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T815 8×8

Friday 4 June 2010, by yoraish

See it online

Technical data

Scale (wheels used)
Width 26 studs
Total Weight 1 grams
Transmission 8x8x4
Motorization 2 motor(s) - NXT

working fake motor
Steering motor

without steering wheel
Onboard Battery Box NXT

As written at my website:
Large model of the 8×8 Czech military truck.. Featuring 8×8 drive 4×8 steering, full interior and exterior and remote control.

***Instructions for axles available for the next few days-If you want me to make them-comment***

Actually I started thinking about building a tatra a while ago (if you followed my videos), but my final inspiration was Sariel’s Tata 6×6. Back then I tried to come up with a solid and strong design for the wheels power transfer- from the driveshaft to the wheelbase. As soon as I saw my design and even Sariel’s were not efficient, I searched the net and found the amazing “TATRA MARATHON EDITION”, it had the ultimate power transfer. My truck’s shaft is inspired from him.

The usual Tatra trucks suspension is swinging half-axles. I achieved that kind of suspension by simply connecting a shock absorber to each one of the wheels and connecting them to the drivetrain in a way they can swing in an arc like shape.

The drive train was kept as simple as possible, in contrast to the older evolutions of it. It, now, has no gearbox- after it was found not working good enough. The drivetrain: there are two parallel axles that go along the chassis. They are connected to spin synchronically via 2 -15t gears. Each wheel has its own gear ratio fixing gears. That meand that every wheel has his own set of gears the give him enough torque for completing a truck trial race.

Now for its look, inside the cabin there are two adjustable seats, a working steering wheel and a working V8 fake engine powered by a micromotor. It’s usually disconnected because I have no more ports available on the NXT . Outside it was meant to look like a Tatra, as far as it looks like it….

The truck is controlled right now with a simple NXT to NXT bluetooth communication. I’v tried to write (in NXT-G) a program for a Speed Remote control using another motor as the speed ”clock”, well, it failed. So if you can help me with it, comment!

In my opinion this is my best truck so far and by far!

View online : Yoraish’s Lego Creations

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