The rear wing is ineffective for a couple of reasons. What happens is the bodyshell is displacing the air at speed making the wing do absolutely nothing. If you raise the wing and also put some angle on it so it creates more downforce you'll find it'll run a lot lot better because when the car squats, its flat meaning its doing nothing.
Yeah, I agree. To go this kind of speed it would probably be worth putting this thing in a wind tunnel of some sort, even makeshift. Between the position and angle of the rear wing and the hard edge at the back of the body, I would be willing to guess that you are actually creating a low pressure zone behind the rear wheels and either not creating downforce and maybe even a little lift which is why the rear end is acting so loose. Good luck, that is a rad car!
Gonna have to machine you're own shaft 👀 or talk to someone about it Sounds like an opportunity to hit up one of the awesome machinist youtubers out there ThisOldTony perhaps?
All part of the game! My dad and I built a 2000hp chevelle that weighs 4300lbs which is really unchartered territory for most parts stress wise. Every time something breaks you make that part stronger or find another solution until you’re left with a solid platform. Soon you’ll be left with a car that can handle even more power than you have in it now. Keep it up 👍🏼
Set dual rate/expo and also end points for less responsive steering. I would also try spool in front in case you have open diff. Keep posting, this is really interesting to see and professionally done 👌
Have you tried a different body just to rule out down force issue. The rear axle seems to handle the power. Maybe something else caused front driveshaft issue. 🤷🏼♂️ good luck
Wow! Yoga blocks. Love it! I just ordered a couple. I recently bought the “rotating thing”. It’s okay, but sometimes I have a couple of projects going on at once and also, the rotating thing isn’t all that stable. Great tip!
Wow this is absolutely crazy. I love it!!! Only thing I suggest is getting a nice camera. I see you're relatively new to youtube, so having a nice camera image could help you gain subscribers. People like to see a resolution. The GoPro is good but just doesn't compare to other cameras. Anyways, keep up the great work. I'm excited to see what becomes of this RC car and channel :)
The broken diff aside, have you run this car with the Toyota GT or Jaguar body, would be interesting to see if you had the same stability issues as with this carbon body
Wow man, once parts stay together your gonna blow that 149 away. Must be so frickin crazy trying to control an rc at those kind of speeds. Good job man cause it would most likely be in pieces if I was running it. Nice driving
maybe some special made titanium dirveshafts with 4 pins and special made Titanium hubs to accomodate them? i thikn this is the bet chance you can have to make those thing more durable. because i dont think just ttrying to thicken the pins would work since it would also weaken the hubs. dont know just an idea :P
Looks like it's time to make your own driveshaft with interhgrated pins that will just be the right size to fit inside the drive cups. Keep at it man. You keeping the speed runners alive and motivated.
Interesting project, I may have few ideas: -back end of your chassic is not streamlined and creates turbulence - decreasing difuser efficiency , stability and adding more aerodynamic drag? If you want to have the difuser really efficient, sealing the rear undertray part would also help. -Balancing the wheels might help with stability at high speed -I think the aerodynamics should be mainly about the stability rather than focused on the downforce. If you put Center of Pressure in front of Center of Gravity you get oversteering car in high speed but it will help with backflip. I think the point is to have a car aerodynamics with "medium" downforce and acting more like 60% rearwards but with low sensitivity on pitch angle change. So if your front bumps, it doesnt generate as big positive torque and therefore backflips. Introducing some degree of rake angle as you did helps. Also I would look at spring rates so the car doesnt "squat". Making aerodynamic platform as stable as possible with minimum pitch change under downforce -I think having no differential makes it more stable and less prone to malfunction -For the steering problem I would look for compliance in the suspension, steering rack (ball joints) and maybe it would need some rework? Maybe the servo is also not precise enough for the lever arm ratio?
Good luck with that that issue. That cars a beast. I can see you making your own custom shafts. Raz is it the front one that goes every time or the back as well?
Wow what a beast 💪 to pull that speed with that much wheelspin is insane 👌 I can't imagine the speed when you get those shafts sorted and it just hooks up 😳😎
Again a really cool and educational video. You always make me laugh with a joke too. Keep them comming we love your channel👍🏻👍🏻👍🏻 maybe a tip. (a bit weird trying too explain the speedrun champ but i also like to share) if your car pulls to the side, try after the first run too increase the toe-out by a bit. Increase after each run and see if it handles better sometimes i had to change the spring load on one side stiffer than the other to make it go straight. On a different road, i had to re-tune the car for that particular road. Sorry for my bad English. i hope if you didnt try jet, it can help a bit✌️
It's crazy to think that this puts down as much power as a go cart with 6-5hp. Briggs and Stratton's! And my old go cart with just dual Briggs was crazy fast.
Enjoying this a lot Raz. I'm thinking you might have to get those drive shafts custom made. You know how it is though, you improve one part of the chain it transfers the power/stress to somewhere else. I'd be interested to know how your diffs are set up.
What happens if you make a pass without the body, just the front wing from the unlimited, and gaffer tape on top of the rest of the car, it seems like the body makes all kinds of weird aero problems
Check the input cup on the front dif. Sometimes they are on slightly crooked which would cause excessive water and strain on the driveshafts. My kraton 6s had this problem. It chewed through driveshafts on 6s with the max 6 and 1650. And only the front did it. Good luck man.
Nice one buddy. You're really pushing the engineering science there. Those pins are under so much shear stress I can't really think what other material might help. Is there any such thing as a proper universal joint for those that will use 4 pins maybe? Either that or some cool rounded spine ball and socket arrangement a bit like full sized car CV joints? Anyway, top work fella!
So, from a mechanical perspective, I think eliminating slop between the pins and the drive cups is a step in the right direction, or going to a CV style shaft to remove slop. Any slop in that pin to cup is multiplying the already extreme load on the pins as it slams back and forth. doesn't sound like it could be much, but it is. Good shit as always.
Hi, I love your channel and what you are trying to do. Here are my thoughts on the problems that your are having. The body design appears to be trying to use ground effects to generate downforce. This works very well but any disturbance of air flow under the car can cause instability. Ground effects requires the side skirts of the body to be very close to the ground and the car chassis to have a little rake. At some point Cd (coefficient of drag) will be very important to getting the best top speed. Assuming the same Cd at double the speed you have 9 times the amount of wind resistance. So this requires a lot more power to accelerate against this opposing force. From the video it appears you are not power limited. As the speed increases so does the downforce (giving you more traction so more power can be used without wheel spin) but also the resistance from the air which puts a lot more strain on driveline components. If you had another body you could test with a lower Cd that would give you some great data. Have a look at the design of the Porsche 919 Evo/F1cars for inspiration. The 'coke bottle' shape is really efficient for Cd. The fin that goes from the back of the cockpit to the rear wing should give more ability to maintain a straight path of travel. This design feature is also included on modern F1 cars. I suspect this is why you find your rear wing design to perform well. The Redbull x2019 is another theoretical concept with some great ideas. Wheel alignment and steering rates are also critical to maintaining high speed stability. All the best with the top speed runs.
Power doesnt really seems to be the issue here. Lot of dragsters/Formula cars have bigger wheels at the back to have a better traction, and control over the vehicule since front wheels are only there to provide mobility. Should try that, would help you a lot on those phases where you lost traction. That wing on the back does not do much unless it has an angle of attack that keeps the frame down on the ground since lots of air is pushed under. You should consider small front wings also. Beautiful beast you got there, continue the work budy.
Hi there great video. I have an xo1 with dual xlx escs . I found more compliance and less heat when i made sure both escs wherein sink. Meaning that they beeped exactly the same time. I think one gets a millisecond delay causes all kinds a crap. So pleaae next run , try what i tell you. Would be so happy if it works out better. Regards Seelen
I dont get it I have a 29 horsepower X maxx that weights 30 plus pounds and I have no issues with driveshaft or dog bone pins. I know its a completely different platform. Is the driveshaft off balanced causing vibrations or missaligned slightly causing binding in drive cup?
You could try to set the Punch Level on the Esc´s lower, so that the Hit is not as Hard.. Also maby a dump idea... some Rubber on the Pins or maybe some flexible materiel in the diff cup, you dont have much Susspension level so maybe you can absorb some hard ompacts :) Just a dump idea xD
maybe make the wheel part of the remote a lot larger diameter for less sudden steering input *3d print or just add a large circle of foam or something*. That way you can make finer adjustments to steering without shredding the wheels so fast. It seems really sensitive.
5:02 - sounds absolutely amazing! Like an old V10 F1 car
RIGHT?! I thought about the same... ohh those days of Sundays v10 F1 morning sound!!!
Seriously? Its a sound effect and its v12
Man this engine sound is so good .
😂 😂 Was thinking the same, was waiting for ot to shift some gears 🤣🤣
First amazing vid brother keep em coming I wanna see 180mph soon
First he has to make the car controllable at 150mph
180... 🔥🔥🔥
maybe put in thicker pins and open up the cups? or more power!!
How’s your car coming haven’t seen it in a while
When it doesn’t work the only option in MORE POWER!!😂😂
when are the batteries for yours gonna arrive?
Hi
your red car has died
The rear wing is ineffective for a couple of reasons. What happens is the bodyshell is displacing the air at speed making the wing do absolutely nothing. If you raise the wing and also put some angle on it so it creates more downforce you'll find it'll run a lot lot better because when the car squats, its flat meaning its doing nothing.
Yeah, I agree. To go this kind of speed it would probably be worth putting this thing in a wind tunnel of some sort, even makeshift. Between the position and angle of the rear wing and the hard edge at the back of the body, I would be willing to guess that you are actually creating a low pressure zone behind the rear wheels and either not creating downforce and maybe even a little lift which is why the rear end is acting so loose. Good luck, that is a rad car!
MAN THO!! THE SOUND THAT BEAST MAKES WHEN IT'S AT SPEED. JEEZUSS!!
You can do it Raz. Jaw dropping. Thanks for sharing. John
Watched the first part yesterday and saw this on my recommended this morning. Would love to see more of this 😮🔥
I do t even know how to react...
149 mph.
That is awesome man.
Great work.
Gonna have to machine you're own shaft 👀 or talk to someone about it
Sounds like an opportunity to hit up one of the awesome machinist youtubers out there
ThisOldTony perhaps?
All part of the game! My dad and I built a 2000hp chevelle that weighs 4300lbs which is really unchartered territory for most parts stress wise. Every time something breaks you make that part stronger or find another solution until you’re left with a solid platform. Soon you’ll be left with a car that can handle even more power than you have in it now. Keep it up 👍🏼
Set dual rate/expo and also end points for less responsive steering. I would also try spool in front in case you have open diff. Keep posting, this is really interesting to see and professionally done 👌
That car is a work of art! Beautifully built. I hope you get it to work reliably and crack those speeds.
Have you tried a different body just to rule out down force issue. The rear axle seems to handle the power. Maybe something else caused front driveshaft issue. 🤷🏼♂️ good luck
AMAZING STUFF!!! You continue to put out the most interesting & most exciting RC videos I’ve ever seen.
Wow the science of speed expressed through RC.
Very cool
Wow! Yoga blocks. Love it! I just ordered a couple. I recently bought the “rotating thing”. It’s okay, but sometimes I have a couple of projects going on at once and also, the rotating thing isn’t all that stable. Great tip!
The joys of a need for speed!!! Keep up with the great video’s 👍🏁
This beast sounds like a jetpowerd airplane. Awesome!
Wow this is absolutely crazy. I love it!!! Only thing I suggest is getting a nice camera. I see you're relatively new to youtube, so having a nice camera image could help you gain subscribers. People like to see a resolution. The GoPro is good but just doesn't compare to other cameras. Anyways, keep up the great work. I'm excited to see what becomes of this RC car and channel :)
Sounds awesome! What a piece of kit. Can't believe it's that heavy. Great video
"We Eat The Dog" :D I don't think many heard that
What’s do you do with the old wheels? Those seem like they’d still be good for oval or slower speed if you retrued the foam.
The broken diff aside, have you run this car with the Toyota GT or Jaguar body, would be interesting to see if you had the same stability issues as with this carbon body
Wow man, once parts stay together your gonna blow that 149 away. Must be so frickin crazy trying to control an rc at those kind of speeds. Good job man cause it would most likely be in pieces if I was running it. Nice driving
Let’s get it champpppppp awsome run
Woah! That sounds amazing at speed!
Nice video boss
maybe some special made titanium dirveshafts with 4 pins and special made Titanium hubs to accomodate them? i thikn this is the bet chance you can have to make those thing more durable. because i dont think just ttrying to thicken the pins would work since it would also weaken the hubs.
dont know just an idea :P
Love the walkthrough on the updates!
That thing sounds amazing!!
just give a heart love for your dedication for rc hobby
I really look forward to these update videos; This is an awesome series!
Good work friend!
There has to be someone in the comments section capable of making this man some custom titanium axles.
Anyone???
nah use heat treated steel
Great speed pass Raz.👍👍💯💯
Once you get that setup right that car is gonna be flying!! 👍
Looks like it's time to make your own driveshaft with interhgrated pins that will just be the right size to fit inside the drive cups. Keep at it man. You keeping the speed runners alive and motivated.
You've created a monster! That thing is terrifying!!!
Holy smokes that thing is a absolute beast 🔥👍✌️
Dammit this channel is epic!!! Cheers from Ogden Utah!!
That is nuts!
Interesting project, I may have few ideas:
-back end of your chassic is not streamlined and creates turbulence - decreasing difuser efficiency , stability and adding more aerodynamic drag? If you want to have the difuser really efficient, sealing the rear undertray part would also help.
-Balancing the wheels might help with stability at high speed
-I think the aerodynamics should be mainly about the stability rather than focused on the downforce. If you put Center of Pressure in front of Center of Gravity you get oversteering car in high speed but it will help with backflip. I think the point is to have a car aerodynamics with "medium" downforce and acting more like 60% rearwards but with low sensitivity on pitch angle change. So if your front bumps, it doesnt generate as big positive torque and therefore backflips. Introducing some degree of rake angle as you did helps. Also I would look at spring rates so the car doesnt "squat". Making aerodynamic platform as stable as possible with minimum pitch change under downforce
-I think having no differential makes it more stable and less prone to malfunction
-For the steering problem I would look for compliance in the suspension, steering rack (ball joints) and maybe it would need some rework? Maybe the servo is also not precise enough for the lever arm ratio?
I love these videos keep them coming and don't give up.
Good luck with that that issue. That cars a beast. I can see you making your own custom shafts. Raz is it the front one that goes every time or the back as well?
Another awesome video... You'll probably design your own drive shafts.. looking forward to seeing u get around this issue. ;)
That thing sounds insane
crazy power in that car... twisted that shaft up hard
Wow what a beast 💪 to pull that speed with that much wheelspin is insane 👌 I can't imagine the speed when you get those shafts sorted and it just hooks up 😳😎
Great video can't wait for a good run
Love the sound of this car!!
this is sucha nice build man!! but sorry kev if this will not hit 200mph his wont for sure :-))
Dude that sounds like a lambo good video 👍
"We eat the dog and then we take the breakfast out"
your from Oklahoma too?
That car is insane. Love the sound.
That run..🏎💨🔥fu..its awesome
I’m loving this. Keep trying!
Again a really cool and educational video. You always make me laugh with a joke too. Keep them comming we love your channel👍🏻👍🏻👍🏻 maybe a tip. (a bit weird trying too explain the speedrun champ but i also like to share) if your car pulls to the side, try after the first run too increase the toe-out by a bit. Increase after each run and see if it handles better sometimes i had to change the spring load on one side stiffer than the other to make it go straight. On a different road, i had to re-tune the car for that particular road. Sorry for my bad English. i hope if you didnt try jet, it can help a bit✌️
Keep at it.
Super design bro !!
I just realized how cool this beast sounds!
One Luv! 👍🏾
It's crazy to think that this puts down as much power as a go cart with 6-5hp. Briggs and Stratton's! And my old go cart with just dual Briggs was crazy fast.
Enjoying this a lot Raz. I'm thinking you might have to get those drive shafts custom made. You know how it is though, you improve one part of the chain it transfers the power/stress to somewhere else.
I'd be interested to know how your diffs are set up.
What happens if you make a pass without the body, just the front wing from the unlimited, and gaffer tape on top of the rest of the car, it seems like the body makes all kinds of weird aero problems
Man that thing sounds wicked on the flybys
that sounds so good
One Tip: Lower Your Dual Rates!
And a bit of expo
Your project here is very interesting.
Check the input cup on the front dif. Sometimes they are on slightly crooked which would cause excessive water and strain on the driveshafts. My kraton 6s had this problem. It chewed through driveshafts on 6s with the max 6 and 1650. And only the front did it. Good luck man.
You guys are awesome.
Collaboration with Engineering Explained, or Smarter Everyday???? That would be gold.
Those first few attempts where you were standing on the roadside sketched me out xD that thing would straight up snap your ankles!
Great video. The bleeding edge of performance of performance, eh? Keep up the good work :)
Send you trying to go for top speed in a straight line perhaps locking front and rear differential ensuring that equal power to all 4 tires might help
Eat the dog, lol
Great video, can't wait to see your solution. Really looking forward to when she gets her top speed!
Yeah don’t eat the dog
Nice one buddy. You're really pushing the engineering science there. Those pins are under so much shear stress I can't really think what other material might help. Is there any such thing as a proper universal joint for those that will use 4 pins maybe? Either that or some cool rounded spine ball and socket arrangement a bit like full sized car CV joints? Anyway, top work fella!
Awesome! Bro
really looking forward to seeing the tutorial of building this amazing car!!!!!!!!! plz
Looks like you need to design a solid axle setup. Nice video.
Good stuff sir..
greetings from Puerto Rico. So fast bro
Omg I...I..this is insane!!!!!!😱😱😱😱
So, from a mechanical perspective, I think eliminating slop between the pins and the drive cups is a step in the right direction, or going to a CV style shaft to remove slop.
Any slop in that pin to cup is multiplying the already extreme load on the pins as it slams back and forth. doesn't sound like it could be much, but it is.
Good shit as always.
Where can I get this body from?
Hi, I love your channel and what you are trying to do. Here are my thoughts on the problems that your are having.
The body design appears to be trying to use ground effects to generate downforce. This works very well but any disturbance of air flow under the car can cause instability. Ground effects requires the side skirts of the body to be very close to the ground and the car chassis to have a little rake.
At some point Cd (coefficient of drag) will be very important to getting the best top speed. Assuming the same Cd at double the speed you have 9 times the amount of wind resistance. So this requires a lot more power to accelerate against this opposing force. From the video it appears you are not power limited. As the speed increases so does the downforce (giving you more traction so more power can be used without wheel spin) but also the resistance from the air which puts a lot more strain on driveline components.
If you had another body you could test with a lower Cd that would give you some great data. Have a look at the design of the Porsche 919 Evo/F1cars for inspiration. The 'coke bottle' shape is really efficient for Cd. The fin that goes from the back of the cockpit to the rear wing should give more ability to maintain a straight path of travel. This design feature is also included on modern F1 cars. I suspect this is why you find your rear wing design to perform well. The Redbull x2019 is another theoretical concept with some great ideas.
Wheel alignment and steering rates are also critical to maintaining high speed stability.
All the best with the top speed runs.
I wouldve crashed so bad! You are a damn good driver to keep it on the wheels
What a neat Rc. You should find a small camera and install it in the car.
Im sure u have connections for a custom drive shaft. Check out "johnnyq90" utube channel. He make some crazy rc parts. U guys could pair up.
This would be awesome !
@@gabrielhamel8 i agree;)
but johnnyq90 doest speak how would they comunicate
@@billysbikes8671 i didn't know that
@@mikeinvegas1 and you have watched his videos?
Nice. You'll get there I'm sure of it.
Power doesnt really seems to be the issue here. Lot of dragsters/Formula cars have bigger wheels at the back to have a better traction, and control over the vehicule since front wheels are only there to provide mobility. Should try that, would help you a lot on those phases where you lost traction. That wing on the back does not do much unless it has an angle of attack that keeps the frame down on the ground since lots of air is pushed under. You should consider small front wings also. Beautiful beast you got there, continue the work budy.
I don’t know anything about rc cars so this may be a stupid question but how do you control the car?
Amazing friend ✔
Wait, does that mean ~300 mph on 4x4? JK!. Well Raz it is time to get beefier machined cups and shafts! love your vids man!
here's me watching a 30hp rc car while crying because my full size daily driver car has 45hp!!!!
Wondering if you can take some steering trim out.
Why do you not have springs on the rear shocks? Just curious about what that does for the car. You got it after you break thru the 150 mark.
you should figure out how to connect servos to a gaming race wheel and pedals so you have finer tuning for turning and drifting, itd be a fun video
Iv no experience but i recon you should have locked diffs if you don’t already?
Hi there great video. I have an xo1 with dual xlx escs . I found more compliance and less heat when i made sure both escs wherein sink. Meaning that they beeped exactly the same time. I think one gets a millisecond delay causes all kinds a crap.
So pleaae next run , try what i tell you. Would be so happy if it works out better.
Regards Seelen
I dont get it I have a 29 horsepower X maxx that weights 30 plus pounds and I have no issues with driveshaft or dog bone pins. I know its a completely different platform. Is the driveshaft off balanced causing vibrations or missaligned slightly causing binding in drive cup?
You could try to set the Punch Level on the Esc´s lower, so that the Hit is not as Hard.. Also maby a dump idea... some Rubber on the Pins or maybe some flexible materiel in the diff cup, you dont have much Susspension level so maybe you can absorb some hard ompacts :) Just a dump idea xD
maybe make the wheel part of the remote a lot larger diameter for less sudden steering input *3d print or just add a large circle of foam or something*. That way you can make finer adjustments to steering without shredding the wheels so fast. It seems really sensitive.