KevinMoo

I haven’t tried high torque output yet, but I think it should have a better performance than single driveshaft at least. You are correct about the u-joints, I always forgot about that I also hate the backlash of steering for this setup, after struggling for a while I still chose this solution simply because it has a better profile look. I mean it looks cleaner from the side. As for the wheels, both axles have really great suspension travels, the front wheels nearly touches the body when cornering with the shock compressed, so larger wheels might be problematic for off-road drive.

In fact suspension works pretty well, it can keep all four wheels on the ground for most of the time, even on some rough terrains.

If you still remember the Mitsubishi Pajero that I posted about 6 months ago, you will know that there is another 4x4 MOC with similar drivetrain which I haven’t published yet. Well, the model was actually finished long ago, but the video was long overdue for some reasons. Now, finally, presenting my latest MOC: Dual-Driveshaft Pickup. Dimensions: 350 mm (L) x 150 mm (W) x 165 mm (H) Weight: 1237 g Parts count: 1660 pcs Outdoor test video (4K): The main feature of this MOC is obviously the driveshaft, so how does it work? Instead of presenting photos and explaining with lines of words, this time I made a short video to tell you all about it. This is my first time doing voiceover, as we don’t speak English in China at all, please bear with me for my accent and grammar: I’m not sure if I made myself clear enough in this video, so feel free to leave a comment. more photos: Lastly, I’ve already created building instructions, it will be available very soon. Hope you like it and stay tuned!

Alright, let me give it a try:

Hey Jim, How do you post a picture with a restricted size while the original one is actually much larger? That is very useful when someone wants to see more details and they can just click on it to see a full-size picture. I also use Flickr to host my photos, everytime I post a picture on EB, I just copy and paste the url of a 1024px wide picture, and if I click on that picture it only shows my the exact 1024px one. So how do you do that? Is that a function available only to the admin team? Thanks.

Sometimes this kind of reply frustrated me. Not only here but also on my YouTube channel. Making building instructions is a very time-consuming process. And I tried to perfect those instrctions for every new MOC I built. Up until now I still don’t know the true motivation of why am I devoting so much precious time on doing this. Perhaps I just want to leave something for this desperate world. But I’m so tired of having someone rushing me for something free of charge, something they took for granted. Even if I said "There will be instructions" I still don’t think I owe anyone anything. If someone had a slight respect for my hard work he wouldn’t be creating an account just to ask for a free instructions. I won’t make promises anymore. But there will be no instructions for this MOC anymore. That is a promise. And there will be less instructions for future MOCs. That is also a promise. Thank you for the "encouragement".

Thanks. I’m doing better. It takes time to recover. To be honest I really don’t know. This MOC is not aimed to recreate the real drivetrain.

I’ve been troubled by the vulnerability of LEGO parts on heavy models for a long time. Especially some crucial parts related to drivetrains, like universal joint, bevel gear, etc. One solution I can think of is to distribute torque by using multiple drivetrains. Instead of using 2 groups of motors driving the wheels on each side respectively, I built a live axle chassis with a dual-drivetrain system. In this way we don’t lose the benefit of differential while cornering. I actually designed 2 experimental MOCs utilizing this system. Today I’m gonna show you one of them - Mitsubishi Pajero. Bodywork is based on the very first generation of Pajero series, which was introduced in 1982. Some details have been exaggerated for a better looking, like the bull bar, rooftop, and engine hood. This MOC is built more for aesthetic purposes. Due to wheelbase concern, it’s only rear-wheel drive. Luckily both front and rear suspensions are quite responsive, which will help just a little bit on tractions when driving off-road. Each drivetrain is driven by an L Motor, rotates in opposite directions, and together they drive a single differential. I also managed to put a 2-speed linear gearbox in it. some renders to show them all: Outdoor test: I never expected it to have a great performance given the fact that it is 2-wheel drive and those 62.4mm tyres have a really bad traction. I think it is acceptable for its configuration. More photos: Upcoming New MOC This new MOC is a 4x4 model with a similar but different drivetrain. It is still an unfinished prototype, but I can’t help giving you guys a sneak peek of it. Stay tuned and enjoy

Building instructions available now. It has minor improvement compared with my previous instructions: Page numbers added Parts list added Rendered pictures are used for parts list per step for better recognition Download link: https://rebrickable.com/mocs/MOC-10677/KevinMoo/lego-technic-sherp-atv/ I didn’t take too much time reviewing the instructions so if you find any mistake just let me know.

I know about this video, but my model is based on real vehicle, not this one. My project started before this video was uploaded. Even the two models have quite a lot of differences on the exterior in terms of details, I still knew they would look similar since they were both based on the same vehicle, and I didn’t want to give up this color scheme. So I decided to give my model a distinctive drivetrain, which I believe is different from most LEGO SHERPs on YouTube. And by the way, I also believe detail matters. I really took a lot of time on making my model look great.

Thanks guys, I’m overwhelmed. Again this model will be difficult to build with detailed instructions, which makes it even harder to build with a .lxf file. Only @rm8 has it now and I don’t want to widely spread it. I have started making instructions for it, and it will be a free release in a while. So please stop sending me message asking for a .lxf file.

LDD is my main building program. At the early phase of designing a new model, I didn’t consider too much about actual building. When the prototype is about to finish, I break it into groups from the exterior all the way down to the core, so I can build it with actual parts in the reverse order. This is also the time for further refinement and optimizing building experience. Because some connections is possible in programs but impossible to build in real life. This model has a compact bodywork, and I mainly focused on functionalities, didn’t spend to much time on optimizing building experience. So even I make a detailed instructions like I always do, it still won’t be a easy model to build.

Thanks guys! Appreciated! I would very much like to create instructions for it, but given my current mental condition I’m just not sure if I have the energy to finish this time-consuming project. @rm8 I already have a .lxf file now, even though I have used the “Groups” function in LDD to break the model into smaller sections, it is still not easy to follow even for a skilled LDD user. If you want to give it a try, I can send you a copy.

Hey, Eurobricks! It’s been a long time. And for me it’s been a really tough time. Actually I’ve been suffering from anxiety disorder and OCD for a long time. It seems I can just handle it and not let it affect my life (which I did also for a long time) but things got out of control in the past few months. It’s the darkest time in my life and basically I lost interest in doing anything. God knows what I’ve been through. Luckily I got my family with me all the time. More importantly I didn’t do anything bad & stupid to myself. It is still a recovery process for me, but I think I’m well enough to pick up some unfinished LEGO projects, something I love to do, and something that will make me feel better. So today, I’m bringing you one of those projects - a LEGO version of the SHERP ATV. Parts count: 1374 pcs Weight: 1420 g Dimensions (Length x Width x Height): 232 mm x 195 mm x 178 mm / 9.13 in. x 7.68 in. x 7 in. Exterior I like this kind of compact vehicle, especially with massive tires. While building this model, I have a single goal for the exterior: full enclosure. It all started with the mudguard. I tried to use Technic parts to build the middle section but it’s nearly impossible to recreate the curves with no gaps. So sloped bricks become the best choice. To compensate a little bit on the extra “unnecessary” weight, the enclosure is also used as part of the gear housing. Drivetrain Instead of putting two identical motors on each side and making it skid-steer drive, I decided to make a drivetrain based on a subtractor. It made precise steering possible, and can be controlled one-handedly by Sbrick, which something I prefer when I drive the model while holding the camera on the other hand. This is a prototype: It’s a failed attempt. Knob wheels not only cause unsmooth power transmission, but also take the space of a 5x7 frame, which is supposed to be a sturdy housing for the lower differential. As a result, the lower diff got damaged from gear slipping after 5 minutes of test drive, the whole model couldn’t move completely. After several tests, I replace the knob wheels with 16-tooth clutch gears. it only introduces very little frictions and it’s very reliable. Here is the final version: Performance I made a short video (4K): More Details Hope you like it. Feels good to be back

That’s exactly my intention. The original model gives me a general shape of this MOC, and I didn’t want to build a precise copy.

Thanks guys, appreciated! Neither do I. That is the cost of having a live axle with a ball joint. I would prefer independent suspension, but the chassis will be much wider. If I use a pendular suspension, the driven axle needs a 1-stud offset to the ground. In this case, it seems I have no other choice.

Normally I would prefer building something really sturdy, as a result these models are always heavy and have a lot of redundant parts. This time I tried something new. Presenting my new MOC: a lightweight 6x6 pickup truck. This model is based on the Mercedes G63 AMG 6x6. It has a two-door cabin instead of the original four-door one, just to meet the definition of “Compact” in its name. It weights 1.2kg, and has around 1350 parts. I’m pretty satisfied with it given the fact that it’s a fully functional 6x6. How to make a lightweight yet reliable frame is a challenge. My solution is to have a unibody design, like most family sedans, instead of a body-on-frame structure, which commonly seen on off-road trucks. This means pillars need to help with sharing the load. The whole drivetrain is simple. All axles are live axles. Rear axles have multi-link suspensions. How to position those links is a big deal, misplacement will probably introduce unwanted wobbles. Considering the weakness of the universal joint, I didn’t put to much gear reduction into it, on the other hand, it has a relatively decent speed. Field test: With no diff lock, sometimes it struggles on rocks. But most of the time it can deal with less bumpy roads. More details: I will create instructions in a while. Enjoy.

Great performance! Such a good way to save universal joints on a heavy model, which has bothered me for a long time.

Building instructions available now. Compared to my previous instructions, it has very little improvement, mainly on sharpness and exposure adjustment of the photos. Download link: http://rebrickable.com/mocs/musenkevin/lego-technic-snowmobile-with-sbrick Enjoy!

Trust me, I have faith in my camera and my post processing skill, but I will choose the white version anyway. I personally prefer the black one, it has a much more unified overall looking, and it makes sense in real life: a black snowmobile is quite visible in white snow. Also, this model was originally designed in black color, and I didn’t consider too much about parts availability for an alternative color scheme. The white one is a simple modification of the prototype in terms of parts list. Since I don’t intend to add some custom stickers, it seems to be the best choice for public release. With some compromises (some visible light bluish grey parts).

Me too. Before I shoot the video, I applied some duct tape on all areas which would probably be exposed to snow. After about half an hour of outdoor test, the side close to the track got scratched by the studs on the track. Theoretically those studs won’t touch the Li-Po, and I didn’t notice that during indoor test. That’s probably becuase the Li-Po was not firmly fixed to the frame, and bumpy snow road makes it wobble.

Thanks Madoka. I must say I have learned so much building techniques from your MOCs. As for the cut-in-half model, that is also inspired by your Baja Trophy Truck topic on Eurobricks. Anyway, hope you don’t lose interest in building more MOCs and share with all those people who really like your works.

I used a combination of 7L gear rack and a 12-tooth gear for steering. But the gear rack’s travel is limited to 1 stud to the left or right. That is achieved by changing some parameters in the SBrick profile to prevent the Servo Motor from being damaged. The reason behind this is that the 5x7 beam gets in the way. Turning radius is acceptable, but it depends on snow condition.

EDIT: Building instructions available: HERE -------- I always wanted to build something different. Something not seen too much on EB. Introducing my latest MOC: Snowmobile With SBrick. Inspiration About two years ago I saw a video about Ski-Doo snowmobiles on YouTube. I really like the exterior design of its product and thought maybe I could build one in LEGO. But I wasn’t skilled enough to finish it at that time so the project got suspended for a long time. This finished MOC is not based on a specific model of Ski-Doo. It’s more like a combination of all my favorite parts from several models with my own thoughts blent in. Challenge: External Design Unlike most conventional wheeled vehicles, a snowmobile usually has a more complex bodywork (except for supercars). Considering its relatively small size, it’s even more difficult to recreate its aesthetics authentically. Some “illegal” connections are inevitable. Challenge: Internal Design An unconventional vehicle needs an unconventional framework. Here is a screenshot from LDD showcasing the frame. Servo Motor is used as part of the structure. Another problem goes to Power Functions. How do I stack them inside the frame? Here is a cross section view of the model: 2 L Motors geared 3:5 for propulsion. 2 pairs of LEDs utilized for headlights and taillights. Space is very limited, I have to use a pair of tweezers to tuck those cables. Performance Let’s take a look at a video: On hard snows it works fine for most of the time. Also, front suspension responds quite well. Compromises Due to aesthetics concern, Power Function parts were located at the front, which makes the model a bit front-heavy, resulting a relatively poor traction. I wouldn’t dare try testing it on soft snow... Also, the color scheme is a bummer. The white one is imperfect. Black one looks much better, but a bit dull. I still haven’t decided which color should I choose to make building instructions for... Last But Not Least This is a little off-topic talk: I just got to know about the Chinese company “LEPIN” and those dirty things they’ve done recently. As one of the very few Mainland China users on Eurobricks myself, I feel sorry for what my fellow people have done to this world. I feel sorry for Madoka. The only thing I can do is to share my original works with you guys, That’s the least I can contribute to this fantastic community. Anyway, so much for the sentiment. Hope you enjoy this MOC and stay tuned for the instructions.

Sorry for the late, building instructions available now. It is basically the same style as my previous BIs, but with some minor improvement, like red arrow with white outline. Another feature: multiple steps with separated parts list in one page. This feature involves a photo editing technique of cutting an object out of its background. It’s not a high end technique, but the process is very time consuming. It’s now on Rebrickable: http://rebrickable.com/mocs/musenkevin/lego-technic-rc-off-roader-with-sbrick Hope you like it