Today I'd like to show you my version of the Fennek reconnaissance vehicle from Lego Forces:
https://lforces.com/Fennek.html
You may already know me from other forums such as "Dr. Brick," so I'll forgo a more detailed introduction. In addition to ready-made kits from Harry Potter and Star Wars, I mainly build Technic models and MOCs in Arocs scale. I value scale precision and well-thought-out functions, whereby the effort should be in reasonable proportion to the model's use and effect, especially since you're limited in parts and their colors. In that respect, this model is already seven years old, and there are now more parts in dark green and, for example, shock absorbers in black, too. Some parts were available in brown or black, which is where the idea for the camouflage scheme came from.
Some parts aren't Lego, such as the RC tires. At approximately 70 mm, these are actually a bit too large, as the original rolls on "normal" truck tires, but that way you can clearly see the difference in profile. It's also two studs wider than the Arocs, but in reality, at 2,550 mm, it's slightly wider than, for example, an 8-foot ISO container (2,438 mm) or an Actros cab (2,482 mm), too. Overall, that would amount to less than half a stud per side, and theoretically, you could build it 18 studs wide, but in that case it is not possible due to space constraints alone.
A few numbers on this: The model has 1,326 parts, although I needed a second extension cable and marked all cables with different colored tiles. A total of nine motors and four infrared sensors for the eight functions are installed. In addition, there are suspension and opening doors, hoods, and hatches. (For comparison: The LEGO Liebherr R 9800 (42100) has only seven motors and is considerably larger with 4,108 pieces.)
It weighs approximately 1.6 kg, but thanks to the two-speed transmission and the traction of the soft tires, it can still manage inclines of approximately 40°. I also installed the heavy-duty differentials from the Zetros, which significantly reduces the gear ratio (12 to 28 teeth or 1:2.33 instead of 20 to 28 teeth or 1:1.40). This means that the torque increases by approximately 66.4%, while the speed or rpm is inversely proportional, decreasing by approximately 39.9%. In first gear (1:3 instead of 1:1) there is a torque increase of approximately 400 % with an rpm change of approximately -80%. That’s equivalent to the power of ten L-motors!