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Here's a new project I'm working on. It is a model of the JCB Fastrac Two. https://www.autocar.co.uk/car-news/features/christmas-road-test-worlds-fastest-tractor A modified JCB Fastrac tractor, the JCB Fastrac Two is the fastest tractor in the world, and can reach 150mph. My model will feature drive, steering, an inline-6 fake engine, and a working steering wheel. The model uses the Control+ system and features 2 C+ L motors for drive and a large angular motor (from the 42114 set) for steering. So far, I have done some initial modeling in Stud.io. I've modeled the drivetrain and the front axle, and the C+ hub sits between them near the bottom for easy battery access. Photos: -
This thing - called world fastest tractor. World's Fastest Tractor (jcb.com) Was considering also large scale, but stopped for a moment on some midsize. At the end it has also some functions - fake engine, differential, HOG steering, openable hood. Also on original there are not much function - mainly high speed. Disclaimer - inside pics was better then in outside somehow (maybe because of winter) Fake engine - four working cylinders, but it is six studs long, so two really fake cylinders. In fact, to be in scale, this kind of fake engine with 6 working cylinders, would fit with Volvo loader wheels. Engine is at slight angle, just like on original This is how HOG steering crosses drive axle (red) Bonnet could have been better, but there is no 9x3 curved panel or similar. I tried idea with some angled connectors, but this straight solution seemed better. Also it would been good to have those rear fenders in yellow. They are available, but I don't have them. Rebrickable showed, that average price is 30EUR, but in fact, it appeared, that they are some few euros on bricklink. By form they are almost perfect. Maybe will continue with large scale on Volvo wheels. But who knows, when that will happen.
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It's time to show something agricultural. This time it will be a rather unusual JCB Fastrac 3185 tractor and an Oehler ZDK 180 trailer. The tractor model has been on my shelf for almost two years, so it's time to show it. For comparison, a photo of the original: JCB Fastrac 3185 I must admit that the Fastrac series are some of my favorite tractors. I remember being fascinated by them in agricultural newspapers as a child. What impressed me the most was the fact that they could accelerate up to 80 km/h. These tractors are loved or hated mainly because of their appearance. The 3185 is definitely my favorite. I started building it when it was already known that agricultural tires with a diameter of 81 mm would appear with the 42129 set. The frame was built quite quickly and is significantly different from my previous tractors. I removed the front three point hitch and added a front pendular suspension. The tractor is powered by an L-motor, turns using a servo-motor, and the lift and PTO operate two M-motors. Everything controlled by Sbrick. Then I started building the cabin, which has a rather specific shape. I managed to reproduce it quite well and I am fully satisfied with it. The cabin, of course, has an equipped interior with two seats. The biggest problem I had was with the design of the tractor's hood. It has a specific arch at the front with gille and thin frames on the sides. First, I made it with a sticker, but during one of the exhibitions I came up with the idea to use rounded 1x2 plates. It was a good decision. From the beginning, I didn't plan on making a building manual for it due to the complicated shape of the cabin. I finally changed my mind. This required further corrections, but they were implemented quite efficiently. My reluctance to follow the instructions was also caused by the printed fenders that @SaperPL made for me. Not wanting to cause problems for people who would buy the instructions, I built equivalents from Lego, which increased the number of elements by 130 bricks. The final effect, especially after using the stickers, is great and I must admit that it's probably my favorite tractor now :D OEHLER ZDK 180 Such a long delay in the publication of Fastrac was also caused by the lack of a machine to complete the set. I wanted to build a construction trailer, but I decided that it would be quite similar to my previous Krampe BigBody 550. I did not have traditional trailers in my collection. I kept thinking about an unusual color that would contrast nicely with the yellow tractor. I chose OEHLER ZDK 180. I decided to build the box with 23405 panels, which imitate the sides of the dump box well. Surprisingly, the dimensions of these elements matched the dimensions of the model quite well. The dump box had to be reinforced, of course, otherwise the load would burst it from the inside. I used additional strips so that it is now very stable. The visual effect well reflects the appearance of a real trailer. The dark turquise color is slightly different from the one used in Oehler trailers, and in the photos it looks much bluer than in reality. The dump box also has a side locking mechanism that works like in a real machine. The difference is double-side tipping.The real trailer box tilts in three directions. At the beginning of the construction process it also tilted backwards, but the use of a medium linear actuator made the whole thing very unstable. Finally, the box is lifted by two small linear actuators powered by the M-motor. The maximum load I tested was 4.5 kg. I must admit that this is quite an impressive result. Another interesting fact is that I used 67.8x27 tires, which are a bit larger than they should be, but because they are wider than the 62.4 mm tires, they significantly improve the overall appearance of the model. JCB Fastrac 3185 building instructions: https://reb.li/m/169365 Oehler ZDK 180 building instructions: https://reb.li/m/169574 Photo gallery and video presenting all the models' functions: -
Model of a modified JCB Fastrac. Features drive, steering with working steering wheel, 6-cylinder engine, opening hood, and custom stickers. Functions/features: Drive Steering Working steering wheel 6-cylinder engine Opening hood Instructions available on Rebrickable: https://rebrickable.com/mocs/MOC-118212/JLiu15/jcb-fastrac-two/#details After publishing instructions for two of my MOCs, I realized that both of them would cost a lot to build if you didn't have all the pieces. My Azure Racer XL, while simple with just over 600 pieces, had the expensive and hard-to-find RC motors. My large New Flyer XD60 Articulated Bus model mostly used currently available pieces, but 5000 pieces is still a lot. Furthermore, both models used third-party electronics: the Azure Racer XL used BuWizz and the articulated bus used SBrick. Because of this, I wanted to build a medium-sized MOC that is not only functional, but can be built without potentially spending a ton of money on LEGO pieces. I thought of making a model of the JCB Fastrac tractor, but then I found something that looked even cooler: the JCB Fastrac Two. I originally started designing the model in Stud.io back in February, but got bored of it after a few days. I did not make any updates to the model until May, which was when I got into designing the bodywork. I finished the digital model in early June, and built the physical model over the past few weeks. Thanks to already having worked on the instructions along the way, I was able to simply follow the instructions I made while building the physical model, allowing me to finish this model much faster than some of my other ones. Some information on the JCB Fastrac Two: it is a modified JCB Fastrac tractor that is built purely for speed. It is the world's fastest tractor, and more information on the original JCB Fastrac Two can be found in this video. While the real-life JCB Fastrac Two is the world's fastest tractor, my model was not intended to break any LEGO speed records. I decided to use the Control+ system for this model, as the system is widely available and I can keep the model 100% LEGO. The model is powered by two Control+ L motors sitting above the rear axle. The chassis essentially consists of two halves with the hub in between, with the whole structure reinforced with longitudinal beams. The placement of the hub allows for easy battery access, and the hub is turned on via a hidden switch by the driver's seat. Steering is controlled by a Control+ Large Angular Motor (the one from the 42114 set). I preferred it over using a L motor as it has more torque, and it just feels more suited for steering operations to me. The rack and pinion setup is placed sideways, with transverse reinforcement for the rack. My initial setup was prone to skipping at either end of rack's range of movement, but moving the transverse support closer helped eliminate this skipping. Additional gearing from the steering mechanism connects it to a working steering wheel in the cabin, and the drive motors are connected to a 6-cylinder fake engine in the front. My plan was for this MOC to be a primarily Technic build, with System pieces used where needed. However, the model still saw a fair amount of System detailing, and it has nearly 90 half pins (not including the new friction ones), which goes to show the amount of System pieces that went in to add additional detailing. The cabin area of the bodywork was largely straightforward, with most pieces connected at right angles with an occasional slanted or curved section. Modeling the hood and fenders were more challenging, as these parts have much more of a curvature. While I'm not totally satisfied with how some of these parts turned out, I was able to model the design digitally before physically building it thanks to Stud.io which eliminated the need for trial and error. After finishing the build, I designed custom stickers for the model which were printed on opaque sticker paper at Staples. The paper is very good quality (beats the label paper I started out making stickers with), and is easy to apply to LEGO pieces. As for the performance and functionality, the model is decently fast for a Control+ model. It isn't crazy fast (e.g. RC motor/BuWizz speeds), but is fast enough while not straining the drive motors. And while there are only two independent controls (drive and steering), I feel that the fake engine and working steering wheel really gave the model something extra. Mini piston engines (the ones made with half bushes) are always satisfying to watch, and the rattling noise when running is pretty nice too. I feel that there could've been a better way to open the hood that did not require a prop (e.g. a locking linkage), but there wasn't as much space to install a linkage mechanism especially with the fake engine occupying the space right under the hood. Overall, I'm pretty satisfied with this project. Although I quickly got bored of this project after starting the design in February, my interest quickly rebounded after I got back to working on the instructions in May. Some parts could've been better, such as the hood and fenders, and I feel that the model could've gone a little faster. Still, the model isn't exactly light, and achieving a higher speed probably would mean compromising on some parts of the build. Video: Photos:
