Der Unimog - 8110 MOD v4 (with 4L motors and RC electronics)

This is the fourth version of my trial truck built from the LEGO 8110 Unimog U400 set. This time, I decided to use RC components instead of the LEGO PF-compatible system to get proportional steering and driving. The truck also features a two-speed gearbox with a center differential that automatically locks in low gear. The gearbox layout is similar to the Land Rover Defender v4, so the ratios are the same - 1:1 in hi gear and 1.67:1 in low gear. The truck is powered by four PF-compatible motors that provide decent speed and torque. For steering, I used a Geek Servo motor, and another Geek Servo motor is used for shifting the gearbox. The model is powered by a 3S LiPo battery (3x18650) which is located above the rear axle for better weight distribution.

The chassis dimensions are the same as the original 8110 Unimog U400 set. Instead of the fake engine, an L-motor is installed for the front PTO.

The cabin is almost the same as in the previous version, only the passenger seat became wider.

Specs

• Steering: Geek Servo motor
• Propulsion: 4 * PF L motors (non-original with higher RPM)
• Full-time AWD with lockable center differential in the low gear
• Open differentials in axles (no locks)
• Two speed gearbox switched by a Geek Servo
• Turning diameter (by wheels):
  • 1st gear (central diff closed): 140cm
  • 2nd gear (central diff open): 136cm
• Front PTO: PF L motor
• Rear PTO: None
• Without pneumatics
• Custom front and rear LED lights
• Powered by 3S LiPo (3x18650)
• Receiver: FlySky Fs-R6b
• Curb weight: 2.0 kg
• Functions with remote control: driving, steering, gearbox shifting and front PTO

Gearing:

Body

Components

Radio configuration

End points:

• 1ch (steering): 93%
• 3ch (gearbox): 32%
• 4ch (winch): 47%