Mammoet "Beast" 8x8 Actros Titan full PF

[andythenorth]

So this is a big Mammoet truck: 8x8, former tank transporter prime mover, now converted to heavy haul tractor, based on MB Actros, heavily adapted, probably by Titan Special trucks http://www.titan-sf.com/index.php/en/ (or by MB special vehicles unit, I'm not sure).

http://s697.photobuc...3kopie.jpg.html

Brickshelf user Spacey did this full PF one http://www.brickshel...y.cgi?i=5868908

Anyway, my build has hanging around since 2008, what with kids etc, it's been slow (and redesigned entirely once), but it's getting closer to done.

Cab is stolen from 8258 temporarily, right size, but doesn't look like an Actros, and needs to be black

Rear wheels have one PF XL motor per axle. Diffs lock with small pneumatic cylinders (design stolen from Sariel).

Front wheels have one PF XL driving both axle, no diff locks. Reduction gears front and rear.

Front and rear bogies are pendular (rocking towards front and rear of vehicle), and everything flexes. It's built for pulling power, rather than crawling, but it will go over moderate rough terrain.

Two AA battery packs for more power, driving via 3 IR receivers (V1), reason for using 3 is to try and maximise power to the motors, the IR receiver is a limiting factor; using more of them is better in this case.

Steering is with one PF M motor, driving an unusual arrangement with worm gears. Both axles turn at same angle, no proportional steer on second axle, no room here.

There are twin winches driven by shared L motor, winches can be engaged with clutches, and can free-spool for running out line. Colour-vomit needs rebuilding, this is prototype.

All major components are modular and can be stripped off the chassis. The front and rear bogies can also be dropped out by pulling 4 pins. This is handy because the powertrain eats gears, and is also snapping triangle liftarms, so part replacement needs to be easy.

It has been tested pretty extensively, for a while I handed it over to my elite tester (2 yr old) to see what he did with it.

Edited February 8, 2015 by andythenorth

[Saberwing40k]

Looks good, although you may need to redesign your axles, if you keep breaking things.

[Coola1]

It's looking good till now, keep up the good work! Oh, and you might want to tell your (adorable) elite tester that he was holding the remote upside down ;)

[__________________________]

This looks good to me! However, I would get third-part RC wheels. You could ask someone else about those, I'm not an expert. (The Power Puller wheels don't look right on this; you should use them on an off roader instead )

[Nalyd997]

So you're not an expert yet your name says you are?:p They aren't power puller wheels by the way

[andythenorth]

Videos of it going over obstacles. It's not built for crawling (limited suspension travel), but it will climb small vertical obstacles.

Obstacle height is limited by the bumper / chassis height, and not much clearance under the steered axles.

Slow: https://www.flickr.c...57633468817167/

Faster: https://www.flickr.c...57633468817167/

And an oops (gets hung up, no diff locks on steered axles): https://www.flickr.c...57633468817167/

@Saberwing yeah, I might rebuild with the portal axle part, if it will fit, or add a little more rigidity to the current design. It's the liftarms that are suffering. Mostly due to raw torque I think - check out the twist in the soft 5.5 axle as well

Edited February 9, 2015 by andythenorth