Search the Community
Showing results for tags 'brushless'.
Found 4 results
-
Speed Limit of Lego (68.8mm wheels, regardless of motor)
PorkyMonster posted a topic in LEGO Technic and Model Team
Chanced upon this video while browsing youtube just now... I'm not in any way promoting the use of 3rd party parts () here (it's individuals' tastes after all), but I thought this video pretty much gives a rough gauge to all of us what pure Lego, when combined with brushless motor (i.e. no lubrication, no bearings, no other metallic 3rd party hobby-grade RC structural/mechanical components), can do... how Lego parts (especially differentials and universal joints) survived at such speed, for a roughly 1 kg model (my own model weighs 3 kg and if I accelerate it hard, the rear-front-middle differential and universal joints will complain)... and the control range to be expected using rc-grade transmitter/receiver. and if the speed claimed is accurate, the 68.8 mm wheels would have to be spinning at close to 6k rpm - depending on weather conditions this is probably the top limit before Lego axles melts (this limit will go down the heavier the model is). -
Turning a LEGO boat into a (super fast) RC car
janssnet posted a topic in LEGO Technic and Model Team
Hi folks, This is not for purists. Contains modified and non-LEGO parts. My urge to build a super fast LEGO RC Car often stopped at the stage where the body needed to be build. Seeing all the great designs on forums like this, it somewhat discouraged me building my own. Besides the fact that these bodies come with some weight and will not hold a crash a higher speeds, I had to come up with something else. As a result of an earlier project (building a fast LEGO boat) a had some damaged LEGO Hulls (54779). Since a car body works basically the same as boat hull (but 180 degrees rotated), I thought I'd give it a try. Have a look at the result in the YT video. It works fine. Gives strength to the car, the aerodynamics work well for good driving stability and it is not that ugly :) Called it The LBOW (Lego Boat On Wheels). Included standard RC components: ESC, brushless motor, 3s Lipo battery, digital steering servo and .... a Gyro. Resulted in a very fast RC Car. Theoretically this should be able to reach 100 km/h. Speed test will follow (need to find a good track first). For those trying to do similar things, I'd strongly recommend to add the Gyroscope to your car. It prevents the car from breaking out at higher speeds. Very useful. -
Inspired by Lego's Ferrari 599 and Enzo models, I've created something 'beefier' . Main characteristics: Measurements - 50 cm (L), 25 cm (W) and 15 cm (H). Weighs 2.5 kg. All wheel drive (AWD) with 3 open differentials. Full independent suspension. Steering - KPI, Caster, Progressive Camber, sharp steering up to 40 degrees. Towerpro MG995 Servo. Powered by a brushless 4370KV motor at 9 volts . For fun and laughter .
-
Hey Guys, In this thread I'll introduce my race/trophy truck It features caster, kpi, long-travel suspension (front independent, rear fixed-axle) with damping, RWD, manually functional LED lights, hood, doors, extendable door steps, and moon-roof. Rather sizeable, at 4kg, and 65 (L) x 31 (W) x 30 (H) studs in dimension. Weight distribution is 50:50. And here's how it looks underneath... There was no modification to LEGO pieces, and no 3D printed parts were used. However, I've opted to use 3rd party components (mainly the electronics) because where I live, TLG does not deliver. There is a local shop selling LEGO stuff, but is often poorly stocked when it comes to Technic/PF components. While I do realise that these won't integrate readily with LEGO Technic pieces, and wiring will be messy, I was willing to give it a shot because they offer better performance and configurability. I started off wanting to include a gearbox (at least semi-auto if possible), camber and ackermann, full independent suspension, 4WD, etc. But as you'll see in due course, I encountered challenges either directly or indirectly due to my use of 3rd party components . I will provide more details about these later on. For now, suffice to say that there is some sort of a dilemma here - With LEGO PF, I can probably incorporate all these features, but I'll end up with something that drives like a tortoise (which defeats the purpose of having these features in the first place). However, with 3rd party electronics, I'm able to drive much faster, but that also resulted in the need to build a stronger model to withstand occasional crashes, and stronger drive-train to handle greater torque, and all these bits and pieces add to the resulting weight and size (don't forget that I need additional pieces to act as 'bracing' for the 3rd party electronics too). More details later on... For now, I've prepared a short video: In subsequent posts (assuming that there is sufficient interests), I will describe the challenges that I've encountered, and how they contributed to my current design decisions. Roughly, I'm thinking of elaborating on these areas: - Steering Axle/Hub Design (including how I incorporated a 3rd party servo) - Drive-train Design (why and how I gear down the brushless motor way before the wheel portals) - Suspension Design (why do i use this part, among other things) - Any other areas that you guys want to know more about...