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God bless you my son!

Youre gonna lead me down somw rabbit holes lol

Are you using the airless inserts on carpet?

Very cool, any SCT inserts? Didn't see them on the website.

I had this problem with a Radiomaster TX16S with a Radiomaster Ranger 2.4 module connected to a ELRS RP1 using a Matek CRSF to PWM converter. I was using it with fixed wing aircraft. It would randomly get stuck in full throttle. Failsafe was set to cut. It never lost telemetry, never went in to FS, it just sorta browned out and took off on it's own. I crashed 4 aircraft, 1 almost hit a house going over 120mph! Turns out it was the CRSF to PWM converter that Matek sold since all the aircraft that crashed had this module in it. After some investigation, there was a batch of them that had bad firmware and I happened to have purchased that bad batch. :( The only thing I would try in your case is a different ELRS pwm receiver. It doesn't have to be the ER5C-i like you have there, just find any ELRS pwm receiver with at least 2 PWM channels. Try the BetaFPV 5-channel receiver. You don't have to use a surface radio with an rc car. I use a 9 channel pwm rc airplane receiver in my crawler with the MT12 no problem.

Great video as always. If we used the chassis and flipped the 272R would that work or are holes only aligned with your transmission cases?

Dude! Thanks, I got mine working. Thanks to you!

Wow that's insane, thanks for posting!

Hey Everyone, Nick here. Locking comments on this video and redirecting everyone to my other video on the channel regarding runaways on the MT12. This video is getting too many low effort "did you check the failsafes" comments that are effectively addressed by the other video. th-cam.com/video/QyOxo20-Uuc/w-d-xo.html

I really enjoyed reading the thread about the car and watching this video. Awesome design work and the car looks really good on the track.

You always need to power off your radio and have your car in a safe place holding it. to see where your failsafe is set to.

It looks exactly like what my car was doing, I went straight to the reciever is a lemon and orded another reciever and problem solved. I've gotten a few dead on arrival recievers from various brands over the years but I haven't had one in a while so I figured its just one of those production things that has been ironed out of the RC world, until I got this radio.

Stop using radiomasters reciever. Use any other brand. The problem lies with the er series and the failsafe from my understanding. NOT the transmitter

Can you please double check - I don't see the front bulkhead on printables.

I'm curious if you did a range check and actually tested if a TX loss would still cause a runaway. Meaning stand the vehicle throttle it and shut the transmitter off with the model still going. Do the steer wheels crank one way and throttle stops entirely. If those things are not happening simultaneously then you have it set up wrong.

Dude thank you. My Nb4+ auto power off then power button wouldn't turn it on. Push right side button and it's working again and all settings saved. Didn't even have to take grip off, just pop top part off.

Video is hard to see how the tires perform. Are you able to do a follow up video showing difference in weights of these foams compared to real foams, and maybe a squish test between a foam tire and your airless tire?

I had two runaways on the same day a while back, but both were because I was trying dynamic transmit power. I fixed both by changing settings back, not happened at all since. I don’t currently race but aiming to get to a track in the new year and see how it holds up. I’m still confident it will work for me despite now seeing several videos from a number of users claim it’s “broken”.

It might be too late to help the current iteration, but Traxxas does make 0deg Bandit arms, TRA9430, along with 1deg and 2deg options for tuning the Drag Slash. Bandit lengths, just made extra heavy duty.

Hey Nick, look up the channel “MX acres” he is doing the same build you are doing, but his bandit is for a clay set up

"especially" with ELRS or "ONLY" with ELRS?

Hey everyone! Now that this video has been up for a while I'd like to point something out. Take a look at all the comments - notice how many of them, despite seeing what I've posted in the video - still want to tell me it's my fault or I'm doing something wrong. This includes devs on the main open source projects this radio is based on. If you buy a Radiomaster MT12, have a problem with it, and try to get help with that problem, this is the treatment you will get. You will be told you're doing something wrong, and no amount of proof on your end will ever convince them there is an issue other than your own stupidity. In short, if you have a problem, you will not receive support because they will refuse to believe there is a problem.

All cheap radios are using chips with dedicated programming that's been constant for decades. Nothing new, nothing changes. And you're comparing it to an OPEN SOURCE project? In fact to TWO projects. OK then. I've also read the threads, so I don't doubt you've had issues. But I doubt you understand the first thing about this or other radios - that much was clear on the RCTech thread. Lastly, if anyone actually goes to check on Github, you can see that the drop-out issue is reported in May and closed as fixed in June - both 2023 - based on a report from May 12..

Just found this vid and curious if you worked with devs on this and if there's an update. I have multiple 200+MPH RC Car builds and use the MT12 (with Radiomaster receivers) and have never had this issue. Would like to know if it's something I need to look out for when making updates, etc. Good luck!

Ok so you updated your ELRS firmware? That's great! You realize all of the other firmware on that radio? There is the EdgeTx firmware, there are three different sets of Module firmware, Lua's and all the other SD card contents and none of these play together well when one gets updated but not the others. Your receiver took a quick nap for some reason, those are not hard to diagnose and fix. Start reading up on that radio.

Too much technology can sometimes be a bad thing. I’ve never in 40 years in the hobby, had a runaway car, nitro or electric, staying with the stock analog type radio it came with. Problem is people wanna buy these super fancy expensive digital transmitters and this is what usually happens. That’s a nice looking radio. It’s really a shame that’s happening to you.

What channels were you using in the receiver when you had signal dropout?

Hello Nick. I was wondering what you are running differential wise on carpet. I know you were using the Traxxas ball diff on dirt, but I did not hear if anything changed once you started running on carpet. Thanks in advance and keep up the awesome work.

hey I am looking at the step file before I order my carbon fiber sheet. is that the hole size for the actual bolt and I need to counter sink them manually?

Did you 3d print the transmission

Def enjiy the updates and seeing yhe iterations improving things. Keeps up the awesome work!

Comment for the algo. Keep up the good work.

Are you using internal shock limiters? They help a lot in the corner grip and preventing traction rolling.

You sir are amazing. Love your progress on this and the shared files.

This is the receiver issue. There th-cam.com/video/OfxvGxojPYc/w-d-xo.htmlsi=jqV_vfQKWhrOtO8q (Somewhere in midle) You can find ch1 and ch2 waveforms while power on procedure. It is really strange behavior, but explains that happens:( seems right way is using ch3 as Throttle channel, neither ch1 nor ch2. And probably to config motor control to use some arming sequence if possible. This is defenetly bug in fw. Elrs is more complex system to compare with cheap rx/tx and more easy make mistakes, but elrs and edge tx have more feture and flexibility.

Im sort of interested in this project, for the price of a donor bandit are going for here you might as well just buy a B6.xx . Hopefully one comes up real cheap. What are you guys paying for them? Is the stampede & rustler the same chassis? good work!

Could it be a malfunction in the transmitter throttle? Ie it’s sticking in full throttle?

This is why I run a Dumbo or a GT5. Never had any problems. Have fun with you super complicated radios!!!

For the rear arms I would look into the drag slash arms for toe in they have ones that are 0 degrees in too -3

It sounded like you lost telemetry / connection between transmitter and receiver. There are 2 possibilities, 1 transmitter lost connection, 2 receiver lost connection. What’s strange is either way, the receiver should have a failsafe mode that puts throttle at 1500 center / off. You can test this by having the car blocked up and go full throttle while removing the transmitter battery. If you get throttle runaway then your receiver failsafe is not correctly set up. Now as for the signal loss there is a question of what receiver are you using? Sorry I didn’t read all posts. Some receivers require RF Frequency Fine Tuning. See if that is available on your internal RF settings.

You may have watched this before, but maybe it might help, around the 9:55 mark he mentions the failsafe settings, th-cam.com/video/OA7FozAr2S8/w-d-xo.htmlfeature=shared < I understand your frustration in that you were ignored on github, but some of the people who've commented in this chat are genuinely trying to get to the bottom of this problem and help. It may well be a hardware fault, but if it were me, I'd explore every avenue before I sent stuff back asking for a refund. Good luck Nick...

I ended up selling mine too. Used it several times and had the exact same signal drops. I wanted to love it, but couldn't. I used it indoors (at Richfield) and had signal loss even at those close ranges. Another thing I hated was that once powered up it would sometimes take forever to link , even though it was already bound. Their air radios seem great though!

*1.* Do you have 3-gear and 4-gear options for low/high inertia (basically allowing the motor to turn same direction or counter direction to the wheels)? *2.* Have you considered a rear motor but with the battery placed where the speed controller is, the speed control between shock towers? The idea is to get the CG the same as a mid-engine, but have more inertial mass on the back to assist rotation since car handling (simplified) is based on rotating about the NON steering axle, and having leverage on both sides of said axle will improve it. *3.* Have you ever heard of a De-Dion axle? If not, look into it. It's a sort of in-between of solid axle and IRS and I think it could both drastically simplify rear suspension geometry tuning and even give you a bunch of rear grip, particularly if paired with a Satchell Link and if you have static camber and toe shimming built into the axle. Even crazier would be adding a camber link and lower hub pivot to facilitate that. Just be sure that if it's a plain camber link you angle it down toward the chassis so you get the camber gain leaning INTO the turn on BOTH sides during body roll for max grip.

i would drive one of those trucks but i dont have the skills to wrench on them though, i open something and bits flop out all over the place, i dunno where they go etc, plus i dont have a 3d printer and id have to learn all of that on top of how to install it myself, but i suspect this wouldnt be for a guy like me anyways, i def want a mid motor rustler tho, it's just beyond my abilities to do it myself. buying is difficult also cuz custom work isnt cheap i'm a broke scrub, but thats on me lol

Same here. I have destroyed 2 cars this week. One with the 3 channel and one with a 5 channel. Also did it a few times in my trx4 with the radiomaster 8 channel, thankfull he is slow enough nothing was destroyed.

Same issue here wrecked a mini b and a stampede this week. Happens inside and out. I am using the elrs version of the mt12. And 3 4 and 5 channel radiomaster receivers. Love the transmitter otherwise, but I expect to stay in control this is not acceptable.

Call warranty , had siimilar issue with traxxas, after turning on it started to ride on ita own

Antenna routing🤠👍

I have the 4 in 1 version and had my 5th scale Kraton 8s runaway at full throttle once too. Lucky for me my neighbors tree stopped the truck from moving forward, but I had to do a little lawn repair where it went full gopher until I got to it and decided how to address that situation

Hi, those tpu rear arm mounts, did you print them on a 45º angle, %100 infill? Nice job, thanks