Search the Community
Showing results for tags 'Magnum'.
Found 1 result
-
Hello! Two years after I posted my third tiny RC, the Mercedes Citaro ( ) I made my fourth one! It’s the replica of one of the most specific trucks. I’m sure you have already realised it on the small picture, before you opened its mocpage! The type of it is Renault Magnum. The idea of building this truck at this scale and with this brand method is quite old, but other projects and university stole the time. So I’m very happy, that it’s ready! Hope you like it, too! The length of the whole vehicle is 45 studs. The width of the tractor is 6,4 studs (16 plates), the width of the trailer is 6,6 studs (16,5 plates) without mirrors and other design elements. The scale is minifig scale. It has the two compulsory functions of a tiny RC, propulsion and steering. It contains approximately 820 pieces. The video: Because of two developments, the motions of the truck are absolutely lifelike. It’s possible to solve almost all extreme situations, which happen with trucks in real life! You may realised that the trailer is not exactly horizontal. If both axles are fixed, the front wheels don’t touch the ground. The weight of the trailer is on the front axle, the other axle and the wheels on it are only decorations. It was a real challenge to figure out the front! I used almost every direction. I'm very proud of the result Technical detailes: You may remember my yellow Daf truck, the grille of it is my body icon everywhere ( ). The Renault is similar to that, everything is in the semi-trailer, but it has two very important differences (the two developments). Propulsion The motor drove the wheels of the trailer at the Daf. It meant that the truck couldn’t move, the trailer couldn’t push the tractor if the angle of the trailer and the tractor was too close to 90 degrees. In this truck the rear wheels of the tractor are the driven wheels. You can see the method on the pictures, how I brought the spinning from the trailer to the tractor. The right angle is not a problem any more! Steering I used two cardan joints in this truck and in the older one, too. The difference is the aim of the joints. Two joints rotate the axles into vertical position in the Daf. One of them compensated the angle, which exists in bends. It means that the motor can’t rotate the axle, if the angle of the trailer and the tractor is smaller than 135 degrees. The cardan joint can’t spin above this angle. In the Renault two joints have the task of compensation. So right angle is not a problem any more! By the way we still have the with the steering. I tried to use servo motor, but it was a fail. The motion goes through a wormscrew, many gears and the two cardan joints from the motor to the steered wheels, so the backlash is big. The servo motor can’t bring back the wheels into middle position after steering. Servo motor is useful, if it is as close to the steered wheels as possible. For example in a bus. In a Mercedes Citaro… If you are technic fans, you may remember that we can find cardan joints between the wheels and motor in 9398. But that set is very big, so the same difference is smaller problem there, as at minifig scale.We are transporting something very dangerous! My previous tiny RCs: Daf, Routemaster, Mercedes Citaro The LDD file is avaiblable on Mocpages. It doesn't contain some elements of the steering mechanism between the two front wheels, it's the meaning of the lime plates. You can see these elements on the pictures or in the video. Thanks for visiting and I hope, it’s not too late to wish you a happy new year!
