The dual motors also power the fake piston V6 engine located in the front via a pair of 24 tooth clutch gears. This gave the model a final gear ratio of 3:1 from the dual XL motors. In order to contain the massive torque produced by the XL motors, each independent drive train was geared up 3 times, transferred to the live axles via U joints and then geared down 9 times. Unlike the previous off-roaders, where there were no limits and design constraints, the rules for Rolug Truck Trial stated that maximum of 4 motors can be used, the truck needed a working steering wheel, a fake piston engine and had to 50% resemble a real machine.Īfter tinkering with the various designs, I decided to try an approach with two live axles with independent left and right wheel side drives, which will allow for better cornering, elimination of drive torque flex on suspension and extra redundancy. With no solution capable of correcting the issues, this design was scrapped and I returned back to the drawing board. Having built the chassis I immediately discovered multiple issues related with the gearbox and drive gears slipping under the immense torque produced by two XL motors powered by BuWizz. I’ve made a rough design prototype in Lego Digital Designer before starting the physical build of the chassis. Work started on the most difficult category first – the Truck trial.
With addition of Boats, Sportscars and Battle bots, there were a total of six categories, but due to the constraints in luggage space and lack of large enough boat hulls I had to settle on just three. The two weeks leading to the competition were dedicated to building, testing and optimizing the three competing models, each for their own respected category: Truck trial, Off road and Microracers. Tomorrow I was flying to Bucharest to attend the upcoming Rolug Technic Xpereince 2018. It was late in the evening when I packed up the last model into my travel case.
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