 link setup. It is kinda made up design, slightly inspired by the rear suspension of my Isuzu Trooper. Changing the shocks, or their hinge point on the top, gives 3 different ride height and suspension stiffness. The black, soft springs give a softer, relaxed, lower stance to it, while the dark grey shocks (known from the set 8880) are lifting the truck to a practical maximum, but still can reach full articulation. Not in all situations good to have your truck up in the sky. Like the climbing in the video. With low shock setting it made 52 degrees, but 47 "only" on big wheels and lifted shocks. The center of gravity moves with your ground clearance. That's about it, the rest is smoke-screen, like the body, and fancy doors. Oh, here is a fun fact: When it came to the seats, I realised I have 2 adjustable seats salvaged from a lorry build from about 5 years ago. Luckily they fit perfect so just made a rear bench in the same style. A non adjustable lazy style. Please feel free to ask about it, or just say something about cutting axles. I hope you find something useful here to take home with you.
  9. Attika
    Nicely done. Eyecatching details everywhere, but my favorit section is the suspension. Especially inthis scale. Amazing. About the broken cardan: You can't call a truck off-road, until you break something on it.
  10. Attika
    It's just a wannabe. This truck is just as much a tatra, like I am an NFL star.... Let's see, if monday is any better. I should say, there wasn't any. I've been trying to keep the drivetrain as simple as possible. Every additional gear connection would eat up efficiency, so both, the XL and the buggy motors were connected straight to the differencials (buggy motors with the slow output) Bottom line is: motors- differential (a 20/28 ratio) - wheelhubs 1/ 5.4. that's it. There is one thing I forgot to mention above. I've locked the diffs for the outdoor runs and for the slope test too. With open diffs, the max angle it climbed was 52 degrees With locked diffs, of course the crawling ability goes up, but the manoeuvrability goes down. I mean the turning circle grows. Just a a pro vehicle, requires (and offers) the right setup for the given task. The hubs did not show any sign of being on the edge of their capabilities. The model is close to 3 kg, I was frequently checking the hubs an the cv heads inserted. After quite extensive and- let say- intense usage there is some sign of wear, (check the left one on the picture in the original post) but knowing what they took, the lack of these signs would be more surprising. Let me highlight, the sign of wear I'm talking about is a hardly visible line in the groove of the cv head. It still works as good as new. Personally I'm very happy with these hubs. They didn't just brought me back from a longer dark age period, but in the meantime prooved themselfs very well crafted. I would say, a sensible outdoor usage does not mean any problem. Where sensible means, not to dip it into mud or sand. I've yet to find out what is their limit regarding the weight and torque they willing to take.
  11. Attika
    I guess that is the very essence of this hub. Somewhat a gamechanger. Surprisingly No part has been damaged in the process. I lost one ball joint pin though , but that happened earlier, came out from the old hub. It seems to be a very chatty topic.
  12. Attika
    Good people of Eurobricks, let me give you my first take on the planetary hubs: Please excuse me for the lenght of the video, it's meant to show the developement stage by stage. I had big expectations towards the new hubs, since they've been announced. I realised, these hubs will solve the problem of the stress on drivetrains, yet will raise a new challenge. Due to the increased torque on the wheels, the frame (chassis) and the bracing of the suspension will be the new weak link. A wanted to have a finalized rig to the date of the release of the hubs. The backbone of the design came from a five years old chassis concept, it was a non motorized chassis: To mimic the geometry of the new hub, I've used the old ones with some extension, so it can be easily swapped, when time comes: The concept of the chassis came together quite well, thanks to using techniques well practiced in my early years. But there was still a long time till the release of the new hubs. Driven by curiosity, I've planted two PF XL motors in the middle of the chassis, making them drive two axles each. One for the front axles, one for the rear ones. No additional gearing has been added, the motors were connected straight to the differentials. Of course it had to be tested, hat's the part around one minute into the video: https://youtu.be/PGQpUrOS-NQ?t=59 Came with a surprisingly satisfying result, despite the usage of the old cv's and hubs, yet it was understandably far from being a "crawler" it meant to be. Also at this point I was short of claas tyres, so I've used some similar size rc tyres on the front 4. Got the tyres eventually, still a lot of time till the hubs coming though. As the final design was gonna use 4 buggy motors, time came to make the change: Same principals, like with the XL motors: No gearing added (slow output used), 2 motors drive the front, other 2 for the rear axles. Now feeding that much buggy motors would require 4 buwizzes. Or one well sized rc lipo that can comfortably supply 2 sbricks. 4 buwizzes cost about 400-450 pounds, while the lipo comes for 30 pounds. Any question? At this stage (still no new hubs) it was an obvious, yet pretty crazy idea to hit the tarmac. So I did. That's what you see at 2:16 in the video: https://youtu.be/PGQpUrOS-NQ?t=136 I had a lot of trouble that day with the bluetooth connection, brought a head on crash int o a container. It was heart-, but no plastic breaking. Finally the hubs came by the post and the picture got full. I've also planted another servo for steering (2 in total now) Indoor durability test at 3:27 https://youtu.be/PGQpUrOS-NQ?t=207 Climbing test (60 degrees) at 4:18 https://youtu.be/PGQpUrOS-NQ?t=257 Hereby I apologize for the dark enviroment at this recording Peek on the suspension at 3:12 https://youtu.be/PGQpUrOS-NQ?t=191 Lego should not be used outdoors... ahm, okay... Outdoor test from 4:55 in the video. https://youtu.be/PGQpUrOS-NQ?t=295 I came to the verdict, that the new hubs worth their money. In a usage that abusive, you see in the video the hub-cv connection definitelly require some lubrication. I've been using silicone oil and no downside appeared so far. Here is the difference it makes: That's it so far, a little spoiler at the end of the video. Hope it's gonna catch some expert eyes...
  13. Attika
    That's just too cool to be true. Amazing design.
  14. Attika
    With respect, I bought 12 of these hubs, but not the set.(I don't like the new electronics either) All the hubs are in constant use, all together 6 rc and two PF L motors in the 3 vehicles. And they get it hard, but apart from some reasonable wear, no problem came ahead on this lot. I've started as they came, dipping the cv heads into silicone oil. Apart from one that I forgot to lubricate. The photo speaks for itself. High performance comes with a price. Lubrication. For those, who don't like lub on the parts: Well, the parts do like it. Just listen them, they speak on the language of physics. Of course there is a limit on rpm and torque they can take, it isn't a DARPA project, it is ABS. Outdoor isn't a problem, but keeping away from dust sure helps on the life expectancy as it did with any other moving part before. At this point for me, this hub is the best thing could happen to my inventory so far.
  15. Attika
    oooops. That explains a lot. My bad. I don't know why, but I had the misconception that it's motorized "there" as well. In this case I apologise for the related part my first comment and DO NOT use the planetary hubs . Would be the craziest idea ever. Your arrogance was mild and too late, you should have questioned me about my (turns out to be ridiculous) recommendation straight away. Boy, I feel stupid.
  16. Attika
    That info puts the model in a different perspective. Now I belive it can be moved by the drivetrain. It is still a massive weight though.
  17. Attika
    I agree, don't even understand why it wasn't obvious at the first place. Don't have the set, but bought a set of 8 from these hubs and joints. Knowing that they gonna get assembled into a 3 kg 8x8 straight away, driven by 4 buggy motors. Accordingly I've started with dipping the cv's into silicone wd40 before the 1st use. Let's just be real. TLG's application of this parts was in a low torque setup. If then it goes under high rpm, high torque, then no surprise, something's gonna give. Lucky us that it is the cv, not the hub. Even in the genuine RC crawlers, where all the gears and cv's made out of steel, lubrication is crutial, while the weight-rpm data is quite similar to our experimental builds. So I guess that would be news, if there wasn't any wear on them. For the record, my cv's on the two rear axles on my truck have some minor signs of wear, but nothing on the front axles. Spent about 2 hours climbing ditches and very loose, dusty slopes and I wasn't gentle. Then I've concluded, that it does no good to the hubs, nor the buggy motors, so the experiment is over. Gonna spawn some short video anyway. I'm still happy what we got from TLG. I think these hubs elevated the level of possibilities well above, than what we had before. If an outsider is reading this topic, he's gonna think that it is really hard to make us happy.
  18. Attika
    Respect! That's a lot of lego!
  19. Attika
    I'm amazed by the little details,starry roof, c'mon and that electric window is just another level. I see why the panel wheelarch had it's right to be there at the first place. The curveture was very close to the real, nevertheless changing it brought the whole car to the same accord. I can't help, but think about it's weight. Do you have a number there? Isn't it heavy for the divetrain? If so, the new hubs should solve the problem, although the chiron wheels are different again, (WHY?!) Thanks for the belly pic. It really tells about the complexity of the model. I guess it"s gonna end up in the HoF, whether you like it or not.
  20. Attika
    Why don't you buy it straight from lego? It's available in the UK. Cars, trucks, maybe a bobcat, but no planes for sure.
  21. Attika
    It might be just the photo, but it seems like the border between the colors highlights some rough edges, which were hidden while it was the same color. It's the hood, that made me say this. Couple of tiles might change the story though. Now you made me involved...
  22. Attika
    Got it, fair point. Still I like the way it looks even in this WIP stage. Can't give you any useful feedback though. With my (non existing) scale building skills, I'd already declared it "as good as it gets". So the best I can do is to wish you the best and quietly wait for the end product. Btw this electric window thing is a whole new level of madness.... in a good way. I love the idea.
  23. Attika
    What a beefy piece of art! Spectacular. There are certainly some angles it looks better from, than from others, but I admit it is a challenge and a half to make it look like and make it work like as intended. On the "look" part I think you've succeeded. More than I ever could. I belive a MOC always represents the perception of the builder about the subject, we can call it style, but it's more than that. Therefore getting and using advice from the public will always take away some of "you" from the model. For this reason: A, I say nothing about what could've been done differently (I'm sure you spent countless hours on details) B, you wont see a wip topic from me Anyway, I don't know much about bodywork, yet I'd die to see a belly pic (some say it's mandatory). Also I'm curious about the weight. I'm glad I could contribute, hope that stepper wont let you down. Looking forward to see the developement.
  24. Attika
    Cute Must drive like crazy. I'd love to see too in motion.
  25. Attika
    She's very pretty.
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