Red Bull RB8 Renault

[Nando]

You ask questions that someone who doesn't know anything about aerodynamics wouldn't ask. So, give yourself a little more credit, and browse through the last 10-20 pages in this thread. I'm pretty sure everything but the kitchen sink has been thrown at this topic. (That's all a very sheepish way of saying, "I have no idea.")

I´ve just read some articles and watched pictures, i know nothing about low pressures, high pressures, or how air interacts with objects.

I have read this whole thread, it seems there are two guys that "know" aero but they have two completely different opinions on it so that does not help much

thanks anyway!

[hardingfv32]

It means that exhaust flow has accelerated the flow around it. So what does it matter about the flow 100-200mm after the pipe?

Because the exhaust flow must eventually match the body air flow. The s smikle simulation demonstrates this.

Brian

[bhall]

[...] it seems there are two guys that "know" aero but they have two completely different opinions on it so that does not help much

For what it's worth, my opinion on the subject is that I think the intent is to keep the exhaust flow outboard to recreate some semblance of previous EBDs. I cannot imagine a team going through the hassle to implement the layout as currently configured with any other goal in mind. There are far simpler and more effective ways to exit the exhaust down the center - perfectly legal, too - if that's the goal.

[Nando]

For what it's worth, my opinion on the subject is that I think the intent is to keep the exhaust flow outboard to recreate some semblance of previous EBDs. I cannot imagine a team going through the hassle to implement the layout as currently configured with any other goal in mind. There are far more effective ways to exit the exhaust down the center - and are perfectly legal to implement - if that's the goal.

Maybe he was trying to kill two birds with one stone?
Sounds logical what you are saying.

What would be the purpose of the sidepod intake? gain some of the open space that has been removed by the new sidepods?

[bhall]

Do you mean the so-called "bridge/tunnel" when you say sidepod intake?

[hardingfv32]

I have read this whole thread, it seems there are two guys that "know" aero but they have two completely different opinions on it so that does not help much :)

thanks anyway!

The cars are not the same for a reason. The people who design them have the best CFD, wind tunnels, and are paid to figure these things out. I doubt they would agree on the same answer. We are just volunteer amateurs with no facilities!

Brian

[hardingfv32]

I think the intent is to keep the exhaust flow outboard to recreate some semblance of previous EBDs.

Blow the whole diffuser or blow the edge for sealing, etc.?

Brian

[hardingfv32]

n Smikle's sim was awesome, but I don't think you can correlate the two exhausts as some here are trying to do. They're two separate solutions.

I would claim the value with n smikle's sim is to demonstrate how slow the flow is out of the exhaust tip and say 100-200 mm from the tip. While everything matters, there just is not much there anymore compared to last year.

I would claim a mistake in the exhaust system layout might not even be noticeable compared to other issues that detract from overall car performance. RB can miss on the exhaust subject and their package would easily mask it.

Brian

[bhall]

Blow the whole diffuser or blow the edge for sealing, etc.?

This is what I said way back on page 71. (I'm still rather fond of how I phrased it.)

The "bridge" is just the most extremely undercut sidepod in F1 history. I think they're cramming all the air they possibly can down the middle in an attempt to force the exhaust to stay outboard.

In a manner of speaking, they're using the air flow over the car to seal off the exhaust so that the exhaust can seal off the air flow under the car.

It should be noted that such a solution is nowhere nearly as effective as pre-2012 EBDs. That the team ran RB8 with noticeably less rake after the exhaust upgrade bears this out.

At any rate, I haven't seen anything to change my mind about the system. Then again, I'm barely even qualified to be an armchair aerodynamicist.

[Jimi_Hendrix_1967]

Som whats the verdict? Do you guys like the car/concept?

(I have always wanted to ask you... do they actually have that giant rock concert in heaven?)

I have Gilles Villeneuve as limo driver

I cant wait to see the rb8 in action around albert park!

[cossie]

is the blowing of the exhaust's to the diffuser in line with the sprite of the regulation or a big gray area

[MIKEY_!]

Not really in line with the spirit of the rules I think, but totally legal anyway. The spirit of the rules and legality are definitely two different things.

[Adrian Newby]

Still wrong.

It won't go "less inboard", the exhaust will go outward, toward the tire at lower speeds, and be pushed more straight back at higher speeds.

The exhaust itself doesn't point outward.

The shroud/duct introduces it with greater cross-flow to ambient. That wouldn't be like that if they intended it to flow outward.

Instead the exhaust itself would point outward.

The exhaust does point outward: 10 degrees outward (and complies with another one of those regulations things you don't know or care about). The channel then guides it even farther outward.

[Adrian Newby]

Notice how the bodywork above the exhaust (and below the bull's front legs) bulges out. This would tend to push that air outward also... exactly where you would want it to push outward if you wanted the exhaust to go outward... a latticework of coincidence!

[Adrian Newby]

Hey, remember this, kilcoo's crowing, crowning glory, where he claims victory?

Finally!

We can end this farce once and for all.

As is clearly viewable able from the heat damage, the exhaust flows down the ramp at lower speeds and even further inboard at higher speeds.

Now, where does that put it with respect to the rear wheel?



Thank you and good night.

If you line up the burned area on the top photo with that same area on the bottom photo you will see that they are directly in line with the diffuser sealing area. The majority of the exhaust does not "flow down the ramp", it flows over the side.

"Thank you and good night." :0)