About this 3D model

After finishing with the OBTS chassis I knew I was not covering all RC car types with that one. That's why the MTC chassis started to appear in my mind. The main goal this time is to have a great clearance, so the center of gravity is also higher. This will make the car to roll over if you turn close at high speeds. Also all the parts are a little over-sized to be as strong as possible, but maybe this makes the car a little heavy too. The way I designed this chassis can be observed in the evolution of my publications in thingiverse. I had all the ideas finally made real in my mind from the beginning, but I could not face their design challenges all together. That's why my "designing style" for this chassis was something like "let some doors opened" to continue the work in other directions after taking some key design decisions in some points. There are a few successful makes of this chassis now and I also had the chance to test it, improve it and film it! Please, take a look to some of the next videos to know more about this chassis, mostly in the Independent Suspension Version. Here they are: Speed Build Test Drive of the MTC Chassis Yuran Liu's MTC Chassis Video MyRCCar MTC Chassis with the Typical Pickup Body and 1:3 gearbox reduction MTC Chassis with Typical Pickup Body in high-lift mode MTC Chassis with FJ Cruiser Body having fun more than crawling Remember to subscribe to my Youtube Channel if you want to watch my latest videos! This would be the most representative video: CHARACTERISTICS AND OPTIONS The main chassis structure Instead of one big lower plate as in the OBTS chassis, this one is made of "bars" and "platforms". The main measures for the chassis are similar to the ones of an Axial SCX10 and allow you to build a model with a wheelbase from 270 to 330 mm. The shape of the chassis tries to be narrow to fit where an Axial SCX10 would fit. The Axles The MTC chassis design started having just a few options but ended with some more. The most important option is the kind of axles you want to use. I call them like this: Independent Suspension System Version: This version is the first one, and I re-used many already designed parts from OBTS chassis, as the F/R differential housings or the center differential housing. I wanted you to be able to dis-assemble your OBTS chassis and be able to build another kind of chassis with the same sourced parts and a few new printed parts. As I had this parts designed I centred my efforts in designing a chassis which could use them but the same time "let those doors opened" to be able to design and use other parts to make the chassis more versatile. Rigid Axles Version: The RC crawling world is really big and I was not covering their needs with this chassis and it was one of my goals. Trying to use the same sourced parts than in the other version of MTC or OBTS chassis I designed a compatible system for Rigid Axles of various widths and a multilink suspension system for them which should allow the use of different wheelbases too. But this kind of chassis needs a special kind of central transmission. I designed what I call a "Double Cardan Variable Length Transmission" as this part is not as easy to source as the others. The fun thing is that, as they share the main part of the chassis and center differential, you can also build an Hybrid! I mean a car with front independent suspension system and a Rigid Axle in the rear. Obviously you could also build the inverse hybrid but I think it is not common. The Gearbox This chassis can use the same Center Differential Housing than OBTS one, mounted over the central platform. This is how I started doing my first tests with this chassis. This can be enough if you don't have big wheels and have the right motor + ESC. This was not my case. I bought 128mm diameter wheels and had the motors from my previous "speedy" OBTS builds. So... my motor got really hot very quick, that's when I realised I needed to "gear up" the thing. So I designed a new Gearbox which can be mounted in the same place than the simple center diff. housing and will allow you to choose between various reduction ratios :) And the best of all is you can use it also as simple center diff. just introducing the differential into its housing in the reversed position, in which the motor pinion attacks directly to the differential main gear. The gearbox is heavier, use 4 extra bearings and the access to motor mount screws is harder but I think it really worth it! Steering in both axles If you are thinking in building a kind of Monster or Crawler with steering in both axles, you are lucky! The symmetry in front / rear part of this chassis will allow you to do it. The only thing is that you will need to put your battery higher, over the "Top-Cover" parts. For the rest of these building instructions, we are going to take the Independent Suspension System Version with gearbox. That means all things related to the Rigid Axles, Multilink Suspension System and the Double Ca