Lego Technic SUGV (Small Unmanned Ground Vehicle)

[DLuders]

xyzzzach had posted this

of "the Army's SUGV (Small Unmanned Ground Vehicle) so here it is in Lego format. A normal [robotic] tank would spin out when reaching a cliff front twice the height of its tracks but this one pulls it way over, as you can see. Not the coolest or most complex but fun nevertheless."

More recently, Legotechnicalities was inspired by xyzzzach's video and posted this

of Lego Dual Worm Inline Gear Box design that he's planning on using on an improved SUGV version (photo-sequence Building Instructions on his (Dirttraxx) Brickshelf gallery):

[Zerobricks]

That dual worm gearbox seems horribly inefficient. Each worm gears looses 50% of energy, so having two means he will loose some 75% of energy...

[DLuders]

Maybe if he used a more-powerful 99499c01 PF L-motor (instead of a PF M-motor), it could overcome the friction....