Jan 042017

Hello !

One of the positive facts you can find when you break one of your bones is that it gives you plenty of time to build some new LEGO models !

Last year, LEGO released the 42043 set, the Mercedes-Benz Arocs 3245. It quickly became the flag ship of the brand, the one everybody was waiting for. In my very humble opinion, that set is totally overrated. Of course it’s well designed, has a nice look and it was, at the release date, the biggest lego technic set ever produced, but the pneumatic functions of the crane were totally unefficient, making the set almost valueless speaking of playability.

The B Model of the set is a smaller version of the Arocs, the 1845 (an Actros ?), it’s composed of a truck and its trailer. Overall, the B model is for me much better, the look remains excellent but the addition of the trailer makes it much better to play with. All the pneumatic stuff was moved to the trailer and used to build a smaller crane, more efficient than the one from the A model. All considered, that B model is a much better build, more fun, integrating almost all the functionnalities of the A model, just better developped and organized.

It’s after watching some Youtube videos than I realized that the B model has such a great mocing potential. The one realized by PPUNG DADDY (From Korea), a full remote controlled version of the truck, inspired me and made me decide to build an advanced version of the 1845, including more functions.

Remote Control

Steering (front axle) : After few hours of work, i decided to borrow PPUNG’s idea and use a servo motor directly fixed on the front axle, it’s not discreet, but very efficient, and I could not figure how to build something smarter. Then, instead of re-inventing the wheel, I followed PPUNG’s instructions and used his steering mechanism, all credits to him for that part (Thanks !)

Driving (rear axle, doubled wheels) : What’s the goal ? It’s a truck whose aim is to move trailers. Does it have to move fast ? Clearly not, or manoeuvres will be extremely complicated, especially when moving backward with a trailer attached. So, I decided to use a simple L motor and to hide it the better I could. I removed the fake motor and placed the L motor at its place, this left me enough space for gearing down and deliver enough torque to the rear axle at a reasonnably speed. The biggest interest of this solution is that the power function motor is totally hidden under the cabin which greatly help to preserve the overall design.

Front lights : The hardest challenge of that improvement was to hide the light emitted by the power function lights on the sides of the truck and on the front part of the front wheels. I decided not to transform the 1845 into a nightclub and to limit myself to the 2 biggest lights of the truck, situated on each sides of the front bumper.

Infra red receivers : 3 motors and one light kit makes 4, so I had to place 2 IR Receivers, and if possible, not far of the battery (that did not moved). Lots of trucks have a radiator for the climatisation behind the cabin, I’ve built one to hide my 2 receivers, It’s not to much ugly and the receivers are well hidden. Small counterpart, you have to be behind the truck to drive it.


5th wheel : The goal of the truck is to move trailers, so the main function, after the ones concerning the movement is the 5th wheel. On the A model, it’s working well, but does not remain locked and may move with vibrations, releasing the trailer. So, I had to fix that and decided to add a pneumatic cylinder. I found a way that suits me well, the cylinder gives a nice look to the 5th wheel, pity LEGO does not make black cylinders…

Tilting cab : This was the biggest challenge of the reworking. The cab is somewhat heavy and requires at least a big pneumatic cylinder to be pushed forward, and even bigger to be moved back to its normal place. Impossible so to use a small cylinder like for the 5th wheel. The problem with the big cylinder is that it requires lots of space. I placed it between the 2 seats but this asked me lots of work to rebuild the cabin around it. Anyway, this is where the fun is, no ? 🙂

Pneumatic pump : Placed just behind the cab, it’s not very discreet, but people usually enjoy watching that kind of mechanism when it is in action (I try to justify my choice !). The motor for the pump is located under the cab too, totally invisible.

Air tank : The use of an air tank really improves the use of the pneumatic functions and makes it more realistic. You don’t have to make the pump work when you want to move the cab or open the 5th wheel and this is really a plus. It replaces the spare wheel on the side of the truck (note : I made 2 PDF instructions files, one with the air tank, and another one without, that part is rare).


I’m quite satisfied of that moc. It asked me lots of reworking time (30+ hours), I had to make several technical choices and find how to add functions without denaturing the original model. Please note that you’ll need almost 100 additional parts to build the truck, none of them are rare (except the air tank). Making the instructions and the computer images took me around 20 hours. I got lots of questions about the softwares I used so I’ll soon make a post about that.

Thank you for reading me.


Credits :

  • Front axle steering design : PPUNG DADDY (https://www.youtube.com/watch?v=RqbM-h8Yw-Q)
  • Modelling : LDCAD
  • Pneumatic hoses : MLCAD + LSYNTH
  • Parts : LDRAW + unofficial parts
  • Rendering : Persistence of Vision (imports with LDVIEW)
  • Instructions LPUB3D

Download the free PDF instructions : 42043 B Model Advanced RC (1308 downloads)
Download the free PDF instructions of the alternative model (no air tank) : 42043 B Model Advanced RC - No air tank (1384 downloads)


Custom Rock Crawler Pickup – RC – MOC

 Global, MOC, Truck  Comments Off on Custom Rock Crawler Pickup – RC – MOC
Mar 312016

CustomRockCrawlerPickup2Hi to all of you !

Two of my favorite sets are the Customized Pick up Truck from the year 2014 (set 42029) and the 4×4 Crawler from the year 2012 (set 9398). Inspired by them, I’ve decided in februray to build a new MOC

42029_boxThe 42029 Pick up is in my humble opinion the best looking set of the last years. It’s well proportioned, the color choice is interesting and I liked the functions and the way it’s been built.

Read my review of the set here : http://lego.vilvert.fr/42029-customized-pick-up-truck/

I liked it so much that I decided to built my own version, fully RC : http://lego.vilvert.fr/2015/08/30/42029-customized-pick-up-rc/

One of the limits of that truck is that it’s not a real 4×4 (not a 4×4 at all anyway since only rear wheels are driven !). The Remote Controlled version I built proved that fact, the truck is not able to climb rocks, nor even move when the ground becomes complicated.


9398_boxAt the opposite, the 9398 4×4 Crawler is a true all terrain vehicle, even if his differentials limit a bit its ability to cross certain obstacles, it’s made for the exterior, the mud and the rocks !

Speaking of playability, that set is probably the only one that could be considered as a toy by itself if it was not made of Legos. A 6 years old kid may play with it, making obstacle races or outdoor driving without feeling the limits of playing with a lego car.

It also has a nice look, less accomplished than 42029 though and the choice of the colors is discutable.



Inspired by those two, in february went the idea to build a bigger version of 42029, exploiting the efficient chassis of 9398. In the specifications sheet, from the 9398,I replaced the L motors by XL ones to increase the torque on the 4 wheels and added some headlights in the front. From 42029, I kept the tilting bed but removed the front winch with the idea to reinvent the front of the bodywork and make it more potent.

Building and rebuilding took me at least 3 weeks and lots of modifications but finally led to something which is not always the case for me ! So, here’s my remixed version of the 9398 and 42029 sets, with a few personal additions. Please browse the galery below to discover more of the changes I made to the original models.

As usual, instructions are delivered for free in PDF, feel free to download them and to donate me a few € if you like them or want to contribute to my upcoming builds !

Clic here to download the PDF instructions :  Custom Rock Crawler Pickup RC MOC (887 downloads)


42041 – Race Truck – RC

 Global, MOC, Truck  Comments Off on 42041 – Race Truck – RC
Oct 022015

Hi !

42041 - RCThis is my remote controlled version of the 42041 Race Truck. This small set has a nice look, and as soon as I built it, the envy to make it fully RC came to my mind !

It’s rather small tho, not much space for the motors and the battery box so I had to make concessions ! The battery box has been installed into the cabin, it’s not very pretty but that’s the only free space in the truck. It should be possible to make it less visible, by removing the tipping the cabin and putting it very low on the chassis. That’s not the choice I made because then it would become complicated to extract and replace.

It’s rather small tho, not much space for the motors and the battery box so I had to make concessions ! The battery box has been installed into the cabin, it’s not very pretty but that’s the only free space in the truck. It should be possible to make it less visible, by removing the tipping the cabin and putting it very low on the chassis. That’s not the choice I made because then it would become complicated to extract and replace.

The steering is controlled by the usual servo motor. I choosed a large Power Function motor for the driving because I wanted speed instead of torque. I’ve kept the V8 engine that occupies lots of place, so the easier place where to install the motor was at the rear.

This is a quickly made MOD for a small set. Although, it’s very fun to play with because it’s fast and has a very nice steering efficiency. Keep it on easy surfaces, and avoid outside grounds !

You can also replace the rear wheels by bigger ones, it will make the truck even faster !

Click on the following link to download PDF instructions :  42041 - RC - PDF (1519 downloads)


Aug 302015

Hello !P1170214

The 42029 Pick Up has been one of my favorite designs as soon as i saw it. It’s a rather small kit, only 1060 parts compose it. 3 main functions, a front winch, a tipping bed and a hand of god steering to manipulate the truck, all of them are manual. The instructions integrate a guide that allow you to add a motor and a battery box to the winch and the tipping bed. Those functions are basic and not really playable, the choice of a tiny actuator for the tipping bed won’t allow heavy loads, and the winch is funny… few minutes. Poor functions perhaps, but what a look ! The choice of the red color makes it aggressive and the huge cabin and its impressive guard gives a good impression of power.

What is fun on such a model for me, is to transform it into a fully remote controlled car so it becomes really playable, allowing you to slalom among stack of tires, carry small things or just play like you would with any other remote controlled car, Lego or not. My 7 years old kid kinda shares that opinion with me 🙂

So, no need to argue much, the decision to build it again and to add motors to its chassis was taken in 10 minutes !

My choice went to :
– An XL motor for the propulsion, it has lots of torque and won’t require much gearing down like the other motors would need.
– A servo motor for the steering. First, I checked how much rotation was need to steer the front wheels from center to the sides and the servo motor was offering me exactly what I needed, with the big gain of offering an automatic return to center, which makes the driving much more easy from the remote controller.

chassisFor the building, I took the original instructions and built the model, then, when the chassis was made, I started to examine it from close to find where to add the motors. The main problem was to keep the V6 engine operational whereas it was located very far of the rear axle. I did this by creating a new path between the rear differential and the front of the truck, going just over the 2 motors that I positioned the lower possible, to hide them and keep the original look preserved.

This task asked me to remove lots of pieces and replace them by the needed ones. Once the parts originally needed for the steering removed, most of the job was done and I could finish the entire build.

The end of the assembly was a kid game, since I kept it as close as possible of what it was at its origin, I had no difficulty to finish to build it with the original booklets. The very last modification concerns the roof which now has to support the infra red receiver, settled inside the cabin.

I’m pretty happy of that moc because it’s not distorted by the modifications made, and it’s really playable. My son and I played a full afternoon with it trying to film ourselves to build footage for the Youtube video to come.

Downloads :