LEGO Weak Tractors - four small vehicles on tracks

Four small weak tractors on tracks made from LEGO Technic with IR RC. Comparative test runs on grass and snow.
0:00 - First with speed-boosting gearbox
1:59 - Second has highly accelerated gearbox, fast
3:20 - Third with step-down gearbox, slow
7:25 - Fourth with lot of motors and gears, sluggish
The last one with 5 motors was half of an articulated 10-motor machine, but the idea turned out to be unviable, sorry.
#lego #funbrick #legotractor #legotechnic #engineering