Lego Technic 42099 Terrain Explorer MOC

Rebuild your Lego Technic "4x4 X-treme Off-Roader" set 42099 into this "Terrain Explorer" truck alternative model using these digital building instructions. No extra parts needed!

Functions:

- Remote-controlled steering and rear-wheel drive

- Live axle front and rear suspension

- Spare tire manual unload mechanism

Worth mentioning aspects:

- It's RWD with a gearless 1:1 ratio.

- Reasonable ground clearance for its size and type of vehicle (3 studs).

- The batteries can be easily swapped from below.

- The hub button can be pressed by pushing the driver's seat.

- The mechanism to unload the spare tire needs to be manually unlocked, it then slides down on its own.

Designer Notes:

Designing an optimized chassis saved a lot of pieces which I then used to create a more elaborated body, a simple interior, front grid, bull bar and even included a mechanism to slide and unload the spare tire, which is its only manual function.

To achieve the objective, several design choices had to be made:

- It has no transmission, and the rear wheels run directly on the motors: no gears involved means no friction and better performance.

- Live axle suspension was used both at the front and rear, this allowed me to use solid axles with a simpler design, reducing complexity all around and using way fewer pieces on the chassis.

- I chose not to use the planetary wheel hubs available on the set for two reasons, they would add complexity to the build, and most importantly, despite being lubricated on the inside, they still create a bit of drag if used for example on the front wheels, which have no traction and I really wanted to avoid all kinds of drag or friction.

Building Instructions:

- Instructions for cable management are included.

- To guarantee the correct operation of the MOC, I implemented limiters for the steering and suspension (both rear and front), these are pointed out on their respective steps and the option to take them out is also available.

- Real pictures are included whenever there is the need to see in detail.

- A detailed step-by-step tutorial is also included to set up the "Powered Up" app and control the MOC.

Digital building instructions sample:

Photos:

NO BRICKS INCLUDED! - YOU'LL GET ONLY THE DIGITAL BUILDING INSTRUCTIONS AND A PARTS LIST.

Keywords:

Lego Technic, MOC, AFOL, building instructions, toy, building blocks, racing, remote-controlled, motorized, alternative model, alt build, lego 42099, off-road, rebuild, c-model, rc cars, buggy, baja, trophy truck