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Motorized Yellow Tumbler . There are too many Black tumblers. So i made yellow version tumbler (In fact, i didn't have sufficient black bricks :-)) Anyway, my yellow tumbler has the steering system, the rear shock absorber and the 3 states transmission. The 3 states transmission is made using 1st generation lego power function system, as you know, the system has a disadvantage that the power function motor runs only one speed. Because the remote controller has just on/off switch. So, the motor can not run various speed. (But, next Generation lego power function, solve the problem. LEGO made new controller can be control various speed) I made the 3 state transmission, using a differential gear and two lego XL motors. It's a really simple and easy structure, but effective system. The transmission has 3 states. First state is 'IDLE', 2 motors run at reverse direction but wheels rocked. Second State is '1/2 Speed', 1 motor runs and the other motor stops then wheels rotate at half of maximum speed. Third State is 'Full Speed', 2 motor run at same direction the wheels run at maximum speed. Enjoy watching~ . End.

LEGO models my own creation MOCpages toys shop

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