Hi, EB!This is my first trial truck - tatra t815.

Drive : 1 XL motor geared 12/36-12/20-8/24

Hope you like it :)

Overview

Back

Bottom

Front Axle

Reduction from XL

Edited December 20, 201113 yr by Kit Fisto

Overall it looks very nice, but I got some spots for improvement:

• The angle of the wheels is too tight
  
• Try and make the wheelbase a bit narrower .
  

But it looks pretty good for your firs truck!

Can you upload a video?

I`ll try to make video tomorrow, now it is too dark.

-The angle of the wheels is too tight

I don`t have this shock absorbers: http://www.bricklink.com/catalogItem.asp?P=731c04 so I had to use rubber bands, suspension was too mild.

-Try and make the wheelbase a bit narrower

Have no ideas how to do it...

Edited December 18, 201113 yr by Kit Fisto

Nice tarta! i really like the cab design.

tim

-Try and make the wheelbase a bit narrower

Have no ideas how to do it...

I'm actually building another Tatra right now, and it has the realistic- narrow wheelbase. If you like I can upload some WIP pictures of it.

Sounds great :)Upload them, please.

Here you go, a video of the drivetrain.

Notice that there is only one motor cause my other one is broken...

Thnank you:)

But I can`t understand one thing.

If I`m not wrong, the top knob gear isn`t similar to the bottom.So, one wheel isn`t like the other, is it?

Updated photos!

Edited December 20, 201113 yr by Kit Fisto

Thnank you:)

But I can`t understand one thing.

If I`m not wrong, the top knob gear isn`t similar to the bottom.So, one wheel isn`t like the other, is it?

Wheels are the same, they are just not align perfectly.

Here is real life example of this setup.

Note how gears on this picture are also placed in a way that axles are parallel, but not in a line.

This way?

ABCD - parallelogram, not rectangle?

Edited December 20, 201113 yr by Kit Fisto

ABCD - parallelogram, not rectangle?

Exactly

Update :)

Nice model, does the "snake" link on the last pic work ok? I would have thought something like that might cause a lot of friction/wear?

I have had no problems yet :)

Good good, I also just noticed that its not a single long "snake", but 2 separate links lol

When I first looked it appeared to just go from the gear straight down, but you have it linked through the central bar.

I would love to see a video of that part in action as well as the whole thing.

i would love to see a video as well. Very nice progress!

tim

It`s finished! :)Gear ratio is the same :8-24-8/24-12/20

Edited January 17, 201213 yr by Kit Fisto

I love trial trucks and your truck is looking very cool.

The way of steering is a bit confusion, but if it´s working, why not.

I love the look of your tarta. Video?

tim

Video!

Comment please

Edited February 16, 201213 yr by Kit Fisto

@ Kit Fisto: Your Lego Tatra T815 trial truck looks very capable! Have you tried it out in the snow?

http://www.youtube.com/watch?v=ijsngv6JQkc

No,I haven`t.I`ve made it out today, because I want to build other truck.I think it was a good Truck Trial start for me

No,I haven`t.I`ve made it out today, because I want to build other truck.I think it was a good Truck Trial start for me

Aww that is too bad. Looks very capable truck!

tim

hi, i want to explain the working of the tatra´s independent suspension, in a picture i used the Steyr Puch Pinzgauer transmission, which is made in the same principle: https://www.dropbox.com/home/suspension

In these pictures maybe you can see how this transmission system works, the blue line represents the output of the engine, and the red and green lines the wheels axles, in the LXF file, the model 2 is very likely to the transmission used by Yoraish in his truck (which is very likely to the real life system), the model 3 in LXF file is used by some builders to fix the different axis between the wheels, and the model 1 its how it would looks like in real life trucks, which gives the option of a differential, and maybe, if someone could make custom parts, this transmission would be possible to build very likely to real life trucks, i hope this could work for you, and nice truck Kit Fisto, it remembers me a truck i made long tima ago with rubber bands instead of shock absorbers.

pinzgauer is very similar but uses portal axles and is more compact (smaller vehicles)