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Found 6 results

  1. Hello everyone! Since TLG released 76023, I had been waiting for affordable Technic set which includes so-called Tumbler Tires. So I jumped at 42050 Drag Racer. I also bought some extra tires separately, then revived old project which had failed three years ago. Avtoros Shaman 8x8 Building instructions: Rebrickable Weight: 2550g - 4x L motor for 8 wheel drive - 2x Servo motor for 8 wheel steering - M motor for switching steering mode (AWS and crab) - M motor for winch - 3x LED for front and rear lights - 2x SBrick powered by 2x 8878 rechargeable battery box - Independent suspension for all wheels - Working steering wheel - Openable hood, doors and roof hatch Back in 2013 As you may know, real Shaman is which can go through almost any kind of terrain. It has three steering modes and can scale 45-degree incline. On top of that it is amphibious. Seeing pictures and videos, I instantly fell in love with it.When I started the project, I was too ambitious to realize all features above. Sadly I could not build even steering mechanism while keeping all wheel drive and independent suspension. So I changed the project to building another 8x8 vehicle. It ended up as my Tatra 813 Trial Truck, but that is another story. Focus on characteristic features Two months ago, I suddenly came up with an idea that enables both normal AWS and crab steering. In the case of four-wheeler, you can do it by switching rotation of second Servo motor for rear axle. But in eight-wheeler like Shaman, you should change turning radius of second and third axle. In normal mode, the steering angle of inner two axles is smaller than outer axles. But in crab mode, all axles should be steered at the same angle. This is the basis of steering idea. I used the way of fixing/moving pivot of steering linkage. A: There are two 7L steering racks connected to 7L beams. Front rack is connected in the middle of beam, rear is one stud backwards. Both ends of beams are connected to steering arms of each axle. B: In normal mode, rear rack is fixed by 12T bevel gear. So the fixed pivot of 7L beam is its 5th pin hole. Which makes front end of beam moves twice as rear end does. That means the steering angle of 1st axle is twice as 2nd axle. C: In switching crab mode, 12T bevel gear moves one stud forward and fix front rack. Fixed pivot is 4th pin hole of beam. Which makes both ends of beams move equally. That means the steering angle of 1st axle is the same as 2nd axle. And there is one more twist. D: I put main steering rack (moved by pinion gear) on one stud forward of 7L beam's front-end (which means 9L beam’s front-end). Seeing from the pivot point, this rack is connected to farther than the point of front steering arms connected. So front steering arms always move slightly shorter than main rack does. When Servo fully turns 90 degrees, pinion gear moves the rack in one stud sideways. Steering arms move less than one stud. This was necessary for keeping CV joint (connected to steering hub) rotate smoothly even when fully steered. Challenge and compromise First of all, this MOC is NOT amphibious. It is too heavy to float. And because of driving motors of low position, chassis is not waterproof at all. So it is not recommended driving it through even shallow water pool. My aim was to achieve decent crawling capability. But I had to lower the bar because there was no room left for portal/planetary hub reduction. Without them, heavy load from 81mm tires directly goes to 12T half bevel gears. First attempt was using two XL motors geared 25:9. I put each motor for left/right side of axle. The result was unsatisfied. Even when climbing over small obstacles, bevel gears often slipped and got damaged. So I replaced them with four L motors geared 3:1. Each one drives a pair of half axles. Thanks to their good speed and smaller torque, new drivetrain proved to be more reliable. Although bevel gears were still slipping a bit, I accepted overall performance. The picture above shows two L motors for driving right side of axles. The power functions switch for changing rotation of rear Servo motor is synchronized with moving steering pivot mechanism. In crab mode, rear 4 wheels steer opposite the same direction as front wheels. As always I used few of non-Technic parts. Big roof tile was used for saving weight, curve slope parts were better choice for filling the gap. LBG axles sticking out the roof are visible indicator for steering mode. They are mechanically connected to switching mechanism. In the video you can see how they work. Instructions available at Rebrickable. Building it in red is possible by using red parts instead of white. I hope you will enjoy building!
  2. Hello everyone! This is my latest creation. ICARUS Supercar Introduction The name comes from a man who desired to fly higher using his technology. Many times I have tried to realize the speed what supercar MOC should perform. I needed “wing” called buggy motor, but all I had is a bunch of PF motors. So I connected motors together using “wax” called SBrick. Like Icarus of Greek myth, higher speed and torque may be lethal for the model itself... The result is here in the video! Weight: 1760g Propulsion: 4x PF L motor for rear wheel drive Steering: PF Servo motor Front and rear lights: 2x PF light Powered by: 2x SBrick and 2x 8878 rechargeable battery box Features: independent suspension for all wheels working steering wheel manually adjustable rear spoiler opening doors, hood, engine cover, glove box Drivetrain You may think it is not fast enough, but for me it was a relatively success. Surprisingly, gears and CV joints have never damaged or popped out even at the time of maximum acceleration. Although I had designed its drivetrain carefully, I was not sure if small bevel gears in differential withstand the load. Two 20T bevel gears of each side divide the load from differential equally. In this setting differential doesn't move back and forth easily. That means differential and 20T bevel gears hardly ever disengage. So they keep rotating smoothly even under high load. In this MOC there are three L motors (and two SBricks, two battery boxes, bunch of wiring) on the supposed location of V8 engine. So if someone build manual version with gearbox, there would be enough room for it. Body design As expected, building 1:10 scale supercar was very hard. Especially the body work. I've built one three years ago, but it was primitive MOC in every way. New MOC is heavily inspired by modern McLaren supercars. I tried to build their curved shapes using rather technic panels than flex axles. Front and rear light section happened to become different from the original mainly because of the positon of LED. Though finished model is not a copy of P1, I am happy with the result of realizing proper mid-engine proportion. Building instructions: http://rebrickable.c...icarus-supercar I hope you like it!
  3. Hello, everyone! I built 4WD off road pickup truck being inspired by the set 42029. It is not a copy of actual truck, but some details look similar to Ford Raptor and Toyota Tundra which I referred to. Weight: 1570g Features, 4 wheel drive with 3 differentials 2 XL motors for driving Servo motor for steering Working V8 engine Working front and rear LED lights via power function switch Suspensions Front: independent Rear: live axle Openable hood, doors and glove box:) Lockable tailgate Detachable bull bar and roll bar Double wishbone front suspension is the same as 42029. Which means that front axle has a differential and CV joints without portal hub reduction. They cannot handle much torque for offroad driving. So I put portal hub on rear axle. Gear ratio is 3 : 1. That can handle enough torque. This setting enables central differential to act as torque vectoring diff. Front wheels recieve 25% of torque and rear wheels recieve 75%. Thus this Truck has good offroad capability. Three differentials and pairs of CV joints works smoothly, and they did not break or snap. You can change body color, and choose the type of battery box: 8878 or 8881. Video: Building instructions and more pictures: https://plus.google....64977943/albums I hope you will like it! Edit: I forgot exhaust tailpipe in all pictures. This is the final version!
  4. Hello everyone, After finishing Corvette, I built simple RC buggy. It is lighter, faster and more agile than my preceding buggy. Weight is 590g. Total 312 parts. Video: Building instructions and more pictures:https://plus.google....64977943/albums Rebrickable:http://rebrickable.com/mocs/Madoca1977/pf-buggy-2 The performance is not as good as RC buggy motor models... But I enjoyed the buggy driving over obstacles at a good speed.
  5. Hello everyone, I just finally got done building Madoca1977 Tatra 813. What a build! I learned a lot while building this and so much went into this. This is probably my favorite of his MOCs. So I decided to do a different color and went with blue. It wasn't hard to do and instructions are easy to follow as well. I might be adding extension cab and making it 4 door but not sure yet. And or add something to the bed of the Tatra. So for the door I had to improvise on the panel fairing. Lego doesn't make it in blue for the long one. So I just 2 added 3 stud liftarms. Then for the perpendicular 3L 2 pin holes I had to do black sense Lego doesn't make blue so black seemed better. Rollcage Overall this is A+ MOC. It was very fun to build and seen the hard work that Madoca1977 put into this.
  6. madoca1977 posted video Building Instructions for his small Lego Technic Supercar which uses two Power Functions M-motors. It's his "first MOC". : :