LEGO Half Abnormal 4x4 Paleolithic Extender

[Kamil]

LEGO Half Abnormal 4x4 Paleolithic Extender V1.0

After my previous trials with 4x4 and 6x6 Legos, I was planning to build this:

Sbarro Windhawk

https://www.6-wheel-drive.org/vehicles/sbarro.html

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Later, I discovered this creature by chance:

Hydraulic extending Rock Buggy

https://www.youtube.com/watch?v=dbPYj7Zd_vk&t=22s

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Then this one popped out:

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So I decided to combine last two to solve the problem of Lego vehicles sinking into the sand:

All the best

 

Edited Wednesday at 02:54 PM by Kamil

[2GodBDGlory]

That's a pretty wild concept! I'd love to see some more of the technical details. What kind of mechanism are you using for the extension?

Also, how does the suspension with those dampened shock absorbers work? I've thought about using them a few times, but the dampening seems like it would be too annoying on extension

[Kamil]

On 3/25/2026 at 6:47 PM, 2GodBDGlory said:

That's a pretty wild concept! I'd love to see some more of the technical details. What kind of mechanism are you using for the extension?

Also, how does the suspension with those dampened shock absorbers work? I've thought about using them a few times, but the dampening seems like it would be too annoying on extension

Thank you ! 

I am planning to share technical data whenever ready, some photography is still undergoing. This vehicle is constructed in modular style, and all four blocks, including the cabin,  can be separated under one minute. Then I hope to show the extension mechanism separately. As a clue, all crane like extensions have not worked here because they could not provide sufficient attachment points. In my design 3+3=6 links are available on each side (front and rear).   

I can talk about suspension. Sadly the one in the video is my C plan. My A plan was 2 springs + 1 air cylinder (damper) combination. That was working perfectly well. It was bouncing like a real Traxxas RC Baja. Soft compression and slowly recovering decompression was available. When I added second battery box and the cabin, the vehicle lost ground clearence.  I added two more springs, have not worked either. So I preferred two air cylinders as a C plan. These have enough travel while carry more load compared to the spring.  

PS. Sadly not all the air cylinders have same character in my collection, so I can't give a standard answer. I have selected the softest ones. The vehicle still has extreme articulation. Extending mechanism also allows a lot of torsional twisting.  Finally, the pivot points, and angles of these suspensions play a great role, the ones on the suspension arms are closer to the mid body, this softens. 

Best wishes

Edited yesterday at 09:16 AM by Kamil

[Kamil]

Hi, 

Testing is ongoing to see what this vehicle can do.

Here:

Down driving from 155, 235 and 387 mm high steps is introduced. Some horrific roll forward accidents also included in the video:

All the best

[Jundis]

This is really an insane concept. Never thought  this would work actually :D

[Kamil]

12 hours ago, Jundis said:

This is really an insane concept. Never thought  this would work actually :D

Thank you !

I honestly couldn't have imagined it would be this much. Because the vehicle I was inspired mostly (hydraulic extending rock buggy above) is designed to be effective on high rock walls. However, showing where else this vehicle's extension ability could be effective requires a bit of research. 

Due to the rain in my area, I haven't been able to experiment outdoors, and on rocky terrain yet. I'm curious to see how it will perform there. 

Edited 2 hours ago by Kamil