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photo of a Coupe in a wind tunnel #1000178
13/03/2010 00:22
13/03/2010 00:22

M
MichaelZ
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MichaelZ
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M



Maybe there were some pics in brochures or commercials?

It usually shows airflows around the body...

Anyone?

Re: photo of a Coupe in a wind tunnel [Re: ] #1000585
14/03/2010 01:21
14/03/2010 01:21

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Per
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Per
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never seen any, other than the fact of CX 0.31 which is pretty low drag. I suppose the LE/Plus-kit affected that some.. 0.305?

Re: photo of a Coupe in a wind tunnel [Re: ] #1000623
14/03/2010 11:20
14/03/2010 11:20
Joined: Feb 2006
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Essex
Trappy Offline
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Autocar and FIAT quote 0.33 but I have seen 0.31 and 0.32 posted around the internet.


F****** b****** thing...
Re: photo of a Coupe in a wind tunnel [Re: Trappy] #1000671
14/03/2010 12:35
14/03/2010 12:35
Joined: Dec 2005
Posts: 4,839
Haslemere, Surrey
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Mark_S Offline
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Haslemere, Surrey
I was going to post on this general subject. I have always noticed with the Coupe, unlike any other car I have dad, when I look in rear view mirror in rain, I see the spray coming together (both sides pulling in) in a vortex. I asssumed this was the result of great aerodynamics. Other cars just show a mass of uncordinated spray, with no form or shape.

The coupe is just so special cool


997 C4S
Re: photo of a Coupe in a wind tunnel [Re: ] #1000715
14/03/2010 13:42
14/03/2010 13:42

M
MichaelZ
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MichaelZ
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Originally Posted by Per
never seen any, other than the fact of CX 0.31 which is pretty low drag. I suppose the LE/Plus-kit affected that some.. 0.305?


Even 0,32 is just between Farrari Enzo (0,30) and Lamborghini (0,33)! ))))

The questions is that I'm in procees of making a custom kit for my coupe. Small wide body + diffusors + bottom panels etc.

Minimum of looking, maximum of efficiency on a track.

So my idea is to make small aerodinamic elements, that won't look like my grandma's favorite bench, but will do their job.

Re: photo of a Coupe in a wind tunnel [Re: ] #1000721
14/03/2010 13:52
14/03/2010 13:52
Joined: Feb 2006
Posts: 5,408
Essex
Trappy Offline
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Originally Posted by MichaelZ

Even 0,32 is just between Farrari Enzo (0,30) and Lamborghini (0,33)


It's also higher than a Vauxhall Calibra wink The coop does well aerodynamically because of it's low frontal area of 21.6 feet. The CDA (CD x frontal area) is therefore pretty good in any company. The thing is, those cars that generate good downforce also produce more drag. A Noble M400 is a good extreme example. It's very good from 0-120mph and on track, but you only need to look at the post 120mph performance and top speed and you wonder where that 425bhp went. All that downforce starts to work against it, both in terms of drag and of course, extra 'weight'.

Originally Posted by MichaelZ

So my idea is to make small aerodinamic elements, that won't look like my grandma's favorite bench, but will do their job.


The question is, how will you ever know if it's working?


F****** b****** thing...
Re: photo of a Coupe in a wind tunnel [Re: Trappy] #1000840
14/03/2010 17:23
14/03/2010 17:23

M
MichaelZ
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MichaelZ
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Originally Posted by Trappy
Originally Posted by MichaelZ

Even 0,32 is just between Farrari Enzo (0,30) and Lamborghini (0,33)


It's also higher than a Vauxhall Calibra wink The coop does well aerodynamically because of it's low frontal area of 21.6 feet. The CDA (CD x frontal area) is therefore pretty good in any company. The thing is, those cars that generate good downforce also produce more drag. A Noble M400 is a good extreme example. It's very good from 0-120mph and on track, but you only need to look at the post 120mph performance and top speed and you wonder where that 425bhp went. All that downforce starts to work against it, both in terms of drag and of course, extra 'weight'.

Originally Posted by MichaelZ

So my idea is to make small aerodinamic elements, that won't look like my grandma's favorite bench, but will do their job.


The question is, how will you ever know if it's working?



Well, we have a wind tunnel here in University of aviation )))

And also some elements will work in anycase - for example flat bottom o some rear diffusor. And they also look better then any spoilers etc...


Re: photo of a Coupe in a wind tunnel [Re: ] #1000846
14/03/2010 17:34
14/03/2010 17:34
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Jimbo Offline
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Is your tunnel large enough to fit a coupe inside smile


Re: photo of a Coupe in a wind tunnel [Re: Jimbo] #1000854
14/03/2010 17:47
14/03/2010 17:47

M
MichaelZ
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MichaelZ
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Originally Posted by Jimbo
Is your tunnel large enough to fit a coupe inside smile



They fit an airplane there ))))

Re: photo of a Coupe in a wind tunnel [Re: ] #1000858
14/03/2010 18:01
14/03/2010 18:01
Joined: Jul 2008
Posts: 12,644
Watford
MarioCirillo Offline
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Watford
Fancy putting one of our coupes in there? ;-)


Proud Owner of Rosso Speed LE041
Re: photo of a Coupe in a wind tunnel [Re: MarioCirillo] #1000861
14/03/2010 18:11
14/03/2010 18:11

M
MichaelZ
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MichaelZ
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Originally Posted by MarioCirillo
Fancy putting one of our coupes in there? ;-)


I will better make a small model for tests )))) Always dreamed about it!

They do so with the planes development btw )


Re: photo of a Coupe in a wind tunnel [Re: ] #1000876
14/03/2010 19:05
14/03/2010 19:05
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Jimbo Offline
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Yes, we have a model C-17 at work that was a wind tunnel model, quite expensive to build apparently as they are an exact aerodynamic model of the real thing.

Boeing didn't see the funny side of us trying to fly it across the room (which it didn't do very successfuly).


Re: photo of a Coupe in a wind tunnel [Re: Jimbo] #1001605
16/03/2010 08:31
16/03/2010 08:31

N
ngspawn
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ngspawn
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covered wheel rims will do a great job. flat fuel cap will add several km/h also

Re: photo of a Coupe in a wind tunnel [Re: Jimbo] #1001650
16/03/2010 10:40
16/03/2010 10:40

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Nobby
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Nobby
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Originally Posted by Jimbo
Boeing didn't see the funny side of us trying to fly it across the room (which it didn't do very successfuly).


laugh

Re: photo of a Coupe in a wind tunnel [Re: ] #1001696
16/03/2010 12:18
16/03/2010 12:18
Joined: Aug 2007
Posts: 394
Godalming
Taff Offline
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Posts: 394
Godalming
Originally Posted by Nobby
Originally Posted by Jimbo
Boeing didn't see the funny side of us trying to fly it across the room (which it didn't do very successfuly).


laugh

"Boeing Brick" catchy, much better than "panty liner" sorry "Dream Liner"

Re: photo of a Coupe in a wind tunnel [Re: Taff] #1002636
17/03/2010 21:05
17/03/2010 21:05
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Jimbo Offline
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You wouldn't catch me in a dream liner- a fully composite aircraft. One of our mostly composite planes had a lightening strike the other week, it took out the radome at the front and the elevator at the rear ! They don't conduct electricity very well !

Re: photo of a Coupe in a wind tunnel [Re: Jimbo] #1002803
18/03/2010 02:26
18/03/2010 02:26

R
Redd
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Redd
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pure CF doesnt conduct electricity. CF sandwich with a wire mesh in between should, just like a Faraday cage.

as strict as the FAA are with these things, i cant believe Boeing would have overlooked this most well known lightning strike issue with the 787.

redd

Re: photo of a Coupe in a wind tunnel [Re: ] #1002844
18/03/2010 09:16
18/03/2010 09:16
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Jimbo Offline
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Yep you've got it spot on Red, they lay a mesh under the upper composite layer, however, that mesh needs to be bonded at every single point throughout the entire airframe for it to work, also, think about this logically, pass a few million volts through a thin wire mesh that's encased in a substance that doesn't conduct so well.

I bet the structure will delaminate and lose all it's strength !

It's a problem with metal airframes too, rivets melt and reform with a lightening strike, a rivet that's done that offers no structural strength at all.

I'm not sure how far off topic we are at the moment. ? Has anyone had a lightening strike in a coupe, or to get it right back on track, has anyone had a lightening strike in a wind tunnel laugh

Re: photo of a Coupe in a wind tunnel [Re: Jimbo] #1003554
19/03/2010 04:20
19/03/2010 04:20

R
Redd
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Redd
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R



hehe sorry. i go all tingly whenever anyone starts talking aero... wink

redd

Re: photo of a Coupe in a wind tunnel [Re: ] #1003591
19/03/2010 09:15
19/03/2010 09:15
Joined: Dec 2005
Posts: 8,865
Lightwater, Surrey
DaveG Offline
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DaveG  Offline
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Posts: 8,865
Lightwater, Surrey
I love that bubbly chocolate too smile


1996 Portofino 20vt & 2000 Pearl White Plus
2008 Ferrari F430 & 2017 Fiat 124 Spider
Re: photo of a Coupe in a wind tunnel [Re: Jimbo] #1003632
19/03/2010 10:12
19/03/2010 10:12
Joined: Feb 2006
Posts: 5,408
Essex
Trappy Offline
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Originally Posted by Jimbo

Has anyone had a lightening strike in a coupe, or to get it right back on track, has anyone had a lightening strike in a wind tunnel laugh


I once saw one coming for me in the rear view mirror but, luckily, I was already in third... driving


F****** b****** thing...

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