They say it's going to break! Can composite engineering save my supercar?

[@nickp3173]

You're the engineer building a supercar from scratch. You don't need to prove anything to the trolls in the comment section. You're the smartest guy in the room, clearly. Can't wait for another episode! Getting so close!!! God bless!

[@BuilderCreator]

The trolls were just an excuse, the video was for you.

[@RENO_K]

​@@BuilderCreator😂 i knew it, ppl watch "hate comment reaction video"s a lot more and a lot more supportively, smart move, ig that's why ur an engineer

[@nickp3173]

@@LTV_inc And what are your credentials sir?

[@shortchanged.]

Can't wait to see him drive it 😊

[@amazin7006]

@@LTV_inc Air pockets do not hurt structural integrity much at all, if you build in a safety factor it's more than strong enough. The difference in load bearing strength between a vacuumed composite and one that isn't is just a few percentage.

[@Transformers_nerd_stop_motions]

You're such an honest individual, I love how transparent you are in your builds

[@BuilderCreator]

Yes, I am honest! Where do you live? When do you go on vacation? Where do you keep your spare key?

[@mikeleonard8031]

And what is the pin code to your vault?😂

[@C-A-L-M]

​@@BuilderCreatorim doing a project of my own could i contact you for some discussion?

[@frederickthorne2496]

I love the stress test demos. I didn't doubt your engineering skills, but I did enjoy seeing just how the different configurations of geometric composites you used on the Arete supercar held up to the stress tests. This car is already a masterpiece. So excited to see it develop further.

[@BuilderCreator]

The stress test was a bit "archaic," but the FAA still uses sand bag testing for aircraft wing loading!

[@fitzymagee7469]

fascinating but you are wasting your time indulging the doubters. Just do your thing & pay them no mind.

[@Gamertrix117]

Was thinking the same. Poor guy wasting his time and money on materials, because of a few keyboard warriors.

[@MisFakapek]

Exactly..

[@dickieknutz2933]

Hes making bank

[@Marty59143]

Keep up the great work.

[@BuilderCreator]

The video was for the "community," the doubters are just my scapegoat.

[@chrispickard3337]

Love your basic tutorial for those who don't comprehend and love watching your progress! -aircraft engineer specializing in composites.

[@BuilderCreator]

To an aircraft engineer, everything flies; some just not very high! ;)

[@simonwatson5299]

I was going to say, just look at most single engined and twin engined aircraft. These are all made of fiberglass and composite material, and that the wings of these machines undergo much more stress than a composite car would ever go etc... but you beat me to it. lol.

[@dinguth4695]

@@BuilderCreator with enough power you can make anything fly!

[@aarondcmedia9585]

8:45 - The electroboom of composite stress testing!! Thank you for a fantastic tutorial. Just the right amount of tonal expression in the opening too, well done. I can imagine your core got a bit of a workout moving that weight around for a couple of hours. The Jarvie museum of self education sounds like it would be well worth a visit.

[@BuilderCreator]

I can handle moving the cinder blocks, but I should have worn gloves, as those blocks are hell on my manicure! ;)

[@gilesspencer4278]

Always such well thought out and educational videos. I've been following this build since day one and can't wait to see the final product!

[@bradmaas6875]

I've watched you work this thing from the beginning, I've learned a lot, and have no doubt this thing will hold together just fine. Faith in your abilities, I call shotgun when you're ready to test.

[@BuilderCreator]

If you pass the minimum butt width of 14 inches? ;)

[@bradmaas6875]

@@BuilderCreator Minimum or maximum? It'll be close.

[@anomamos9095]

Many aircraft have catastrophically failed in flight not because they weren’t made strong enough but because they didn’t account for fatigue caused by constant varying stresses, especially those that never exceed the deformation point. Depending on the materials and the design such repetitive stresses may never cause an issue even beyond the normal lifespan of the aircraft (or super car) or they may fail quite rapidly. A rule of thumb in design is to ensure that what you don’t want to break should have all forces acting on it accounted for and have visible markers that indicate fatigue before it becomes critical. Also if something is expected to eventually fail it needs to be replaceable. Generally you want to have something that can fail safely connecting things that you don’t want to fail.

[@BuilderCreator]

I have 4 children and 8 grandchildren- when I finally fail, I have my replacements lined up!

[@dtc2044]

Model A was built on a wood chassis, here you have the load being passed through the roof into the firewall from the bulkhead. Power plant attached to the bulkhead and it being the bulkiest part of the car, hence the name. A camaro only has 4 bolts holding the front subframe with 2 point, you have 4 points holding it. Though I do wish you had a crash bar hidden in the rocker for that extra protection, how each layer was applied makes this stronger then most airplanes 🤣 you'll be fine and just want to see it the "today is the day is finished" with a full compilation so I can show others its not impossible

[@BuilderCreator]

When you hear me say "Today is the day!" and it means it is finished. Will that be a happy or a sad day? Both?

[@dtc2044]

@@BuilderCreator I asked the same question about my 59 fiat 1100. I learned its not the project, but the journey towards a goal. Then we get to see what it can do! see it win all the awards and how happy it will make you 😁

[@mcbridemotorsports5788]

I've learned more in the 20min of this video than 2 hours of reading my book on composites! Great Video! Keep up the content

[@BuilderCreator]

Maybe you are like me and 2 hours of a composites engineering book is 2 minutes of reading and 118 minutes of slogging through the math. ;)

[@54mgtf22]

I have complete faith in your engineering, Jay. Keep up the great work. 👍

[@BuilderCreator]

Thanks, I have complete faith in your regular and decorous comments.

[@Moonisnear1]

Today is the Day! Love it!

[@Jmdeclue]

Keepin’ it real! 😂 So many people would do well by asking questions or just saying they don’t understand rather than letting everyone know they are just wrong. Where’s the humility?

[@BuilderCreator]

Only the humble who think they have it don't!

[@jd.1150]

Been with you from the beginning. By far the best build channel on KZbin.

[@BuilderCreator]

Appreciate the early followers. You're the best!

[@d7metal-mecanica137]

Thank you for sharing these tests, they are timeless information and necessary at any time. Thanks

[@wesgyver]

Great video again! I have no doubt that the car will hold up! I never had a doubt, but it was fun to see your testing to prove it. Looking forward to seeing the project continue. Thanks for sharing your project with us all!

[@judahrex]

Excellent video. All the way there professional. Sensational. Well put together and informative. Educational. I am amazed by your technical know how and hands on approach to fabrication. A true master at work. Absolutely well done. I wish there was more like this on the tube. One in a million. No one else out there is even remotely close to your level of building knowledge and automotive engineering on this platform. Today was indeed the day.

[@BuilderCreator]

Today was indeed the day with an ego building comment like that! I'll try to live up to your high ideal of my work.

[@patrickfeuillet6878]

A convincing proof on how strong composite materials are. Thank you

[@UnityFAN]

Very educational... Learned a lot! Thank You!

[@prowrench7989]

On your way to 100K. Really enjoying your channel.

[@BuilderCreator]

Super close to 100K. KZbin shows that you are not one of the subscribers. Are you the one keeping me from fame and fortune?

[@prowrench7989]

@@BuilderCreator My bad, I'm subscribed under another account, fixed it with a sub under this one too! Keep up the great content! Best Regards

[@lamborghiniregistry]

Great video. I wondered about this myself Thanks for the explanation and demonstrations

[@TheRealKlinky]

I love material science - it was my favorite module during my Mechanical Engineering degree. A lecturer once told me "A trick us engineers use to make things more flexible whilst maintaining strength is to use thinner individual pieces & increase their number, think along the lines of a multi strand steel cable vs a solid steel bar"...I've used that principle a few times in my professional career & I remember him saying it like it was yesterday.

[@craigschroder]

Go for it ! I'm sure its not structurally perfect but you have put a good amount of logical design thinking for it to be successful. Projects like these never end, even when its all done and driving, one finds annoying issues

[@adamkubacki1958]

Thanks for sharing your knowledge. Great experiment. I predicted the shapes but didn't know about the foam core. Makes sense.

[@justtowatch111]

Sir, even if your incredible piece of art were to break in half (I'm not a doubter and frankly believe your car will ROCK) you will have done what you set out to do and will have CREATED something that didn't ever exist before! Rock on man, rock on!

[@spongesurf12]

Good info Jay. I've been on racing sailboats in the 30-50ft range where the hulls are glass/core or now carbon/core and they can be anywhere from 1/2" to an inch or two think depending on which part of the boat. The loads they take from a mast longer than boat length held up by tensioned rigging and then sails with the force of the wind is enormous! And people sail around the planet in these. I think you know what you're up to on this car and don't let the haters determine your need to respond. Can't wait to see when she can finally get driven around!

[@BuilderCreator]

Yes, moment bending stresses exponentially increase with span; I can see a 50 foot hull being very thick, with a built-up keel and bulkheads to spread out loads to boot. My pitiful 5 foot spans pale. If you are a boat person, I will let you in on a little secret- There is a boat project going on here at BuilderCreator.

[@alanshearing7515]

Thanks for showing us this , found it very interesting. I have no fear and would love to have a ride in your car when it’s ready !.

[@BuilderCreator]

Glad you enjoyed it. With all the offers for ride alongs, I should have built a bus. ;)

[@alanshearing7515]

@@BuilderCreator 😂👍

[@lotusesprit38]

Great job, congratulations, the design looks great. Keep the good work!

[@-MacCat-]

Another entertaining and educational video from BuilderCreator. Thankyou

[@martl20]

great demonstration! You will definitely succeed and there are always people who will doubt your skill level. Watching your video's I know breaking of the car will be the last thing to worry about.

[@davecourtois5142]

Nice work and nice demonstration. Don't take to much attention to negative comment, they are all the place anyway, those who made it don't make mistake simply because they do nothing else than commenting... Thank's for sharing your project it's always nice to see creativity at work!

[@paulelverstone8677]

Just superb. This channel is such an education, I love to see whatever it is that your'e about to do next...

[@BuilderCreator]

More education for me than the viewer. ;)

[@ruckus48]

Great video. Do your thing, man!😎

[@BuilderCreator]

Thanks, doing the "thing" whether right or wrong. ;)

[@ngrader]

I was always wondering if this had any FEA or other modeling going on behind the scenes... I guess this answers that question, LOL. Still, car looks cool and is a cool project. After all it is a prototype.

[@BuilderCreator]

FEA in our case is Fake Engineer Assessed. ;)

[@basementsupercarbuild2948]

Sometimes the couch critics make me laugh. Most people that have concerns will ask question first so they can make an educated comment. Some comments are very helpful and some people see things that I missed or see things in a different light, which is helpful. But occasionally you will get comments like, that is just a bug waste of money and someone is going to get killed in that death trap. That's when I laugh and think, do you think I am planning on taking the car to the autobahn and doing top speed runs all day. Anyway, I enjoyed the video and education, thanks for all that you do.

[@BuilderCreator]

Yep, I have that same thought. I will probably not die at 5 mph on my first run. By the time I get it up to 100mph I will likely trust it just fine. I doubt those people expressing their concern have never sat upon a motorcycle. Ha!

[@ideas_for_life_1]

Thank you for making this channel and content. Amazing.

[@kevinkerlin5603]

Keep it coming nice development.

[@BuilderCreator]

Thanks, will do!

[@k.bellingham8335]

In case no one else said it, let the haters hate. Pretty sure you'll be driving and having fun in a car that you built from scratch using proven science and engineering. Thanks for the effort to show the test samples - educational.

[@BuilderCreator]

You're welcome! The video was for you, not the haters. They are just my excuse for content . . . Although with two car projects going, I do not lack for content. ha!

[@rjung_ch]

Hi Jay, there never was any doubt in my mind that this would be strong enough. Shapes and the layers are the difference, that's why it works. Cheers 👍💪✌️

[@bartroberts4876]

You've got this. Always naysayers in the bunch. The Mossler Consulier GTP was so successful it was banned by numerous racing organizations. It shares a similar composite monocoque like your design that most said wouldn't work. I look forward to you driving that baby!

[@carmel721]

I enjoyed your video and I really appreciate all the effort that you’ve put into this vehicle. If I were to provide a peer review, I would say the following: 1. Your sketches didn’t show any triangulation between the beams that you’re running in the vehicle. Nodes and trusses greatly improve the stiffness of any structure, that’s why space frames and bridges and even monocoque chassis’s are built this way. 2. Instead of foamcore, I would use nomex honeycomb 3. Because the shape of a vehicle is an extremely complex structure, you can create a finite element model of your vehicle and test it in any way you’d like using finite element simulation. Chassis design is an iterative process. 4. Generally speaking, the tensile strength of any material in any shape is available for free online, there’s no need to do any testing. The shapes that are generally used usually form closed structures, and the proven methods are usually body panels over DOM tubing, but you can certainly build a space frame from carbon fiber as well or glass fiber. 5. Because your frame uses complex shapes and directional composites, the analysis becomes much more complicated but it’s hard to know for sure even after all the testing you performed. I would highly recommend creating a finite element model of your chassis and having someone with LS-DYNA or Ansys run the analysis for you. Good luck!

[@mchristr]

Hey, found you again. I lost you a while back when you started the offroad project. It's great to see the supercar alive and well. Press on.

[@BuilderCreator]

I won't lose you again when next week's video is on the Leviathan project, will I?

[@mchristr]

@@BuilderCreator Your knowledge of composites is stellar so count me a subscriber. I’ve got a lot of catching up to do on previous content.

[@clydecox2108]

Since video one, I’ve had complete confidence.

[@BuilderCreator]

Thanks, but I'm still working on my confidence from video one . . .Confidence in making a decent video, that is. Ha!

[@clydecox2108]

You’re doing fine.

[@monsieur-lecorbeau2246]

I missed you ❤ uncle

[@detrmichi]

In 1985 Warren Mosler, built the Mosler Consulier GTP. 1988 It was the first car to pull over 1g grip and well exceeded all speed and safety standards, the chassis was made from a fiberglass-and-foam monocoque, with an integrated carbon-Kevlar body. It weighed only 2,200 lb. The Consulier GTP was banned from IMSA racing in 1991 after being given a 300-pound weight penalty. The car's excellent power-to-weight ratio, in 1985, was originally powered by a 2.2 liter, turbocharged Chrysler 2.2 I4 Turbo II and success in IMSA racing for six years made it unbeatable. The Mosler Consulier GTP Is America's Forgotten Supercar. Jay your doing what one of the greatest builders did. Road and track and other publication talk how ingenious he's design was! Your car probably will out preform most higher value cars.

[@rivenmotors7981]

Great video Jay, love demonstrations like this. You always make me want to drop playing with steel and grab some composites.

[@BuilderCreator]

One day I will be setting aside the composites and getting out an English wheel!

[@sarchlalaith8836]

When you talk about the foam core samples being opposite do you just mean foam up/foam down... Or are they different in construction? I didn't quite get it

[@BuilderCreator]

The foam has no up or down side. The difference was two layers of glass on one side and only one layer on the opposite side. The sample was flipped in the test. 2 layers or one layer in compression. 2 layers in compression won!

[@sarchlalaith8836]

@@BuilderCreator ah oki cheers

[@danromeo6571]

Ive watched you from the very beginning. I think this is no seat of the pants hot rod project and all of its well thought-out beforehand. I'd feel nothing but safe to be the test driver. 🙂

[@BuilderCreator]

Even a test pilot only gets to "taxi" on the first run. We would all feel safe. Ha!

[@ChutneyInc.]

Thank You

[@MakeMine3D]

Badass. Straight brutal and great examples.

[@rbyikes]

coolest geek content ever, don't stop doing what you do

[@BuilderCreator]

Geek content? Thanks for the compliment.

[@rbyikes]

@@BuilderCreator Yes Geek. Narrow audience type stuff with tons of information for those interested in the topic. As much as I enjoy the content, there is no way I could get my girlfriend to sit and watch it.

[@BuilderCreator]

@@rbyikes True, My wife is no geek either. No KZbin at all.

[@JanEringa8k]

*Dumb question time:* If the direction of the fibres are offset by 45 degrees does that help or hinder. I was thinking of ply-wood that alternates the direction of the wood-grain to improve strength, but given the the fibre cloth already has fibres running at 90 degrees to each other, then a layer at 45 would seem to help... Or have I missed something?

[@BuilderCreator]

In the Tub, I need very little strength running from side to side. Most loads will be from front to back (connecting the subframes). Turning the fibers to 45 deg to that axis aids in preventing twisting.

[@vincentsarno2178]

Honestly can't wait to see this car in motion!

[@jetink600]

After seeing the crazy strength of the demos and also seeing that even you underestimated their strength, I'd bet that the car is closer to over built than under built. Never doubted you for a moment!

[@BuilderCreator]

Did I underestimate the strength of the material or overestimate the weight of water. ;)

[@beavercleaver6294]

You are a very patient individual. Being a structural engineer I would have ignored everyone on the WWW. Most don't know which hand is their left.

[@BuilderCreator]

I really am not bothered much by the doubters and haters, they are what they are. However, those that complain that I am taking too long (to provide their free entertainment?) can really torque me off.

[@ronkluwe4875]

Watching your build from the first video, I have never doubted you were doing your homework and building a car that has more than enough strength to handle the projected loads. My one "concern" was that you were building in too much strength and could actually lighten the car from where it has ended up, yet still have more than enough safety factor. But I also understand you are not performing FEA on the structure, nor working with a laminate engineer, and therefore are properly erring on the side of a little bit overbuilt is far better than a little bit underbuilt. Your work is first class and something all of us should ascribe to achieve. What is going to be interesting to see in the years to come is the application of AI to laminate structures and how layups will be transformed to carry the designed loads. I have seen some renderings of AI generated composite structures and they look very organic and almost artistic in their form.

[@BuilderCreator]

Czinger has used a lot of Generative (AI) design in their car. Interesting, is that you start with one set of design parameters and as the car losses weight you have to start over with new parameters.

[@dontask8979]

A fiberglass boat doesn't just bust in half and neither will this.

[@benolofson9732]

Fiberglass boats have frame rails and a keel and stringers, they are also extremely thick 3/8th ish usually, they also do snap in half, spent 7 years building boats, his "monocoque" will absolutely fail.

[@BuilderCreator]

Boats- 3/8 thick random oriented strand and polyester with a length of over 4 meters. Arete - less than 2 meters long, 1/2"+thick, S-glass, epoxy, planed fiber orientation.

[@waynemanning3262]

Composites work so well they make submarines out of it, sorry was that too soon? BTW, I built/repaired fiberglass boats as well and I have seen various composites fail as well, the big problem is being able to detect the damage first as it can look good from the outside and be seriously compromised in areas you can’t see.

[@benolofson9732]

@BuilderCreator the "load" on a hull is almost evenly dispersed across its beam and length, a cars is not, its focused on a area mostly the sills, but theirs good reason a monocoque is not fiberglass and is not done via wet layup.

[@benolofson9732]

@BuilderCreator look you've done great work but do you really have the hubris to say that everyone ever who builds cars all those companies engineers builders ect are wrong? If mclaren or Koenigsegg could've save 10's of millions of dollars on enclaves and tooling don't you think they would of?

[@moagoo5714]

Great video!

[@PulsechainProfits]

I LOVE this. Ive always wanted to learn more about the engineering on how to make things strong. Do your have a video explaining how you engineer the loads in CAD?

[@gothseph]

The one who doubt are inexperience in engineering. These design are appropriate to its purpose. I love it❤

[@DericO-rz3be]

Awesome.. *This tow job has me beaming*

[@jasonhaaksma8419]

Not that I’m one of the doubters but did you allow for the fact that the closer the load got to the fulcrum point the less weight would be on the strap? Not that it matters much because the care is going to be plenty strong enough to be safe (likely safer than most vehicles currently on the road at the moment especially those built before the 1980s).

[@BuilderCreator]

I did say at the beginning that it was scientific, but not accurate. Ha! It did work to show the drastic difference between samples, however. Crash safety, is knowing how to leap from your motorcycle at the moment of impact, to diminish the flight distance. ;)

[@alfreddominguez2750]

I like the composite foam core samples since im considering buying a composite camper for my truck and hopefully not building it. The industry uses wood framing, which im thinking is a waste. Dead weight, especially on a 1500 series truck. Cheers!

[@BuilderCreator]

I have a test panel I created for the Leviathan project; 2 inch extruded styrene foam, backed on each side with only two layers of glass and you could drive over it!

[@alfreddominguez2750]

@BuilderCreator awesome! That would be strong enough to sustain the cab over bed. I would build the two side walls and roof like that and a separate tub. Then bond them together.

[@beardoe6874]

Be careful with your use of uni. Typically it is used with several layers and altrenating strand orientation. Unidirectional fiber is extremely ansi-isotropic and the loads in a chassis aren't always coming from the same direction (especially in a crash) so rather than putting all of the strength in one direction you need to mix it up. I've seen shockingly light weight construction with fiberglass that didn't fail (but it flexed a lot) and 6-8 layer layups that were unimaginably stiff. If you have 5 layers for the body and more for the tub, you should be fine if your subframe attachment spreads the load over a large enough surface on your tub.

[@BuilderCreator]

Yes, and as mentioned, the Uni layers are all congregated with layers of Biaxial cloth, mostly running at 45 degrees.

[@markdorman52]

More great info! I stopped using polyester and gelcoat even for non-stressed parts and have been using epoxy /glass and carbon along with nomex honeycomb from Boeing surpluses and have made some seriously stiff composite doors for 2nd Gen Firebird that weigh only 10 lb 15 oz including inner door panels. These are BIG (60 inch long doors) and are arrow straight, will look factory when painted. All hand laid. Epoxy to fiber is only 12 - 15 % more than vacuum bagged as weighed.

[@BuilderCreator]

Sounds right in there. Now if you could only get hold of some "transparent aluminum" to reduce the weight of the glass! ;)

[@viniciusweillerdosreis3291]

Very good explanation. You’ll probably add a steel cage inside also? And I wonder about what a crash would do to the structure… do you have structures made to fail and absorb the impact as well? Thanks for all the videos, they’re awesome. Hope to see it finished soon!

[@BuilderCreator]

The subframes have crash structures, and the rear subframe/engine is designed to break away in a serious crash. Here is a video talking about the interior steel roll bar -kzbin.info/www/bejne/bWSZfYVpq8-ig5Isi=Bs6EHRak5x-luN5j

[@HolisticPatriots]

Looking forward in seeing the final creation. While enjoying the process regardless of how long it takes. What would you do when your car is complete and you get offers to sell it?

[@BuilderCreator]

If I can get a dollar an hour for my labor, who could afford it. Ha!

[@OgamiItto70]

I don't remember the exact schedule of the "monocoque tub" layup. My only concern would be for strength against puncture intrusion, especially from below. Kevlar reinforcing down there, I hope?

[@cjhuberty]

Another great video!

[@JeffGillis-lv1rz]

Gotcha. So it’s not actually a prototype but rather a personal project to build a one of a kind car where you built everything that parts replication is not per se a requirement. Best of luck with your artwork.

[@BennHerr]

Don't forget the first Meyers Manx were all fiberglass - no VW floorpan. They worked fine. The later "production" models used a VW pan to ease the building process for a beginner.

[@BuilderCreator]

Yep! Probably more Meyers Manxs out there than all the other mentions combined.

[@stephengirling7859]

Simply fabulous!

[@huntervassar8691]

Very visual very helpful very informative

[@xxorlandoxxog5995]

You’re my awesome genius teacher ❤

[@BuilderCreator]

Thank you! 😃

[@kowalskitk4]

Great video. thanks for sharing

[@knobudotus]

Yes, I do believe you did fall for it. But you have given the best response to the nay sayers who may not watch this video and learn anything. Either way, I commend you on lifting those weights and blocks. There are those of us that appreciate all of your efforts. Thank you for the great content!!

[@BuilderCreator]

Build a car, make a video and stay healthy with a workout, all in one! ;)

[@agnbmotorsportsallgasnobra9470]

whats your opinion on CFRP ? i have a carbon body from an BMW i8. it does have crash damage on the driver side A pillar, I hope i can repair it. But what do you think about cfrp strenght capabilities ?

[@BuilderCreator]

Repairs are never as strong as the original layup, but that is true of any car repair, composite or metal. You should be able to get it back into condition to keep you safe, should the car encounter a second A pillar mishap.

[@agnbmotorsportsallgasnobra9470]

@@BuilderCreator okay thank you, that gives me some hope. I really appreciate all the videos man. I could never learn this stuff anywhere else 🙏💯

[@Tricknologyinc]

How did you calculate the total weight for the cement blocks (not cinder BTW), since a significant portion of the load between the strap and the outrigger support? You can choose either the strap or the out rigger as your fulcrum point, and measure the distance from each block center to the fulcrum in a ratio with the distance between both supports (strap & outrigger). If the outrigger is 20 times the distance from the strap than the load center, you must reduce your effective load to 95% of the actual weight. 10 to 1 would knock you down to 90%. Your rig looks like roughly a 5 to 1 distribution depending on what blocks are placed where...

[@BuilderCreator]

I could reduce the number of engineering constants if you would submit $5000 dollars for a nice little used Zwick composite testing rig (plus $2000 for shipping from Slovenia). It was all for a point of discussion, not submission for a military contract. Straining at nats. P.S. I live within a hundred miles of 5 large inactive volcanoes and several thousand extinct cinder cones. They do indeed still make cinder blocks here in the Pacific Northwest.

[@oldieman730]

Thank you, I learned a lot today.

[@mw7492]

Why not just do a torsional rigidity test to validate your design?

I was really hoping to see that in this video, but unfortunately never happened. At least we learnt how a bridge works.

[@BuilderCreator]

Hopefully I will get to that test, but the tub is still not done. I am still verifying some mounting points for the center differential before I can do the final lamination. P.S. I need lots of gold bars to use on the test, as cinder blocks are too light. Please forward all you have.

[@mw7492]

​@@BuilderCreator Oh boy. Being 5 years in and not having the basic structure of the car done isn't confidence inspiring. Do you really have an engineering degree?

[@carbonfiber8071]

I used to build composite aircraft. Kit production and complete planes. There is a reason that carbon fiber is usually used to make a monocoque chassis. I know what it felt like to fly in a carbon plane versus a glass one. (Berkut vs. Long-Ez for instance) All you had to do to really understand was grab the vertical fin on the end of the wing of each plane and shake it, there is a noticeable difference in feel. The Berkut is way more sensitive in flight from the stiffer airframe. It's like comparing a street car to a race car for instance. The carbon fiber was so much more rigid it was ridiculous. It may not be whether it breaks, but if it flexes too much for the amount of power/cornering loads that you plan to achieve. The design and layup schedule will dictate that, but it's always a smaller layup schedule for the same rigidity with carbon fiber. Did the monocoque get heat cycled for the cure?

[@LupusMechanicus]

your mom got heat cycled for the cure

[@BuilderCreator]

All true, but I have answered the $20K dollar difference question before. When I get to the aircraft, it will be carbon fiber (weight counts) or sitka and fabric.

[@carbonfiber8071]

@@BuilderCreator I am biased... lol.

[@carbonfiber8071]

@@BuilderCreator The fiberglass planes I built WERE light, just not as stiff as carbon ones.

[@playdav485]

hi will the car require adhesive rubber panels to absorb vibration?

[@BuilderCreator]

Yes, it will have sound deadening insulation in the cabin.

[@mikeleonard8031]

He is a damn good engineer and I must say I learned a few tricks from Jay. Don’t like to work with fibreglass though.Too much itching.😂

[@Alumni6042]

Great video. Can you help a guy out. I'm designing a composite wing. My thoughts are that the compression is on the upper surface as the load is from beneath or the under side. If my idea is correct, where would you place more layers of glass? On the top or on the bottom?

[@BuilderCreator]

A wing should be thought of as a tube with the possibility of loads from any direction, Then you should design a spar to handle the dynamic loads. The spar should distribute 65% of the max load from up lift and 35% from down loads. Wrap your wing with 66% of the fibers going at 45 degrees from the root to prevent twisting. The spar should bond to the top and bottom skins.

[@eetack]

Your car is built in tension, how are you testing tension, if your samples have no anchor points? Deflection without anchoring is going to be much weaker, since the fibers will be bending much more, causing all kinds of damage to the bonding medium.

[@joshiek7839]

A chassis driving down the road isn’t anchored to the ground…

[@vicmontes7314]

As an architect that does his own structural engineering (most of the time) it took one particular structures professor to open my mind to beams and the loads within them...Horizontal Shear was the most epiphanal. That said, I find the strength of diaphragms far more fascinating. BTW, we architects are a bit persnikity about the difference between FORM and SHAPE. Shape implies a 2D component and Form a 3D one, clearly with dynamic loads in vehicles 3D is infinitely more complex... Respect to Naval Architects... those guys can analyze a twisted beam... 😊

[@BuilderCreator]

I worked a few years for a structural engineer that was also the professor at the State college; that's how I got into architectural design. My "epiphanal" moment was when I realized most materials will work with the right connector. It won't be long before high-priced software to do serious calculations (FEA)will be replaced by Ai that just needs a 3D model.

[@vicmontes7314]

@@BuilderCreator Ah yes, I taught Urban Design to upper class college kids at a VA University. Topic got around buildings in some detail... Blew some minds when I said "forget 3D Printing; wait 'till you kids are all old like me and buildings begin to be bioengineering". Your one of my fave channels!

[@BuilderCreator]

@@vicmontes7314 I remember back in the 80s someone was building a steel mesh frame and then placing that frame in the ocean with an electrical anode attached to it and "growing" calcium structures. How about 3D printing a thin shell and reinforce it with an internal "grown" crystal structure? We are about to see some really crazy tech!

[@JerryDLTN]

What amount of force (twisting, bending, etc) are you having to protect against? Is the weight of the car once moving? Is the weight of the car times G-force? Much do the forces increase from ~10 mph versus 110 mph?

[@BuilderCreator]

Extreme stiffness is needed for cars built to take corners at 3+Gs. As I'm after a top speed goal and good street performance, I can sacrifice some stiffness to comfort and cost.

[@peterpeugeotsaab]

My fatherinlaw built a Varieze airplane in glassfibre and flew it hard for 20+ years whitout problems so im sure your build will work 💯%

[@BuilderCreator]

Even if it doesn't, I will not be falling 10,000 feet after I find out there was a problem. Ha!

[@peterpeugeotsaab]

@@BuilderCreator True👍

[@S2NAZ]

Really well explained. You taught me something I was never educated on. Thank you 👍🏻 Subscribing 👍🏻

[@BuilderCreator]

Welcome aboard! You almost pushed us to the 100K subscriber mark.

[@cursetrynd461]

how can you clean all the resin on the brush ??

[@kenecchi]

Great video! I've always found S-glass to be more expensive and harder to come by than carbon fiber though; I'd prefer to use it for making body panels if I could get it because of its nicer mode of failure.

[@BuilderCreator]

Almost every vendor caries some S-Glass. The selection may not be as vast as E and Carbon, but it's out there

[@paulleeson1218]

If someone like Gordon Murray commented & said "woah buddy, strength ?" I'd pay attention, some random youtube commenter though ? not quite so much, keep doing what you're doing ...Nil carborundum illegitimi :)

[@BuilderCreator]

For sure. I do have a very good friend who is a "very" experienced aerospace engineer. When he gets worried, I will get worried.

[@theohallmd]

Pardon the question. Did you finish the car? I’ve been looking for a road test video but haven’t been able to find it.

[@billynotocampanella8296]

Will you be selling kits of the body and blue prints on the chassis

[@BuilderCreator]

Not for this prototype, but it could lead to a second generation "perfected" model.

[@lometatron357]

What software you used for the design?

[@davecooper5951]

Impressive project. I especially liked the idea of a kit-based ECU system - would like to see how you set it up. By the way, how did you decide on your spring and roll bar rates ? (I used to provide consultancy in this area)....I'm currently building a Le-Mans style racing sportscar - mix of aluminium and carbon honeycomb. I decided on Aluminium honeycomb for the main bulkheads (as an ex-racer, I've seen too many drivers with smashed up legs !). My son may be driving mine one day.....

[@BuilderCreator]

Spring rate was a bit of an educated guess on the car's final weight, and what springs were available for the coil overs I purchased. Roll rate will be tuned by machining the torque bars diameter.

[@davecooper5951]

@@BuilderCreator The main thing about spring rates on short travel dampers is to make sure they don't go 'coil-bound'. If that happens, you'll have to choose your bump rubbers very carefully (otherwise the rate will go to infinity !). For the roll bars, the racer's approach is to use variable length lever arms - very effective and a good chassis tuning tool. If packaging is an issue, you could also consider torsion bars (more compact installation). Do the Math(s) first.....

[@BuilderCreator]

@@davecooper5951 That is my system, as you explain. I have torsion bars terminating with lever arms drilled for adjustable length. Plus as mentioned before I can reduce the diameter of the torsion bars to soften them up if needed.

[@noanyobiseniss7462]

The 787 fleet will fail before this car!

[@telecomwiz2004]

Hella impressive. But why not show the subframe attachments. and test the subframes as well?

[@BuilderCreator]

You can catch a lot of the subframe attachment in previous videos. I'm Sure I will show more when I start a final assembly.

[@netmaster88]

Awesome project. I hope you take it to SEMA 😀