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[MOC] 34,8 km/h worlds fastest LEGO-car (2 motor version)
TechnicSummse posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Finally i found some time to present you my latest MOC here. -> the 34,8 km/h black speed record racer It is the fastest 2-motor LEGO-rc-car until now (june 2017). While developing i was aiming for the highest speed you could reach with only 2 buggy-motors. To reach the goal, i had to: - reduce weight as much as anyhow possible - reduce the rolling resistance as much as possible (using only 3 as thin as possible wheels [only frontwheel could be better for indoor use: 2815 + 4185, but doesnt work outdoors]) - reduce axle-beam friction; just 3 studs in total (5 to protect the motor bearings) - find the best gearing - reduce air-resistance, and keep center of gravity as low as possible -> so here are the specs: Including panels in studs: length 55 , wide 21, height 12 (wheels) -> weigth: 650gChassis only (ready to race) : length 42 , wide 21, height 12 (wheels) -> weigth: ultralight 621g (without speed computer)Ground clearance: 0,5 studsGearing: 2:1 up at the fast output of the buggy-motorsTop speed: 34,8 km/h I know some of you dont trust the LEGO-speed-computer, so i also didnt at first. I startet measuring with gps with my heavy weighted mobile phone (more then 150g), but i didnt like the idea, to add 25% of weight to the model just for speed meassuring. Thats why i decided to buy a speed-computer (21g) [ could get one for 15€] just to try how accurate it is. And SURPRISE... it is really really accurate. I made a lot of comparing runs with GPS-phone (speedo app in 1 second mode) AND speed computer together attached to the car. The biggest difference i could ever meassure was 0,3km/h. You can see some pictures of this at the end of my video. (In my next video i will make some videos of this, not just pictures). Here are some pictures and the building instructions as Lego-digital-designer-file: https://rebrickable.com/mocs/MOC-8658/Summse/348-kmh-black-speed-record-breaker-worlds-fastest-remote-controlled-2-motor-lego-car/#comments I hope you like it :) TechnicSummse And finally here is the video :) -> Its the first video i ever made