[WIP] 42128 Reverse Engineered

[shimon]

Hello everyone, 

After seeing the huge amount of functions on this beautiful truck, I decided to try sharpen my technic skills and attempt reverse engineering it.  

I was able to recreate the major functions using some hints from the pictures and logical deduction, it was quite challenging. 

*WARNING* Those of you who don't want a spoiler on the possible mechanism solutions, don't look at the pictures. 

I have completed most of the model but stopped at the current state due to lack of parts, so before disassembling it I wanted to share it here. 

 

 

 

Edited June 9, 2021 by shimon

[Aleh]

Cool experience! Soon you'll be able to assemble Chiron/Sian without instructions :)

Keep building!

[Rebel_Lego]

Interesting that you made hood openable. I had the idea from the pictures that it couldn’t be done but this gives me hope for the set! Great job

[gyenesvi]

6 mini LAs + 3 pneumatic cylinders in a set sounds too good to be true :) From the images, I was guessing that the rear standers are operated by a lever mechanism with a worm-gear. Do you actually see the LAs there?

[shimon]

@Aleh Thanks! I hope so

@Rebel_Lego Thanks! this is actually the part I'm most satisfied with because the hood is very sturdy and easy to open

@gyenesvi I'm 99% sure that there are 3 cylinders (2 thin), about the 6 LAs, I did think using a worm gear but further reduction was needed to match the side outrigger LA speed and there isn't much room for gears there but I guess it can be done. and yes the bottom center pic reveals a round 1 x 1 beam that can be the top of a mini LA

 

[howitzer]

Very nice. It would be great to see side-by-side comparison once the set has been released and thoroughly analyzed and see how much of your reverse-engineering was correct.