[HELP] Full suspension truck with only 3 springs

[Mantarri]

Hi, I'm trying to make an offroading truck with full suspension, but I only have 3 springs (2 9.5L soft, and 1 6.5L Normal), and am trying to figure out how to use them to make my vehicle full suspension, requirements.

• One axle must steer, and the other drive.
  
• If it uses universal joints, it can only use 4L ones ( I don't have an 3L ones )
  
• Can't use frames.
  

Thanks in advance.

-XtremeBuilder

[offroadcreations]

I would use the 2 9.5L's in an independent front suspension, and the 6.5L in the back in a dragged axle, like in 9392:

[Mantarri]

Hey @Offroadcreat1ons, thanks, I'll try that.

P.S. I've not got tons (actually lbs ) of lego technic, but no wheels that are larer than those one with the smooth tread, and small rims.

[offroadcreations]

You're welcome. Well, the fun part of Lego is solving problems, so you just have to find out how to make the small wheels work. Good luck!

[Lego2016Lego]

You don't have big wheels so you could do something like what I did http://www.eurobricks.com/forum/index.php?showtopic=125475&hl=mini you could make the front independent and the back like what I did.

[Victor Imaginator]

I would use the 2 9.5L's in an independent front suspension, and the 6.5L in the back in a dragged axle, like in 9392:

Agreed. And i thinking about suspend rear axle with one spring, but also make a stabilizer bar between left and right side using simple axle as torsion.

I remember how it was for me, i had 42009 only and i wish to build a truck with working suspension. I used axles as torsion bars and managed to make full independent suspesnsion, it was ugly and too heavy/fragile, but it works)

[deehtha]

8081 also only used 3 shocks. 1 in the front and 2 in the rear.

[Rockbrick]

Here's something i did with live axle and springs - could be adapted to use one spring at the back and have quite a free level of movement:

[Mantarri]

Thanks so much for all of the suggestions. I'm currently working on sorting all my new LEGO and It's basically

[Imanol BB]

What about if you use leaf spring suspension in the rear axles and the 9.5L ones in the front?

[Mantarri]

What about if you use leaf spring suspension in the rear axles and the 9.5L ones in the front?

The only problem is I only have one of the flexible axles. Edited May 31, 2016 by XtremeBuilder

[Imanol BB]

You dont need only flexible axles, even normal cross axles work, you could also make the same suspension as ZBLJs Tatra using rods:

[offroadcreations]

I am working on a new MOC, and came up with this for a rear suspension. It's like 5893; there is no suspension. Only 1 wheel can go up at a time.

Edited May 31, 2016 by Offroadcreat1ons

[Kman860]

Pendular^

[offroadcreations]

Thanks, I didn't know what it was called.

[Kman860]

No problem

[Vectormatic]

How about making a somewhat normal independent style dual wishbone axle, then put the shock between both upper wishbones, and putting in some sort of anti roll bar like construction? It obviously wont be independently sprung, but it should keep the car nice and flat through corners and absorb bumps

[Didumos69]

How about making a somewhat normal independent style dual wishbone axle, then put the shock between both upper wishbones, and putting in some sort of anti roll bar like construction? It obviously wont be independently sprung, but it should keep the car nice and flat through corners and absorb bumps

If you do that you could also do something with longitudinal torsion bars. That works even without shock absorbers. I used this in my Steppenwolf-suspension.

Edited June 1, 2016 by Didumos69

[Lego2016Lego]

You could do a buggy like this with one spring in the back http://www.eurobricks.com/forum/index.php?showtopic=133570

[TheMindGarage]

Try torsion-bar independent suspension. I've made plenty of cars with it and it's worked fine, with no axle damage!

Basically, add beams to your suspension arms so that the pivot point has an axle hole rather than a pin-hole. I would use the 2x4 "L" beams or the thin 3-stud beams with two axle holes. Then build your suspension as you would normally, but fix the torsion-bars rigidly at each end. I recommend a 1-stud gap between the torsion bar supports and the suspension arms - for best performance, this gap should be filled by a small beam which is supported elsewhere.

Examples that I have made:

http://www.us.lego.com/en-gb/mindstorms/community/robot?projectid=3ae9ca80-3a72-4f34-8f5e-fbd67d9310f6

http://www.us.lego.com/en-gb/mindstorms/community/robot?projectid=d4ec7bdc-b5cf-433e-b125-8f1fc47e862f

http://www.us.lego.com/en-gb/mindstorms/community/robot?projectid=6967cb54-cb09-49c5-a33c-07d02dc56f67