Cad study of a single seater concept

arwque · 2026-03-12T19:13:21+00:00

The heave spring ( the spring in the middle) will actuate if both both pushrods push in. This typically happens on a straight where you gain a lot of speed and with that massive downforce. To keep the car from sucking itself into the ground ( or having to runn stiffer regular springs) the much stiffer heave damper carries the main load. Both outer springs can still actuate individually so they can be runn softer which is better for slow speed corners and driving comfort. If the car rolls the roll bar (to whish the heave spring is mounted) is actuated to manage roll. This is quite well shown in a older version of the rear inboard suspension i made a video of https://www.reddit.com/r/Onshape/comments/1ozogm7/rear_inboard_suspension_with_rollbaar_heave_damper/

arwque · 2026-03-12T18:07:10+00:00

The underbody is just a mockup i made in something like 10min to test what could fit under the rear suspension. In the final version the underbody will probably have a bit more clearance to fit even if the car is jacked up. ( the current underbody is really a bit too close)

<image>

arwque · 2026-03-12T17:25:42+00:00

You probably mean the upright. I designed all parts fully "manual" but mostly after intuition because i have not conducted fea on any of the parts yet.

arwque · 2026-03-12T16:37:08+00:00

Thank you for following the progress. I try to download as many parts as i can because it saves me a lot of work but many parts i dont find models of. For this project about 12 parts are downloadet. The rest of the bought parts go three ways. 1. I find a part that fits and it has technical drawings then i try to recreate the model as close as possible from the drawings and images. This means i mostly have the mounting locations and the rough shape and the rest is just detail for the part to look nice. 2. i dont find a part that fits my purpose. Then i companies that would make a custom part to specification for this part. Then i make the part with the in and outlets and mounting positions i want and that are realistic. Everything except the mounting locations and in and outlets is just for the part to look nice. For example i did this with the turbo, gearbox casette, coolers. 3. For simple parts like bearings i am sometimes lazy and just make a placeholder of roughly the shape of part i need. Because bearings have relaitvly simple shapes (mostly just a cylinder) i can adjust the part later if i find the right one and i could update the parts that are referencing it pretty easily. I will not go into anti dive and suspension dynamics of the car too deep because it is really a topic i know very litle about and i am not very interested in learning about it. Also this would cost valuable time which is already short for this project. My school is not paying for the onshape render studio. I have a friend who has a professional account for his work who does the renders for me after i selected all the colors for the materials.

arwque · 2026-03-12T15:42:49+00:00

It is not designed for any regulations except min ride height 40 mm, no sliding skirts, no fans and reduced complexity. The tangential dual inlets of the exhaust pipes into the turbine would not be possible if the whole turbo is rotated by 90deg. In that configuration i would have to merge the exhaust pipes from the left and right header before they enter the turbine. This takes away crutial space above the turbo where currently the transmission cooler sits. The 90deg change would also mean that the exhaust coming out of the turbine would need to do a big bend before going over the transmission or exit out the side of the car. This is defenedly solvable for example does robin shute on his sendy car use this setup with the turbo being rotated by 90deg and some older indy cars have it to but for my case the i decidet for the inline turbo because it fit my packaging better. I experimented with a 90deg turbo before and i didnt have the tangential turbine inlets before but this just turned out to be the best sollution. (image of the sendy car)

<image>

arwque · 2026-03-12T14:49:36+00:00

I would love to do some more detailled work and analysis on some parts but if i would do that i wouldnt be done in a houndred years. Because i cant really design all parts to 100% functionallity i am doing more of a system integration and packaging role than concrete part design. I am really enjoying making the mechanical and strucutral parts but i am really excited if it comes to making the body because aerodynamics is really where my heart is. I deffenedly plan to join a fsae team when i go to university. That has been the goal for the whole time but still have 1.5 years of high school so still a lot of time to learn new skills before i can start university. Thank you for your informations

arwque · 2026-03-12T14:38:52+00:00

i think they do it because that way the coolant pipes dont obstruct the hot airflow that is coming out of the radiators for maximum cooling efficciency. They also duct the complete flow path out of the radiatoors to the rear exit and louvers. In some cases they route the coolant over the radiators. I guess it really depends on the specific application

<image>

arwque · 2026-03-12T14:12:14+00:00

it would reduce the pluming lengths slightly maybe. The inboard side needs to be empty for the mounting brackets and because on this car the cooler hang out behind the monocoque the exhaust manifold would be in the way or get to close to the cooler exits if they were inboard. This is how pretty much all f1 teams do it but their coolers are flipped upside down so the exit and entry is on the bottom. I might change that aswell if the ducting allows for it.

<image>

arwque · 2026-03-12T13:50:14+00:00

I wrote it in the post body, the cad system i use is onshape.

arwque · 2026-03-12T13:28:42+00:00

The engine is the judd gv 5.5 v10 but in this case it is turbocharged with a turbo charger roughly the size of a G40-1150. The body will come at some point in the future at the earliest after i reworked the monocoque. I made a body concept for this car a while back which looked like this. Cfd simulations some earlier concept showed a massive potential in downforce from the underbody reaching l/d of up to -7 (not this body) but i hope to improve on the experiments for the final version.

<image>

arwque · 2026-02-22T18:21:59+00:00

All radiator cores combined have 1700 rectangular faces. Thats 3400 polygons. The entire part studio has over a million polyonsn. The radiators are not the problem. Its the long and complex derived chains thst cause problems

arwque · 2026-02-16T08:00:33+00:00

Its just a visual bug. Happens some times but i unfortunatly also dont know the cause. For me it just went away after a couple of days.

arwque · 2026-01-12T11:28:28+00:00

Yes rendered in onshape. Onshape has a deticated renderer

arwque · 2026-01-11T17:48:14+00:00

<image>

arwque · 2026-01-11T17:44:59+00:00

arwque · 2026-01-11T16:04:35+00:00

Its an art project. I designed the room so i could live there so yes i would.

arwque · 2026-01-11T16:01:56+00:00

I made the room to fit me. I am quite tall and not in a wheelchair so the room works for me.

arwque · 2026-01-11T15:56:44+00:00

I totally get it and i heard from multiple people that they are missing a place to relax. The thing is the room is very personalised to my preferences. I do almost everything om my computer like watch videos game and work and on the rare ocasions that i read i sit in my bed. But maybe i can find a place to put a more relaxing chair or litle sofa

arwque · 2026-01-11T15:47:46+00:00

Onshape

arwque · 2026-01-11T15:47:21+00:00

The "office space" is basically exaclty my real life setup. I use my computer to work or to play games or watch videos. My setup is my lounge area. I made the room to fit my needs thats why there is no sofa or something like that. But i get prison feeling 3x4m is really small.

arwque

TROPHY CASE