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NEW: A complete LDraw file is available - see [homepage]
My first MOC in 1:13 scale: a 2003 Mercedes-Benz Actros 4150K (gross vehicle weight of 41 tonnes, 500 HP and a special frame to mount a tipper (Kipper in German). For reference, here a is a picture and the datasheet of the real thing.
The tipper itself is a Meiller 2-way tipper datasheet with bordmatic (hydraulically actuated side panel) on the left side and a normal side panel (with spring relief) on the right side.
Last but not least there is a rear mounted HIAB 225E loading crane with outtriggers.
Here are the rough technical specifications:
- Both front axles are steered (4:3 ratio) featuring independent wheel suspension (the original LEGO® springs had to be replaced with some strong springs from the Do-It-Yourself store though to withstand the weight of the driving cab)
- The steering mechanism is operated via a knob on top of the driving cab (this doesn’t look very realistic, but it really adds to the playability of the model and LEGO® still is a toy in the fist place :D )
- Both rear axles are driven (including a 1:3 reduction after the differencial) featuring complete axle suspension
- A 6-speed transmission (a compact version of the 8448 transmission) is built into the drive train
- After that comes a standard LEGO® V8 motor
- The model has three 9V motors (with the battery box being mounted behind the left side protection):
- One 9V-mini-motor to power the double-pumped compressor
- One 9V-mini-motor to deploy the outtriggers
- One 9V-mini-motor to slew the loading crane
- The double-pumped compressor supplies air to 16 pneumatic cylinders:
- 2 old yellow cylinders to tip the driving cab (the cylinders are contracted with rubber bands and the weight of the cab)
- 4 cylinders to lift the tipper
- 1 cylinder to select the tipping to the left/right
- 2 small cylinders for the bordmatic
- 3 double cylinders for the loading crane (lifting/lowering the first and second segment, extending/rectracting the third segment)
- 1 cylinder to open/close the clamshell bucket
- The pneumatic switch for the driving cab is located behind the front spoiler, all three switches for the tipper are located inside the diesel tank on the right and the four switches for the loading crane are situated above the rear bumper.
The model is fully functional on the whole - the only problem left are the weak Lego pneumatic cylinders in the loading crane. If powered by the compressor, it is near to impossible to reasonably actuate the loading crane with a mounted clamshell bucket. Whereas if you are using the hand-pump to support the compressor, it sometimes happens that the pneumatic switches can not withstand the pressure.