Cheers for the support mate, yes it is really tight. I even planned to do a RP of one of the model and test it in the wind tunnel (1/10 scale) but I am afraid that I won't have time. Who knows but it is really tight.jamsbong wrote:Sounds like you have a tight schedule. Well good luck with the project! Be sure to update your blog when you can.
>> HERE! <<Yes! It is now time to present the 3D model of the car I have designed. It is the first version, which implicates that there will be devices added or changed, modified, and so on, to meet the objectives that I specified some time ago. I must also repeat that I have taken the WRC version as a base car (which I presented already as well). My job here was to create this parts and assemble them on the car. All the modifications done are not affecting the chassis structure so they can be added or removed easily (this is also valid for real life).
As you can see, it has got a fairly large rear wing assembly consisting of a main element on top with a flap over it, and a lower element. The planes are connected through very large end plates and fixed to the car by 4 swan-type mounts to ensure the downforce produced does not break them. The diffuser is divided into a large central section that starts at about the rear wheel axis and expends nicely up, and a smaller section behind the wheels where extra flaps helps to use this “lost” area efficiently. We can also slightly see the (blue) radiator in the boot with its opening.
Moving to the side now, we see the cut in the rear door to feed the radiator with air, and a small wing below it to help guiding the air inside. The splitter end plates extend quite far back (over the front wheel) and far in upfront as well to use the air stagnation there at the maximum. We also see that the car is sitting lower (80[mm] actually) than the WRC version, as the Pikes Peak race is now fully asphalted. The rear tyres width has been increased by 50[mm] and the rear arches extended accordingly!
Finally, a front view of the car with its sister car on the left, showing that the engine cooling has been enhanced and that winglets have been added to the side of the front splitter end plates. Under this splitter are diffusers (that I will show in the next update), but you already get the idea.
Again, this is the “v1″, so after the aerodynamic simulations, parts will be changed to enhance the performance of the car, but to be honest I have already conducted quick calibrating simulation, and results looks already very very promising, but I will not say too much for now!
Thanks!Blanchimont wrote:It looks great!
Are you planning to simulate the different versions of the car through a laptime simulator like virtual stopwatch ( http://www.competition-car-engineering.com/ ) or optimumlap ( http://www.optimumg.com/software/optimumlap/ ) to get some numbers on how effective your aero upgrades are for a given track?
For me that would be the next logical step after calculating cd and cl numbers by CFD.
Thanks!variante wrote:Good start!
I guess, just looking at it, you're not far from your target.
But why don't you attach those pylons, the four mounts i mean, to the beam wing? Structural reasons?
Also, if i were you, i would work a lot with that beam wing (looks like it will almost produce lift with that AoA), especially considering the help it could give to extract air from the diffuser.
You might want to consider vortex generators on the roof as well.
Great project BTW
Then it makes sense! Yes why not that sounds really good, I will have a look at that and hopefully can manage something.Blanchimont wrote:I forgot to mention that optimumlap is freeware and you can create your own simple tracks with this software.
Although i don't know how accurate it is, it is great to change certain parameters and get nice plots from the changes.
The plot is a surface that represents the lap time dependent from two variables (power, downforce, drag, weight,...).
You should at least have a quick look over the software, i would say!
Your point makes sense! Yes it creates a high amount of drag, so maybe I will cut a bit the end plate like they are doing on F1 front wings endplates. That's definitely an area that needs work there! I value all points of views, good or bad ones, you learn from everything so I'm happy people post their views on that, don't worry! There is so much to do on an "unlimited" car that it is sometimes difficult to keep feets on the ground.Alonso Fan wrote:looks good!
the only thing i'm concerned about is that the front wing has two large fins attached to the body of the car. this, theoretically wouldn't allow air hitting the front bumper to spill out around the car, and thus, would create vast amounts of drag, as the air has nowhere to go except hit the bumper head on. i would advise making it so that the front wing creates downforce, and guides air to that magnificent rear wing you have there. i know its only v1, so this is just some advice for your next version
love the rear wing btw
i don't mean to say the body kit is bad, its still a very good attempt, much better than i could do myself
That's the whole point of the end plate fences, trapping the air, creating high pressure over the splitter. That's simply how the splitter works. And yes, it adds drag, however I doubt it would be more draggy than a front wing, and if it is, it also generates more downforce. Also, there is (virtual) power to turn into downforce, so drag isnt that big of a problem.Alonso Fan wrote:
the only thing i'm concerned about is that the front wing has two large fins attached to the body of the car. this, theoretically wouldn't allow air hitting the front bumper to spill out around the car, and thus, would create vast amounts of drag, as the air has nowhere to go except hit the bumper head on.
I didn't explain my point very well, i'll be more precise:MadMatt wrote:I think that the end plates will be enough to hold the beam wing, so I don't have these huge mounts going all the way down.
Ah yes I see now! I already thought about it but I couldn't come up with an elegant design. I might think about it again tho, but since I have these mounts, I recon they are kind of an "unique" feature which will make the car more recognizable. I won't sacrifice performance on behalf of design, but at the moment I will keep this design. It is quite tricky to make such a huge assembly look good with the rest of the car!variante wrote:I didn't explain my point very well, i'll be more precise:MadMatt wrote:I think that the end plates will be enough to hold the beam wing, so I don't have these huge mounts going all the way down.
in this configuration the car has 4 pylons placed in a sensible position, thus creating a good amount of drag and disturbing the flow to the rear wing. Moreover you have 2 endplates, which are supposed to be thick enough to firmly hold the beam wing. This means a total of 6 thick elements hitting fast moving air with consequences that you can imagine.
My proposal is to get rid of 2 pylons from the main wing, and instead of those, placing 2 pylons on the beam wing (linking the beam wing to the radiator outlet: a non sensible area.
With this solution you could drastically reduce the thickness of the endplates, which wouldn't be structural elements anymore.
Doing so you would have only 2 thick elements hitting fast moving air.
your point also makes sense!wesley123 wrote:
That's the whole point of the end plate fences, trapping the air, creating high pressure over the splitter. That's simply how the splitter works. And yes, it adds drag, however I doubt it would be more draggy than a front wing, and if it is, it also generates more downforce. Also, there is (virtual) power to turn into downforce, so drag isnt that big of a problem.
Slots in the end plate wouldnt allow more air to the rear wing. Why? This is based on a normal street car(although stripped down), This street car houses more passengers and luxury stuff. It isnt a f1 car or an LMP. In those cases, air to the side of the car would indeed help. Here, not so much.Alonso Fan wrote:i was just trying to find other ways of using the air. as MadMat said, making slots in the front wing end plates would allow sufficient air to the rear wing.wesley123 wrote:
That's the whole point of the end plate fences, trapping the air, creating high pressure over the splitter. That's simply how the splitter works. And yes, it adds drag, however I doubt it would be more draggy than a front wing, and if it is, it also generates more downforce. Also, there is (virtual) power to turn into downforce, so drag isnt that big of a problem.
