zver’s crawler

I represent the first more or less successful model of crawler!
The desire to return to a theme of crawlers has come after construction of last truck for truck trial (http://www.doublebrick.ru/forums/viewtopic.php?f=110&t=28717) in which it was possible to create successful bridges - compact and reliable. Actually these bridges also have been used in crawler with insignificant completions. The suspension type has chosen three-dot, as most simply realized. Placing of all motors on a frame was the basic moment :)
At first thought out the artful suspension, the first variant looked so:
http://www.youtube.com/watch?v=6xkZJxeGhNU

The suspension course has turned out simply unreal! It was possible to expose bridges under 90 degrees to each other. But has emerged in full lacks of a three-dot suspension - uncontrollable rear bridge steering at overcoming of obstacles. To operate to it would be possible only having made the steering mechanism on the rear bridge, but it wasn’t included into my plans.
Has replaced the big shock-absorbers with rigid beams and has received more or less adequate controllability and cross-country capability:
http://www.youtube.com/watch?v=W9WWHOJamTI

But for such wheel base the center of gravity was too high. I has decided to put larger diameter wheels and to extend suspension levers. Besides it I has moved a worm gear of the steering mechanism on the front bridge, is has allowed to get rid of a car heel at turn of wheels.

This chassis practically without changes also has laid down in a basis of crawler :)
http://www.youtube.com/watch?v=_NBS_uemwTQ

The XL-motor hasn’t so successfully arranged, clings sometimes (on video it is visible), probably subsequently I will reconstruct the motor block. The second M-motor is a crab. Not that it was strongly necessary, but it was necessary to make a counterbalance to XL-motor.