Project 250mph Quad Motor RC Car 1st Drive

so much work went into this build, respect! manifesting that you break the record!

This is the content we want to see. A build like this is out of the reach of most of us, so keep up the good work Kev.

Kev you achieved a power to weight ratio of 2.5 which is insanity in the world of racing and I’m impressed

This is the content we want to see

Even if it didn't break records, you should still be incredibly proud of it. The level of detail and craftsmanship is truly remarkable! It's an absolute masterpiece. 👏🏼🔥👍🏼 Don't let the absence of a record diminish the incredible achievement and effort you've put into this project. It's an epic creation that deserves recognition and admiration. Keep pushing the boundaries of what's possible! 🚀🏎💪🏼

This is such a good video kev! Love hearing all the potential issues and how you’re going to solve them. Often happens in RC but maybe not 10 solutions back to back like this!

If it didn't break records you can still be proud of it, it's looks absolutely epic!

🔧🚗 To enhance the suspension's effectiveness, consider adding square sections along the chassis to boost its rigidity. This modification can significantly improve performance. Additionally, reducing the frontal area would enhance aerodynamics. Love the exciting progress of this build! Can't wait to see the first drive! 🏎🔩💨

You really make working on things look easy! This was definitely a lot of work! Makes me work on things better! I always think to my self when in a jam… what would kev do?…he’d get it done! Good luck! Hope you get the record.

Hey Kevin, has anyone thought of using polyurethane cylinders as a spring? I was just thinking back in the day Manitou and Rock Shocks had elastomeric damper systems in their forks (many others actually) and worked pretty well.

AWESOME build! I must admit I was skeptical about the long wheel base, but full credit to you for making it work - very exciting!

Hey Kev, would that centre driveshaft really have much load on it when both front and rear pairs of motors are running? I feel like the length might be fine since there is only minimal "sync" load

Kev, if you get a good 3d scan of the car I can run some CFD on the design. I think the person who really takes that seriously is going to be the first to 300mph+ (note I am not an aerospace engineer, but I do work for the company that makes the software and i have used it a good bit.)

Honestly - it looks good. Have you tried it in a wind tunnel? Tinker with downforce wings. I think a thorough analysis by an engineer would go a long way. Also, full scale LSR cars always spend an enormous amount of time getting the wheels right. There has to be a better alternative than foam. Also do you use a gyro? Great project!

Can't wait to see the final speed run Kev! Thanks for making RC so much fun!

Love what’s been put into place looking great, can’t wait to see more on this build.

We really have to appreciate how good this guy is at his job

This channel is the ultimate "What would happen if I did this? Let's find out!" RC channel

Your dedication to your work is commendable!!.... Lots of love and support to you brother... You inspire many people around the Globe...

This is totally badass! I have no other words to express how exciting this is! Good luck Kev!

Awesome Build my friend! I thought you was going to smack a curb in that test run lol, but you did great! I cannot wait to see this full speed!! That record is about to get SHATTERED!!

This is definitely going to make a good run at the speed record which as I believe now stands at 219mph. I think you have a real shot at it, the HP to weight ratio looks good and aero wise it seems to have handled the 77mph pretty well. Good luck!!

Kev, I think that the aerodynamics will be very important at this speed. Would it not be worth having a custom body molded so that there are no joins? I worry that even a tiny amount of irregularity will cause asymmetric forces and boom, it's crash time.

You’ve got to bond some square section along the length of the chassis to make it stiff enough for that suspension to actually work .
That frontal area could be reduced a lot. Love this build.

Hi Kevin, new to your channel, I like all the effort you put into your videos, you got an awesome collection 😀👍

This is by far the most exciting build I've seen! Fingers crossed for you Kev!

HEY KEVIN, USE POLYURETHANE SPACERS IN PLACE OF COIL SPRINGS. It’ll give a little and you can ones with different durometer ratings to fine tune it. Idea just popped in my head. They used to use these poly “springs” in mountain bike suspension. It consisted of multiple cylinders made out of polyurethane that took place of a coiled spring. Might be just what you need to keep her right side up.

You should try using the ABS function in the radio. It pulses the brakes at a variable PWM frequency and makes braking from fast speeds super super smooth and straight.

For soldering the battery connectors, search your favorite place for soldering pliers. There are many different brands but most all look similar. Maybe with a little modification they could hold the battery connectors for soldering. They are super handy for wire to wire soldering so either way they would be useful.

Something too think about is that the farther back you have your center of pressure the more it will want to stay straight, increasing that pressure would be like adding more fins or adding a small wing to the back, or you could try and decrease drag at the front of the car. I hope this can help if you need it, otherwise you can look up some stuff about rocket aerodynamics and how they stay straight.

Kev, I've been watching you only for the last couple months. Thank You. I bought my first car last week because of you. Armor Vortex BLX. I can't wait to see your first runs with this beast. Best of luck bud.

Absolute Madlad. Long live The King Of Fun. Kev- you could use photgrammetry software like Agisoft Metashape to make a 3D model of the car, then you could use AirShaper to do an aerodynamic analysis of the car, and optimize the vehicle for high-speed drag reduction.

Yes, two lengths of 1/8" X 3/4" X 3/4" aluminum side angles would stiffen it up a lot. No rear motor hold-downs worries me a bit.... lots or torque there. And for what it's worth I'd use low-temp silver solder for the connections.

15:46 I suggest putting the Dual Lock stuff on top of the batteries, get a long strip of carbon fiber (the same width and length as the batteries) and stick it to the top of the batteries to help stiffen it a bit more.
Also, the idea of having the rear higher than the front, like the 2020 Red Bull F1 car is a very good idea. I think you should consider it.

Kevin
Keep up the good work. My son and I love the mixture of material you publish. Keeps it interesting and keeps us laughing.
We do a lot of indoor and outdoor racing so we love the racing episodes.
More 1/8 scale competition racing would be nice especially nitro.
Fans would see what it takes to race nitro.

I’m absolutely loving this and can’t wait for your WR attempt! I would still run carbon angle down both sides of the chassis, screwed and epoxied, as well as the center brace. It would really suck to break this thing in half after all that work and money. It would also allow much better body mounting down the sides. Without this, even if the chassis didn’t break in half it could still be catastrophic in the middle of a run if the belly was slapping or dragging on the pavement. This is one heavy beast! Very best of luck and Godspeed!

Holy steamer Kevin lol I haven't checked in for quite a while and, judging by the thumbnail, it appears you've taken this project to the next level and beyond hahaha.
No one can ever accuse you of doing things small!
This should be interesting.

Speed record goes up, but Talbot doesn’t back down! So glad that i am watching these videos as they are coming out. Makes me feel successful watching you chase your dreams! ❤

back in the day for on-road 1/10 oval cars, we ran rubber cap tires. it was a foam tire trued way down then a rubber skin glued down over the foam. Like cutting a section of an inner tube and stretching it over the foam. They were very durable and would keep tires from exploding. Also for low drag race cars, we would use some thin delrin material on the bottom of the chassis to keep from damaging the bottom and it's pretty slick so it wouldn't slow the cars down as much as dragging the chassis. Now you could probably use some Star Board.

At this point, I think Kev should go for World's Farthest/ Highest Jump..
Build a huge ramp and launch it into orbit

With a dart, you want all the weight at the front because it’s the inertia of that weight that is moving the dart through the air. Once the dart leaves your hand there are no forces (aside from aerodynamic drag) being applied to the dart, it’s just the momentum of the mass. If that weight is towards the rear and the there is drag at the front, you end up with an inverse pendulum effect, it wants to tumble. With your car, you are constantly adding force and not relying solely on momentum (unlike if you had launched it from a slingshot or hotwheels launcher). In your case you want all the mass out at the extents of the car to create the greatest most stability. If you put all the weight in the center, the car turns very easily, put it all at the front and rear and the momentum of those two masses actually helps to resist the car changing direction, ie it becomes more stable at speed.

This is a fantastic project Kev. Really looking forward to seeing more of it. if I was doing this, (ha ha yeah right) I'd put some kind of angle section aluminium/carbon fibre on the edge of the chassis to help stiffen it.
I think you may need to put some kind of protector on the bottom. Awesome that Raz is helping, and have you seen that lad who had the jet car last year, his new project? It's awesome.

I've been a fan of yours for a long time now Kev, hope u get the world record with this car🤞✊

You could use a pivoting front splitter connected to a micro servo and gyro set in heading hold mode. If the front end lifts the splitter will tilt down to force the front end back down. A lot of work though.

Not so long ago RC cars hitting 150MPH was absolutely mental.. now they are going towards 250mph.. Technology is advancing so quickly, and im all for it! 🏎
World record or not this car is epic! Altough, i do think it its is capable of a little 225 here and there. Lets hope!
You really need to sort out the balance of the car though.
But thats where trial and error is for i suppose.
Good luck on the speedruns Kevin!! (Just dont SEND IT TO THE MOON just yet. 😄)
PS : These speedrunning videos really get my hyperactive brain going.. I'm going to build something too. Just a way smaller scale. For the funs.
Setting goals, breaking my own records.

Your videos are always fun to watch. Thank you Kevin for uploading and for the entertainment :)

Damn bro I really hope you break the record this is an impressive build and I wish you the best of luck go Kev!!!

and here I am thinking 50mph is wild 🤣🤣
but seriously, that build looks wicked Kev, wishing all the best in your speed record attempt!

Some fly fishing desk clamp stands are great for soldering and have adapters to use loads of different tools. Keep up the good work!

You know? Its about time us dudes enjoy some of the toys we worked so hard to get.
Love how things are really going big for dudes out there having fun!

Amazing build! Excited to see it break the record. 😎🤙🏽
Best way to tidy up the wires if you don't want to shorten them, is to wind them tightly around a thin screwdriver or allen wrench. Then you pull the screwdriver out and the wires are nicely pig-tailed.

Do each of those motors actually output 18.75kW? That would be 100HP. If so, that's insane.

just an idea kev, so that the chassis doesn't sag so much maybe stack the batteries on both ends, and then there won't be as much weight in the middle. it just might save the car whilst driving. also thank you so much for releasing this video, we've been waiting for so long! keep up the good work man!

I never realized this goes faster than real cars and also as fast as some supercars.

Never thought I'd see Kevin with xlx2s again after the initial flaws. Good to see he's giving them another go

Beautiful build Kev. Well done.❤

This is going to get the record as long as it doesn’t blow up, but Project Air’s 2nd gen jet car is also looking promising.

The power of this beast 😮 can't wait to see this thing fly.....or fry 😅 awesome work kev

So amazing😮. 1 tip, if you put stronger springs on it, you also need to put thicker oil in it. Because of the bounce back. Stronger springs wil bounce more, same feeling as you do to much air in your tires. You get much vibrations.

I would think the rear anti-roll bar would assist with squat during accel, and the front would assist with diving while braking. Of course, stiffer springs can do this function as well, for a straight-line car like this that doesn't need to worry about under/oversteer balancing.

Hey Kevin, long time watcher here! If you're looking for the PERFECT 'helping hand' get yourself a Mag Base - they're used in machine shops a lot to hold dial indicators. They're easy to manipulate, and the arms lock in place.

Hello Kev! I just bought my first RC car and got a motor, a Lipo, and an ESC to mod it. But when I got the actual car, the car was a little bit too small to fit the Lipo I bought. My plan is to design and 3d print a body, but since I don't have much experience with RC cars, I am not sure if that is the best idea. My other problem is that it looks like the ESC and the receiver are connected. Does this mean I need to buy a new receiver, and would that also mean I need a new transmitter, or is there a way around this? Thank you!!!

That thing even sounds fast! Would be amazing to see it go down the strip at santa pod. Good luck with the world record attempt kev!

I'm actually more interested in the amount of HORSEPOWER this beast has in it than i am the speed it might achieve. 💪 AWESOME BUILD MAN!!!

If your motors are all spinning in the same direction, it will probably twist the car chassis in the opposite direction and put unequal pressure on tires. Loved the video, by the way 👍

That looks epic Kev! Cant wait for the speedrun attempt!

That rig is absolutely wicked! Great work Kevin! That’s some serious speed!! 😮

For the drive shafts, I thought the drive pins should be oriented 45 degrees to prevent the oscillation that they can develop..

What kind of gear ratios are you using? Have you done an analysis of RPM needed to go 250 mph? Curious what the calculations look like.

Looking good kev... Can't wait to see it rip.... If the top deck. Isn't enough on its own to stiffen it you could bolt an angle Or box section across the top of the brace to stiffen it 👌
Roll On rossa😎

A thing that came to mind with this speed run attempts that could be helpful.
Tires seem to be a point of failure for most attempts regardless of car style and type. Mostly with chunks coming out of them. I wonder if it would be worth hiring a road vac for the day to clean up the dust and pebbles on the road surface to save the tires from getting pierced and cut saving them from cutting the run short? The cost split between the event competitors wouldn't be to much and with a premium event surface would maybe bring out more competitors.

This battle for speed in the RC car world right now is fascinating. The clash of high end technology mixed with a "screw it, let's see if this works" mentality is amazing to watch. I wonder how long it will take until someone really takes a solid look at the aero design or they get a new wheel that doesn't disintegrate and has the right friction properties they need.

I’ve been watching this channel for ever and every video is Better and better whether it be a vintage rc car or the world’s fastest rc car keep it up love the channel

I've been thinking since the first video; you should add another body mount cross beam in the middle of the chassis. If you are putting on top longitudinal bracing, I bet you can attach it to that. I could really see that span of body wanting to cave in at speed.

Genuine question: With all 4 motors spinning the same direction will you get torque roll like airplanes get?

Additionally, have you considered using two different Kv motors instead of two of the same? As it stands, the limiting factor for top speed ( assuming you are stable) is when the motor can not put out enough force to accelerate the car any further. This happens because of back-EMF as you get higher in a BLDC motors rev range. The idea here is that you can have two motors together to extend the torque range of your system. In an ideal world the first motor tops out as the second motor nears its peak power.

I love the common sense engineering. I do the same thing with many of my random projects. One suggestion on the aerodynamics for the chassis that may be worthless or not. Take the reaming bit and simple the whole underside of the carbon fiber. Yes it will lose rigidity but bracing can fix that. What it does is disturb the air under the car and create suction at high speed. It allows more air to pass thru faster thus creating downforce. Maybe try on a backup chassis?

You can't judge a fish by it's ability to climb a tree,, Classic Kev,,,I hope you get that world record,, keep up the great videos

For soldering I use a magnetic clamp for each ends. I work on pickups not RC stuff but it’s worth a try

I wonder how the m2c arrma pistons would do for speed running? Maybe flip them upside down and use the shock fluid as more suspension to keep it stiff but now solidly linked together.

Awesome build kev. You are differently going to get a good number, great job my brother, I ❤ it...😁💯👍🏿

Nice work brother! Can't wait to see it smash the record, I'm predicting 230mph!!

WOW! That MUST be it, I am so exited Kev! All the best of luck for the next proper run! 😘😘

With the solid centre drive shaft, kev could make a bearing carrier anyway to stop it flapping.
The car looks like a great recipe for speed though, the longer the wheelbase, the easier to keep going straight .
Kev's reinvented the limousine. 😅

Hey Kevin, I’m your fan from Malaysia. We use lots of your videos as reference to make our RC faster 🔥🔥🔥 more fast more fun!

I'd mount the motors in opposite directions so the torque from the motors to the chassis cancels out. Right now, all 4 motors are trying to rotate the chassis side to side whenever you hit the gas/brake. That's likely why it turned right when you hit the brakes in the video.

Wow that is awesome, has to be scary as hell to run something like this, genuine road rocket 😮, good luck!

Kev, I recommend using a much smaller pinion gear on those Motors.
These 2028 1700kv are absolute Esc Killer, if not geared Properly and handeled with care, and check your Logs.
Good Luck 👍🏻

Awesome build! I can't wait to see you break the world record!

Kev, I have an advice for you, to get the downforce that you need, ask to the company that made the carbon fibre chassis to make wings for the downforce.
These wings have to have the shape of an upside down airfoil so, the upper part of the airfoil generates a higher pressure than the lower part resulting in downforce

Active aero (spoilers) might work if the car tends to get loose and lose traction. The RC tires are the weak point with or without any increase in downforce. Laser alignment on the drive chain might free up a few electrons to the roadway.

my favorite helping hand is the magnetic base version. has a big metal plate for a base, with magenetic mount movable arms. you can make your own custom arms if you need.
its great.

Kevin is the type of guy to build the fastest on road car and then never launch it off a ramp...he's really soft like that

Gotta get it this time Kev! If you do not you might need six motors LOL!!! You should use that plastic sheet that carpet racers use on the bottom to smooth things out, make it slippery and maybe keep the carbon intact. IDK I have never tried building one of these but super cool!!!

More power is always nice bro. But Aero is also important for speed.
I can see two big places where you could gain more power efficiency without adding much weight. Wheel wells and the back of the cockpit.
The wheel wells are open to the external air, allowing flow inside the body, which then becomes turbulent and slows down the car. Placing a barrier behind the wheel with a cutout for the axel could help prevent this and encourage air to flow around the body in laminar fashion.
Behind the canopy a set of vortex generators would encourage vortex formation which would create a boundary layer of turbulent air across the top of the body. Vortexes allow the car to move through laminar flow more efficiently by preventing laminar airflow along the body of the vehicle which reduces drag.
You might also be benefitted by covering the wheel spokes of the car.

Randomly discovered your videos a few weeks ago.. so good.. love your editing style and your personality. Great vids mate!

when you're drilling through metal or composite, start with a super tiny drill bit, then step up to the diameter you need, this will make your large drill bit not track on surface/ make your holes more precise.. love u kev!

You may just need some 45° supports attached from the floor to the cross-brace to hold it straight as an arrow. Maybe one perpendicular to the others as well for the sides to keep them from flexing too much.

Nice build, looking forward to seeing it go full out.

As an fpv quad guy, my brain glitched seeing those ESC's. Good god..😮