My Final Fan Car Build - is it Faster?

[@OwenBuckingham11]

As an engineer who's also into RC, it's soooo refreshing to see someone actually using math and science to go faster and not just someone buying the biggest motor they can and driving until the car explodes

[@EngineeringAfterHours]

Thanks! It pains me to see the aero design issues with some of the so called speed bodies out there. Power is useless if you can't get enough traction to overcome drag. I'm hoping to touch on max acceleration curves and the relationship with downforce and drag soon.

[@EAGLINWRX]

Noooo not the end, mk2 is me fav. I was hoping to see you do a 4 fan fan car with 4 subsections under the car, that would alter fan speed based on acceleration. So when accelerating forward front two increase, when turning right, right two increase, so all 4 wheels have the same traction.

[@EngineeringAfterHours]

That's An awesome idea.

[@stutterpunk9573]

Yeah like active aero

[@glennhuman6936]

@@EngineeringAfterHours so do it!

[@Zooom-s5f]

​@@glennhuman6936 Is not possible, fans can't so fast speed up and slow down when is needed

[@WWMike12]

Longer wheelbase to reduce vacuum effects on squat/pitch sensitivity, also easier weight distribution? Would've been nice to see!

[@george91871]

I was thinking the exact same thing. That chassis is too short to get any real stability. Should've tried something Arrma...just saying. LOL Maybe a Typhon or Talion chassis probably would've worked a little better.

[@markmmm1737]

The traction issue is the very unflat concrete surface. All those small grooves must be massive to those tiny tyres. A nice asphalt road would be better. Now that you have destroyed the aero it now means you can explore a different view. Instead of making the car unnaturally heavier with the fans maybe try 4 individual suckers on the suspension arms so the wheels become heavy and not the entire car.

[@LaggerSVK]

separate aerodynamic body suspended to the chassics

[@fattmatt805]

Man I'm sad to see this project come to an end! (Although I'd have to assume a limitless is in the future). What body is this on your slash? Google has been of no use to me lol. Keep up the cool vids!

[@EngineeringAfterHours]

I hope to pass the 3D models on to a other youtuber working a pretty awesome limitless build. So while I'm through with it...maybe the fan car isn't dead. On the limitless front, I really want to redo all the aero to be real wings with much more downforce and less drag. Then I can sell the upgrade kits if people want to play with aero themselves.

[@fattmatt805]

@@EngineeringAfterHours that's awesome, a limitless with improved aero sounds great! What body are you using on the slash in this project?

[@EngineeringAfterHours]

It's a losi 8ight body. The 4.0 I believe

[@fattmatt805]

@@EngineeringAfterHours sorry, I was actually curious about the super car looking body from the slash? Thank you so much for the replies though!

[@EngineeringAfterHours]

@@fattmatt805 I'm not sure which one you mean. The white one is an arrma typhon if that's the one you're talking about. I've 3D printed several parts as well.

[@fyo_music]

Greetings from Russia. Your series of "downforce rc cars" are insane. Respect for so much science and math included. It was absolutely interesting to watch. Thanks a lot

[@EngineeringAfterHours]

Welcome and Thank you! My next video is planned to cover a lot of math on downforce and acceleration for dragsters that I think will kee0 adding to the fun with physics.

[@tsviper]

Nice ending to a series, looking forward to the dragcar. And thanks for not skipping the math.

[@EngineeringAfterHours]

Thanks! I really wish I could have gotten the 1s...but well get it on something else.

[@BossNachoFPV]

Good video. I love how the Mark Rober style is becoming popular. It’s a great formula.

[@rcbuilder111]

Man I really love how you explain everything is so amazing ❤️‍🔥🔥

[@knoopx]

man that dragster looks awesome. was going to ask about all the math but great you recommended some read!

[@gboulter]

So no prep of the dusty car park and on some takes accelerating over the painted line. It would also benefit a lot from a vertical fin on the tail you try flying a plane without one

[@rcpete7055]

Can you show us the build mor in depth please? Chassis, shocks, motor, esc, receiver, radio, body ect😀👍💯

[@slomojethro7403]

This is awesome. After recently seeing the modern adaptation of the fan car seen in the McMurtry Sperling car, my first thoughts were how to apply this to RC. With the performance you achieved with your designs, I would like to build a similar setup on a 4WD sedan based drag car that I have been developing. My biggest concern was the skirt design, apparently that is definitely the make or break point of the whole thing. Otherwise, glad to sub and keep up the great content!

[@rotauq]

I started with forged carbon too. Real cool stuff!

[@IndeterminateDesign]

I love how you showed all of the analysis you put into this to calculate the torque and traction. I need to do more of this with my streamliner project to really confirm how much power do I need versus how much can I put to the ground. Do you think the performance gained from the fans justifies the weight of the EDFs and batteries versus conventional wings? I hope this makes a comeback someday. I'd love to see it with an active suspension or the skirt tied to the suspension like the Chaparral to keep a constant ride height.

[@EngineeringAfterHours]

It's a tough call to say whether it's worth it or not. They're a pain to work with because of how much power they draw and constantly having to charge batteries. And of course filming with 4 different cameras adds to the complexity of the setup. They're also very dirty, and if you don't have the skirt just right, they create a ton of drag. But there's really no other way to get that much low speed acceleration on a road course. So if you need low speed downforce it'll win every time. I may do a respin of it eventually...but it'll be a big redesign and that's why I destroyed the undertray, body and fan housings. i may try more of a t.50 style with my ground effects. As far as real world racing...I think it's good They're banned. But it's certainly fun to something able to move around like that. The accelerator and steering is instant when it's working well.

[@ViCatRC]

This video is supercool, inspirational, very informative and detailed. A pity that sometimes theory and practice don't shake the hands so easily, but that's the more intriguing part of the game, isn't it?

[@brsrc759]

Always exciting! Love this channel

[@EngineeringAfterHours]

Thanks! Can't wait for some fresh builds that aren't as high maintenence

[@brsrc759]

@@EngineeringAfterHours haha me too! I'm about to upload a video of my latest deranged RC creation. It's going to be low maintenance because it is a sloppy thin sheet metal decorative Christmas truck I bought from Ross department store for .49 cents🤣. Mounting it to my SCX10.2. it's going to be cool driving something that will dent and rust

[@ezrarichardson279]

Hey! Great video! I have really enjoyed your RC car videos. I just wanted to tell you (for the futur) that you left to much headroom in the garage shot during the hole video. I know it doesn’t really matter and there might be practical reasons why it wasn’t possible in the moment but I just wanted to let you know. Thanks!

[@EngineeringAfterHours]

I'm not sure what you mean...are you referring just to the framing of the shot? I'm open to filming tips anytime so let me know!

[@ezrarichardson279]

@@EngineeringAfterHours Yeah, just the framing. The rest is gold! The content you make is really great and I just want to make it that 1% better. Usually you only want to leave the tiniest space above your head before cutting off the shot at the top. Hopefully that's helpful!

[@otakarlibal]

It would be super cool to do a tutorial on replicating this fan car. I would love to make one

[@keithcerce8445]

Holy crap !!! Did I just learn something ?? Lol Nice video. Interesting.

[@EngineeringAfterHours]

Thanks! Happy to hear

[@ctphilippi]

Instead of limiting motor torque, would it have helped to use a system that reduces it based on a gyro? Some (or all?) gyro systems can also reduce the signal towards the ESC, instead of only counter steering.

[@Liberty.Francis]

I am about to embark on a fan project for speed running. Did you find a skirt material that held up better than others? I was looking at shower door seals 🤨

[@calebmortensen7747]

Good work brother. I can respect that. -Mysef

[@mclr.cfabricationandperfor5255]

Balancing each wheel will help with a more stable ride. Increase traction less wheel hop.

[@HeliosX33]

The biggest thing this series has teached me is how deceptive Tesla and other companies marketing departments are.

[@Vinz3ntR]

Why not finishing off the car in Office Space printer demolition style?

[@Giuliana-w1f]

How does this channel have only 13.8k subs?

[@nolimitrc1]

They say 3 minds are better than 2 and wondering if you will release any measurements or cad if this so i can tweak at home and throw more data and money at this and introduce it as an ultimate no prep drag class

[@jairoluna9822]

This design has a big problem and that is that the suspension will not work so the pressure seal between the floor and the vacuum cleaner will be cut off and there will be no affective transfer to the wheels, which is what generates grip. I don't understand why it was made so big. It's not about making it so big, but about maintaining the seal at a specific point and not losing the pressure from the tires to the floor, which is what generates grip.

[@Futurerock1982]

try pressing from above. e.g. 45 degrees out the back with a lot of pressure. also gives contact pressure and some speed. or is my idea totaly wrong? i dont know

[@TheAntoine191]

It should generate some wild lateral Gs ? Did you tested it ?

[@DriftomaniacsRC]

Just grabbing my coffee to watch this one end to end

[@EngineeringAfterHours]

You gotta carry the project on for us now! This is my last go at it lol

[@Boomtendo4tw]

I think some ppl didn't watch till the end. The dragster could work with fans too

[@0Ninja0Dude0]

were the stock Traxxas electronics being used? Traxxas controllers tsm could really throw you for a loop if it's not turned off and make you destabilize at high speeds. I feel like there could've been a better platform for this design as well. There's also so much to account for on an rc going 0- 60 everything has to be trimmed and tuned perfect you have to be an rc wiz to get those speeds out of any car. So ill give major kudos for attempting to do so with a less than optimal setup

[@drangus3468]

Surely there's a flatter place to test this? All those corrugations must be making a big difference to the regularity of the vacuum the car is pulling.

[@EngineeringAfterHours]

I think you're right. Where I live the majority of New roads are concrete and all have expansion joints. I'm going to try and get clearance to test at a local drag strip for other speed cars.

[@drangus3468]

@@EngineeringAfterHours The question is: if you find a nice flat test strip, will you be able to resist trying another incarnation of fan car?

[@EngineeringAfterHours]

@@drangus3468 I'd probably go rocket car first!

[@jams_finest]

you need to get a first pass module for straight control launches

[@EngineeringAfterHours]

That's the first I've heard of this...can you share a link to it?

[@vito7056]

That was good math. If it was taught like this, maybe I wouldn't have failed college algebra repeatedly.

[@EngineeringAfterHours]

Thanks! I have considered trying to make a physics course that uses racing as the examples but an entire course is a lot of work.

[@scottmawe2448]

Awesome video thank you.

[@keiz2life]

Bad ass🤟🏽Im following this guy

[@CircsC]

Have you considered an electronic wheelie bar as a project? It seems possible and would be super cool. It'd be a much less finicky kind of project too I think.

[@EngineeringAfterHours]

Haha yes I have. I want a wheelie bar that connects to TSM and keeps me straight when wheels are up

[@CircsC]

@@EngineeringAfterHours I have to admit that sounds really cool. I want it to optimize acceleration with 8S. The power is too much.

[@AppleLaptop]

It says "RC Ran Car" in the description

[@jasont9063]

Do you think a Gyro stabilizer my help?

[@81brassglass79]

This has been an exciting ride. I wish to become an engineer. Going to NIU for biomedical engineering. Pray for me. 😭

[@EngineeringAfterHours]

Good luck! Biomed is definitely an incredibly hard major...I mean all engineering majors are but biomed is very niche as well as being engineering.

[@dan5her]

What kind of camera were you using for the onboard footage, looked like it was some kind of gyro cam?

[@EngineeringAfterHours]

Insta360 go 2

[@groyperp9978]

Stick to KZbin man. You are going to get big. Glad I got to be here at 14k!

[@rajdeepsumman1924]

Is there a cheap but reliable 3D print you suggest? I really want one so I can do cool projects like this but most are either expensive or come with problems??? Plz

[@EngineeringAfterHours]

This is a tough one. The creality ender was the big name for a low cost printer when I purchased mine...but I know those come with some maintenence. I paid a premium for the dremel 3D45 just so I didn't have to deal with any issues or print failures.

[@Alan_Hans__]

210A :O . Got any links to motor, battery and controller? Out of curiosity do you know if the wheels change radius as they spin faster. As you were accelerating you were potentially losing downforce if the wheels were increasing in radius. This could explain the loss of control and traction the faster you went. I called BS on a video I was watching a few days where someone was claiming 60hp from 4 motors. From memory I think I calculated that they only needed a measly 6000A for the claimed horsepower.

[@rotauq]

6000A for 60hp (45000W) would be true on 2S power. On 8S it would only require 1340A, devided over 4 esc's that's 334A each. That's doable, assuming the batteries are dedicated per esc

[@EngineeringAfterHours]

The motor is a castle 1515 with monster mamba x esc. The battery is the spektrum 5s 100C 3200mah. I've watched raz's videos a few times and he's technically calculating his electrical power right. But the mechanical power is going to be way less than that. He's going to lose a lot through motor and wsc efficiency, the through the driveline. Either way I do want to see what his 4 motor car can do. If he fixes the aero it should be a top speed contender.

[@chrisrobey77]

Have you considered using something like raz shifrin’s perfect pass for throttle control?

[@EngineeringAfterHours]

I thought about it but actually just bought a transmitter that has the function built in. This way I don't have to deal with a potentiometer and no digital readout. I can also program an exponential curve. Perfect pass is great if you can't get the transmitters that have the function built in.

[@chrisrobey77]

@@EngineeringAfterHours which transmitter did you go with?

[@EngineeringAfterHours]

Noble nb4. Wanted the high end futaba but its just too much.

[@swecreations]

Maybe try doing it with more powerful fans and skip the skirt so that the car becomes less of a headache and prone to loss of traction?

[@skycorrigan6511]

What model rc is this made from?

[@steverolfeca]

If you plan on conducting experiments with wheeled vehicles again future, learn about wheel alignment! That level of rear toe-in is for dirt tracks. It would have been considerably more stable AND faster with more neutral wheel alignment.

[@EngineeringAfterHours]

I understand toe and worked with several different front toe angles through this video. I think you're just not aware of what you're seeing and making assumptions. You're also incorrect about toe in general. Positive toe stabilizes a vehicle at the expense of turning ability, negative front toe improves cornering ability at the expense of straight line stability. 1 - rear toe on these cars is a fixed 2.5 degrees. I'm not custom designing A arms first off. 2 - the rear toe angle on this car straightens under acceleration because the structure is relatively flexible. Parked toe angle doesn't mean much in terms of handling performance when it's so different than the realized toe under acceleration. 3 - the static toe angle on this car is barely greater than those used in open wheels series. Those cases use positive toe in the rear and negative up front. The biggest difference in my case was actually running slightly positive front toe to improve straight line stability during 0-60 runs.

[@tkostang]

Should have gone with a larger 1/7 platform…. Could have beat that 1 sec 0-60 without fans

[@manvindarsingh]

Revive this project man, try 4 fans with longer wheelbase and 4 motors

[@Project-Air]

Hey man, as I'm working on a fan car of my own, it would be great to talk about your experiences on my upcoming video. If you want to jump on a call, let me know! - James

[@EngineeringAfterHours]

Yeah I'm definitely down to chat. I can share files as well if you want to save a little trouble. Realistically the harder part is seal integrity across anything but a perfect surface.

[@TheTonester2312]

I love the part where the project gets destroyed 🙌🏼 I'd do the same.

[@engineerpauly7480]

This is the first time I'm seeing this... Did you try gyro stabilisation?

[@EngineeringAfterHours]

I'm running a traxxas TSM system on this car.

[@engineerpauly7480]

@@EngineeringAfterHours ok, i don't understand why its not working then. It seems like like it was correcting the steering in the wrong direction and making it spin uncontrollably.

[@EngineeringAfterHours]

@@engineerpauly7480 it can't respond fast enough.

[@kalebhenry4048]

what was this car befor every thing done to it?

[@EngineeringAfterHours]

Slash 4x4 vxl rolling chassis

[@tuomassyrjaniemi]

Wow! Dont give up yet! Im waiting for mk4 fan car. I think aerodynamics has quite big role in stability. In next car there should maybe be some vertical stabilizers to keep it straight.

[@EngineeringAfterHours]

Vertical stabilizers will come on a car at some point. Sharkfins or huge endplates. As for the fan car...im hoping to let someone else shoot for MK4

[@oneshotstudio]

HYPED TO GET THIS NOTIFICATION

[@eformance]

This video could be titled: "Lessons in unintended torque vectoring" 😁

[@EngineeringAfterHours]

Haha...definitely. Or "why locking differentials matter"

[@nolimitrc1]

Dude im back again and still baffles me how ur channel isnt at a million subs!! This is donut media for rc cars!

[@apexdisease6030]

Is it the 1515 motor that you have?

[@EngineeringAfterHours]

Yes

[@alexberman8900]

Great video as always

[@EngineeringAfterHours]

Thank you

[@wags9777]

Need racepac tuning for rc cars

[@J.C...]

If you can't give it any more throttle without losing traction, you need stickier tires, better suspension, and/or power management. There's a point where you can't put any more power to the ground without modifying what you currently have. Doesn't matter what gear lube you try. Sort of like in this vid. Without wider, stickier tires and a redesign of the suspension system to actually work correctly, you weren't going to get any further with stopping wheelspin at speed.

[@EngineeringAfterHours]

I think locked differentials would have solved the problem. I'm not sure there are tires much stickier than the GRPs I was using...but when they pick up dirt they lose that stick so track prep is king. I wish i had my nobel NB4 to change the throttle maps, that may have gotten me there without the locked diffs.

[@master-gbig1140]

Man, you sure have a nice back yard.

[@EngineeringAfterHours]

Thanks! It's been a lot of work and lucky timing.

[@master-gbig1140]

@@EngineeringAfterHours I think you may have exceptional skills in masonry work for what I saw, and even though I didn't care for the way the fence post were showing, it looks vary neatly done. "Great job on the back yard." "Thumbs up."

[@marcsurpris3034]

i think if you had done these tests on a basketball gym floor the results would be more insane.

[@StephenKoplin]

Why not just increase the tire size (even just a bit) instead of limiting torque?

[@EngineeringAfterHours]

I considered it, but the car is geared for a specific speed and it was hard to maintain that balance. I also would have to do both, torque limit and change the tire. I still should have done it regardless because I think the GRPs were cooling or getting dirty mid run and losing traction. It's really hard to tell.

[@roby8382]

At 3:22 did he just proved that you can do a whelee and a burnout at the same time and the 1'st fast and furious was correct? 😂😂

[@EngineeringAfterHours]

Haha great catch

[@JoshHefnerX]

A longer wheelbase, stiffer chassis would have improved the launches.

[@EngineeringAfterHours]

Longer wheelbase is a good idea and something that will help me in multiple areas.

[@bowieinc]

This is Proof the YT algorithm is garbage 🗑! Looks like you’ve been making videos for 3 years and I’m just now getting your videos in my recommended? Only good thing is I get to binge watch without having to wait! Great Channel, I’m excited I found it:)

[@EngineeringAfterHours]

That's what I like to hear! Thanks for watching.

[@ThatRCGuy1]

This is mark rober rc version

[@EngineeringAfterHours]

If only I could get that many views lol

[@warhammer5789]

Longer chassis to hand the HP ie: why Corvette went mid-engine.

[@EngineeringAfterHours]

The corvette went mid engine to lower rotational inertia and improve weight distribution. If chassis length was the concern they would have just increased wheelbase.

[@Boomtendo4tw]

Alright cool, dragster will get you some great times

[@florinp4115]

it's not ugly, it's cool

[@friktionrc]

I’m a ‘function’ over ‘form’ guy…give me something that looks horrible but goes faster than anything else compared to something that looks great but goes slower than asthmatic amoeba in a school zone. Shame you destroyed it….You have something like 14.2k followers, and I’m sure many of them, like me, are from across the globe….so you could have offered to auction it off with proceeds to going a charity of your choice…I’m sure many would have bought a ticket or 5 hahahaha….Just makes me a tad sad seeing you destroy something that I’ve watched you intently build and dreamed of building myself (but lack the talent lol)

[@EngineeringAfterHours]

I only destroyed the parts that would all have to be redesigned or were damaged. The majority of the car is very much still alive and being built into something new :)

[@friktionrc]

@@EngineeringAfterHours I did see the shell getting a pasting but was worried the other bits of destruction were too graphic to be shared lol….but PHEW!!!! Great to know….I await the new project with baited breath….just out of curiosity, does it involve an aluminium shell, a flux capacitor, something ‘burrowed’ from the Palestinians and an 88mph speed target by any chance? 🤔🙂

[@stutterpunk9573]

I just tried weed for the first time this should be good to watch when it kicks in

[@benakhovan184]

love the content, i think better editing will make the vidoes better tho...

[@EngineeringAfterHours]

Anything specific you can think of editing wise that will improve it?

[@AutoBodyEverything]

Traxxas is light so it could be a good candidate for the project vacuum car but traxxas vehicles don’t handle as great and hold power down like other better brands but weight is debatable.

[@EngineeringAfterHours]

Weight played a huge role in it. If arrmas weren't so damn heavy this would have been a limitless. The traxxas was far from stock too. X01 diffs, MIP Xduty shafts, steel gears...etc.

[@RocketCarMan]

sorry man.. thanks for sharing

[@PSwayBeats]

You should get rid of most of the skirt

[@thomasmancuso8805]

Why is your talking head camera set to 1 million ISO

[@EngineeringAfterHours]

Its a Garbage front facing cell phone camera.

[@imemployed1524]

His last build and I jus found out these existed 😵

[@EngineeringAfterHours]

Much greater things to come. I'm just wrapping up the fan car series for now :)

[@humboldtoregonian9400]

I'm like number 11 yay!

[@PSwayBeats]

Make a tiny alternator HA! probably not possible

[@markrice23]

You've just rage quit you're goal man 🤣 You can do it 👍

[@EngineeringAfterHours]

Lol nah...changing platforms to a proper drag car. I've got too many new builds I want to try out to spend much more time on it

[@markrice23]

@@EngineeringAfterHours fair play. Good content though 😉

[@lonniehand1386]

Well I haven't been to this chanel before because it said it was the final video is it faster and boy I was disappointed i thought it was like the rest of the builds on utube a vid showing the car doing a flat out run and wrecking it in some dramatic way but all I seen was a talk all the way through and hitting it with a bat

[@MaxS-v]

Friction coefficient cant be more than 1 Averege slic can produce 0.6-0.85

[@EngineeringAfterHours]

Yes it can and is frequently above 1 on racing slicks. When they get warm they become adhesive.

[@æ170-g7f]

add a spoiler it will help

[@Eduardo_Espinoza]

Can u. Get more into the maths, thank you ✌🏻

[@EngineeringAfterHours]

I will try to sneak more math in there! Some people get a little mad if I get too technical so I'll have to be clever about it

[@Rc_Alex_76]

I'm a fan

[@EngineeringAfterHours]

Pun intended?! :)

[@ChristAcolyte]

7:57 "Imperial units" I'm going to be sick 🤢🤮

[@EngineeringAfterHours]

I tried to use both units through to make sure everyone had something to complain about :)

[@roonimaka9365]

Words most used unit.

[@warhammer5789]

Your chassis is too short, all cars rear wheel drive, mid engine, or fwd awd, have speed tolerances due to chassis length, if the horsepower is too high, the front wheels will begin to toe in causing the car to spin out, it doesn't matter whether you are running limited slip or posi, your chassis needs to be longer in order to handle the HP

[@jonathansaucedo3199]

You could have gave it too me…

[@dutch1800]

Office Space anyone?

[@felipenomade]

Why destroying it???? Could give away to me

[@hardshake7324]

you should have done a sell for a good reason thing

[@EngineeringAfterHours]

Anything useful is kept. I only destroyed the useless or broken components. Even the fan ESCs will likely be reused for a desktop wind tunnel

[@Legend-lc9bv]

Bro can I have this rc car?

[@theirishaxe9405]

Lock the diffs

[@daankoopmans6621]

Finaly