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Old 01-24-2014, 01:57 AM
  #856  
Dubai944
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Originally Posted by 333pg333 View Post
Hope to know a bit more about this sort of thing next month myself. (No...no windtunnel...)
Push it off a cliff and film it on the way down?
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Old 01-24-2014, 02:14 AM
  #857  
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Originally Posted by Dubai944 View Post
I read Porsche said those rear wheel cutouts on the new car don't contribute much to aero and were mainly for aesthetics.
I read the same thing.

It's one thing to relieve pressure. It's another to chop the body panel. From what I hear you can vent the pressure without resorting to drastic cutting as shown (which I've seen in a lot of places... which everyone seems to have based on some Porsche test stuff).

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Old 01-24-2014, 03:04 AM
  #858  
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Plus I wonder how much turbulence you add to the airflow by having large abrupt panel cutouts and overexposed wheel wells.
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Old 01-24-2014, 08:09 AM
  #859  
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Originally Posted by Dubai944 View Post
Push it off a cliff and film it on the way down?
lol

Originally Posted by TonyG View Post
I read the same thing.

It's one thing to relieve pressure. It's another to chop the body panel. From what I hear you can vent the pressure without resorting to drastic cutting as shown (which I've seen in a lot of places... which everyone seems to have based on some Porsche test stuff).

TonyG
It's not just P test stuff. Plenty of others have done actual wind tunnel testing as well as CFD.

Originally Posted by Dubai944 View Post
Plus I wonder how much turbulence you add to the airflow by having large abrupt panel cutouts and overexposed wheel wells.
Fair point but I can't see a bunch of these people doing it for kicks.

It's academic to a degree as this car is going to be stupidly fast.
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Old 01-24-2014, 02:18 PM
  #860  
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Originally Posted by TonyG View Post
ETA on the track for testing is 10 days
Where?
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Old 01-24-2014, 02:42 PM
  #861  
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can't wait for even more pics!
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Old 01-25-2014, 07:40 AM
  #862  
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Originally Posted by 333pg333 View Post
Compared to you running the old square setup it will be interesting if you run say 280 and 330. You’d imagine more understeer but with your suspension setup being completely re modelled that’s anyone’s guess until you actually start your shakedowns.

Current Aero…meaning what people are using now on many racecars. A lot of cars are running with half the rear of the tyres showing due to no bodywork to relieve pressure. Hence your front vents.
Originally Posted by Dubai944 View Post
I read Porsche said those rear wheel cutouts on the new car don't contribute much to aero and were mainly for aesthetics.
Originally Posted by 333pg333 View Post
Sounds unlikely, plus there are more than just Porsche doing it. They're using wind tunnel and CFD to arrive at their conclusions. Hope to know a bit more about this sort of thing next month myself. (No...no windtunnel...)
IIRC one of the Flying Lizards cars lost some of it's rear fascia during a shunt at Sebring and had better laps times afterwards.
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Old 01-25-2014, 09:53 AM
  #863  
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Originally Posted by TonyG View Post
What you read on internet forums and what is reality are often two different things.

TonyG
But...but...but... I have been reading about this car on the internet forums....you mean its not real? Is the whole thing just a 1/18 scale diorama?

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Old 01-25-2014, 09:57 AM
  #864  
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Originally Posted by Dubai944 View Post
I read Porsche said those rear wheel cutouts on the new car don't contribute much to aero and were mainly for aesthetics.
Hmmmm, just the fact that Porsche (or any race team) says it doesn't work and yet it remains on the car lends more credence to that fact that it works and probably works well!

Deceit in motorsports? what's the world coming to?
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Old 01-25-2014, 02:29 PM
  #865  
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Originally Posted by acorad View Post
Where?
Not sure. Depends on the exact day.

But it will either be Willow Springs, AutoClub Speedway, or Buttonwillow (in that order) depending on where we can get on.

I'll know more next week.

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Old 01-25-2014, 07:57 PM
  #866  
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Originally Posted by Chris White View Post
Hmmmm, just the fact that Porsche (or any race team) says it doesn't work and yet it remains on the car lends more credence to that fact that it works and probably works well!

Deceit in motorsports? what's the world coming to?
What? I believe everything I read in Racecar Engineering magazine…

Actually I think the reference was more about the dive planes located behind the rear wheels which Hartmut Kristen suggested that there was nothing to them other than they looked good. I remember reading they gained overall efficiency with the new aero but still had problems with turbulence behind the rear wheels because the engine location compromised the diffuser design. So I am sure it works and letting pressure out of the wells is proven, but I am sure it's not perfect.


And, of course, big manufacturers never get aero wrong…….

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Old 01-25-2014, 09:31 PM
  #867  
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Of all the things I muck around with, by far aero is the one I struggle with the most... not conceptually, but in design and testing. So tough.
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Old 01-25-2014, 10:44 PM
  #868  
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I predict in the not too distant future top teams will be able to do testing at the track with a series of 3d printed parts that they can just click on and off the bodywork to test their respective merits. You heard it here first...

Looking forward to Tony testing this car soon. You'd have to anticipate quite a lot of testing to be done with a very different car than before.
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Old 01-26-2014, 02:49 PM
  #869  
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Originally Posted by 333pg333 View Post
I predict in the not too distant future top teams will be able to do testing at the track with a series of 3d printed parts that they can just click on and off the bodywork to test their respective merits. You heard it here first...

Looking forward to Tony testing this car soon. You'd have to anticipate quite a lot of testing to be done with a very different car than before.
I know 3d printed parts aren't quite up to the strength required for high speed (M0.6+) scale airplane wind tunnel testing. And that's with the fanciest/most expensive printers on the market; even ones that impregnate metal into the plastic. But that could be different at more reasonable speeds that a car would see
For the overall body I'd say it would work fine, but for thin aero like wings you'd definitely still need metal.
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Old 01-26-2014, 06:21 PM
  #870  
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There are 3D printers making metal parts now. At this stage the metal is more porous than could be used for certain motor parts but you'd have to assume that it won't be long until they come up with some material that can stand up to the pressure levels that we're talking about.
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