I created a separate video with the following setup – 2 buggy motors + BuWizz + SBrick and controlled with an Android-compatible game controller through the great SBrickController app of imurvai – you can find the link to the app in this Eurobricks forum thread.
I was not aiming for maximum speed here as the power output of the BuWizz unit cannot be changed (yet) when it is used as a power source, but personally I still prefer physical controls so there it is 🙂
You can see in the video how the app is configured. As I could not use the known setup of the SBrick app for tracked vehicles (joystick controls turned by 45 degrees) in this case, I assigned the forward/backward movement to the left joy, and the left/right turn to the right joy. The commands are somehow overlapping I suppose but it still works pretty well 🙂
I received a great suggestion from the Eurobricks forum – test the 42065 RC Tracked racer with PF Train motors. Their rotation speed is almost as high as the buggy motors, so definitely worth trying.
Here is the quick setup I created:
Based on my tests the speed is pretty ok – definitely faster than the M motors, but not as fast as the buggy motors. Unfortunately the climbing abilities are not that good, the PF train motor starts to slip quickly when it is loaded. The maximum slope it could climb was around 20 degrees only, worse than the M motor version.
The speed could be increased if I would install 2 additional PF train motors, there’s enough space for them if the power source is moved. Unfortunately I don’t have two more, but I would be happy to see that configuration if any of you have the necessary amount of motors 🙂
Thank you very much for your nice feedback on the previous post & video, really appreciated! Most of you were interested in the details of the 2 buggy motors + BuWizz configuration, so here you go 🙂
You can find below some detailed photos of this version:
On the last one you can see a previous version of the chassis as well. I tested the setup first with the lower-speed output of the Buggy motor, this way I could keep the original hinge for the body. I could not resist to stick to the higher-speed output later 🙂
The Lego 42065 RC Tracked Racer is a pretty cool set. You get remote control capabilities out of the box – all Power Functions components are there for some real RC fun. There were some previous RC Technic sets produced by Lego, but they had a much higher price tag.
Although the set is fun to play with by default, there’s always room for improvement with Lego 🙂 I really wanted to know how much I can push the limits of this vehicle. I quickly realized that I cannot have everything in one package – I can aim for climbing capabilities or for speed, as they require a different setup. I tried to keep the overall look and structure of the original version, only modified what I really had to to be able to fit the bigger motors. Finally I came up with quite a few versions, you can see most of them in the video:
The different incarnations you see are:
2 M motors with Lego PF AA battery box & IR reciever (stock version)
2 M motors with BuWizz
2 XL motors with Lego PF AA battery box & IR reciever
I used two types of tracks on them. The first is the standard one, the second had rubber attachments (#24375) for additional grip. Based on my tests the rubber attachments did not add much to speed with the standard PF motors, but the improvement was noticeable with the Buggy motors (it was quite slippery without them at high speeds :)). As for the climbing tests, they clearly had an advantage, so they were used for all of those tests.
So which one is the ultimate version? The quickest is definitely the 2 Buggy motors + BuWizz combination, the top speed is around ~12 km/h versus the ~2,5 km/h of the stock version.
I had high hopes for the monster equipped with the 4 Buggy motors and 2 BuWizz units, but I quickly realized that with the current BuWizz application it’s almost impossible to control it – as you can see below I’m not the best at playing piano either, probably that’s the reason:
I’m sure the situation will improve when the application will be upgraded with the option to edit profiles and control multiple units on a single interface. That will help with the control, but I don’t think it’ll improve significantly the speed, so apparently Colin Chapman was right – less weight is better then more power 🙂
I tried to solve the current shortcomings of the BuWizz app with 2 SBricks, but apparently the high speed output of BuWizz cannot be used at the moment with the SBricks, so I could not test the full potential of this setup. It still looked very convincing 🙂
Regarding the climbing capabilities, the winner is the XL motors + BuWizz combination, beating an impressively steep ramp (around 50 degrees)! But I also have to mention that the “classic” Lego combination of the XL motors and the Lego Battery Box almost performed as well (around 48 degrees), so you only have to swap your M motors with XL ones and your racer will be ready to climb!
Let me know your thoughts in the comments, please also tell me if you’d like to see more pictures or videos about these mighty racers 🙂
This will be my digital playground where you can follow my experiments and adventures involving Lego building, photography and videography. As the name indicates, everything will be related to vehicles! Expect to see cars, trucks, buggies, garages, racers, even tracked racers (spoiler alert) 🙂
I have tons of exciting things coming so stay tuned!