yoraish

Looks interesting, can you show us a video?

Thanks everybody! If I had bigger wheels I could most probably try them on, but unfortunately I don't. I started making a LDD file, but there are some parts that don't exist in the program. If you wany I can take pictures of places you can't see so you can build it. Just ask, it's simple after all. I don't think that's possible Thanks everybody!

Presenting my new MOC: The Rock Crawler! You can >Read More< about it. And view the >Pictures<. In my opinion it functions great, but that's just my opinion Video:

It happened to me as well! I tried a few times and it didn't change so I didn't submit at all...

This evening I have finished building my rock crawler chassis. And it doesn't seem like a gear crusher nor a part breaker. It functions great and handles the torque. I agree that if LEGO will make a rock crawler it will most probably have no motors, but I do want them! In conclusion I think kids can benefit a lot from a rock crawler set, and learn about its unique suspension. I see no reason for LEGO not to make one.

I totally agree it has a wow effect! Looks great and has lots of functions. But it's a shame it can't drive well...

Wow, when I read the description I never thought it would go that fast! And it has some power too. I like it

Sounds interesting. I think I'm going on a 8x8 unimog They don't mean it must be a real model right?

DAMN!

Great idea and application too! It must be so much fun to drive :thumbup:

You can easily test the differences with this: Just plug both motors to the same battery box.

It works and looks great! It's funny that when you have snow we have 45℃

Thanks (again) for posting my MOC! I will post further information soon.

Looks and preforms great! I like the excavator+truck combination

Thanks! But did you understand that the first gear (after the chane/modification) will be so: 1:8.337 ratio. And yeah the gear ratio calculator has many hidden abilities!

Hi, Right now im in the process of building another trial truck but some problems popped up. When I meshed 12t and 20t gears the sometimes click under pressure. So I wanted to get the same gear ratio with different gears. And to the point. Right now the 2nd gear of the gearbox is this: And its working fine. But in order to make the 1st gear more rigid I need to change the 2nd one to this: Will there be any difference in the efficiency of the gears? Thanks! P.s. Those images were generated using Sariel's Gear Ratio Calculator.

I didn't notice you used M motors. Why really? XL motors are more efficient. Does it drive well?

Looks great! You reduced the gear ratio a lot, was that really necessary? Can't wait to see the video

I had a sudden urge to build this model right now...

It's very functional! But how do you fire only one at a time?

I actually forgot to weigh it. I preferred the NXT gearbox because it had no design problems. But now I see that the XL motors are more efficient so I'll gear them properly next time to get maximum torque to speed efficiency.

No I won't make instructions for this model. But maybe for future ones!

by yoraish, on Flickr Hi, this is the final version of Tatra 813 6x6. As written at my website: Features a 3 speeds PF gearbox that can be replaced by a 2 speeds NXT gearbox. After building those three other Tatra trucks I think this should be the end, at least it’s a good end. Now, this new truck is very capable and drives nicely. I think that the gearboxes help a lot and make the truck way more efficient. When I first started to build the V3 I wanted it to have a three speeds gearbox, and I achieved that. But right then I noticed a problem with the 2nd gear. Every time it had a little bit of stress over, it clicked and the truck stalled. Most of my building time was spent over fixing this problem. Eventually after all the required fixations it drove better but not yet perfect. And then a new idea struck me, why not make another gearbox with NXT motors? So I built another gearbox, which only had 2 speeds, but worked better. Because the drivetrain was so rigid all the potential problems could only happen in the gearbox. Another problem I encountered was the flexibility of the 8 tooth gears. When the firs gear was under huge stress, I could do no more, the gears themselves could not hang on. But overall the gearbox worked well. As for the design, one of the better choices I made was to make the flat under area and the angled front. This helped keep the drivetrain safe from any high obstacles and help the truck climb over them. I believe that this is the best looking truck I’ve built so far. It has an accurate roll cage and back “thingies”. The actual cab is quiet the same as the V2 but its roof. The suspension worked well and the truck was stable in all directions, and I guess that’s all. So to sum up we have: 6×6 drive 4×6 steering Detailed exterior+lights 3 speeds PF gearbox OR 2 speeds NXT gearbox Full independent suspension. Video: More pictures can be found HERE.

Glad you have no problems with it!

Hi, I looked at your WIP model and found one spot which might be problematic. Your steering system is lacking a bit. Because the links the connect the wheel hubs to the steering rack are placed in an angle, it may cause the wheels to get out of the steering sync or even break it as pressure is applied. I know because I have had this problem in past models, and as you can see, in my newer ones, the links are straight. Hope it helps!