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Old 09-11-2020, 10:59 AM   #1 (permalink)
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Rear Spoilers vs 'template' contour

I've gone through 'template' comparisons of telephoto images and technical drawings, published over the decades in ROAD & TRACK. Many were in my photo-bucket archive, but I no longer have access to those, so I can only list them for now:
1964 Shelby Daytona Coupe
1969 Pontiac Trans Am Firebird
1980 Medusa concept ( ItalDesign)
1982 Pontiac Trans Am Firebird
1984 Pontiac Fiero
1985 Renault Alpine V-6
1988 Lotus Esprit Turbo
1990 Opel Calibra
1993 Ferrari 360 Modena
1995 Ferrari F355 Berlinetta
1997 Dodge Viper Coupe
1998 Toyota MR 2
2009 Nissan 370-Z Sport
2010 Honda Accord Crosstour
2011 Chevrolet VOLT-I
2012 Audi A7
2012 Subaru BRZ
2012 Audi TT RS Coupe
2013 Aston Martin Vanquish
2014 Audi RS5
2014 Chevrolet Camaro SS 1LE
2015 ACURA NSX
2015 Alfa Romeo 4C
2015 Lexus RC F
2016 Chevrolet Camaro SS
2016 Mercedes-Benz IAA concept ( with boat-tail extended )
2016 Porsche 911 GT3 RS ( fixed spoiler below wing )
2017 Porsche 911 Turbo S
2018 KIA Stinger GT
2020 Toyota GR Supra
2020 Porsche Taycan ( flip-up unit )
--------------------------------------------------------------------------------------
Since this thread will be easily accessible, I'll be able to add data as it becomes available.
Over time, I'll figure out about posting images. I lost over a month's income in the photo-bucket debacle and if I'm going to go to the expense of doing new images, I need an iron-clad guarantee that we won't lose any of them.

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Old 09-11-2020, 06:35 PM   #2 (permalink)
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Anyone who still believes the template shows where airflow goes simply has their eyes shut.

Tesla Model S not obeying the template:






Jaguar XE not obeying the template:





(Colder colour = high pressure):




Honda Insight not obeying the template:







Honda Legend not obeying the template:






And of course the idea that a rear spoiler causes flow reattachment is completely wrong for any car of about the last 30 years. The rear flow is already attached...

That's why this rear spoiler, that reaches no higher than the standard car profile, measurably increases pressures on the hatch:




Quote:
Originally Posted by aerohead View Post
I've gone through 'template' comparisons of telephoto images and technical drawings, published over the decades in ROAD & TRACK.
Rather than looking at pictures in magazines, you would learn a very great deal more by testing some actual cars.
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- Dr Wolf-Heinrich Hucho, the founder of modern vehicle aerodynamics
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Old 09-11-2020, 08:23 PM   #3 (permalink)
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Old 09-11-2020, 08:32 PM   #4 (permalink)
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I don't like it when people spread misinformation. In more than 30 years of writing about car modification, I've seen too many people waste their time and hard-earned money following bad advice.

Following a template when modifying car aero is a classic example - the equivalent of saying that an AFR of 12.5:1 always gives best power.
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Modifying the Aerodynamics of Your Road Car

"Your book is unique! It was high time that someone covered vehicle aerodynamics through the practical eyes of someone like you."

- Dr Wolf-Heinrich Hucho, the founder of modern vehicle aerodynamics

Last edited by JulianEdgar; 09-11-2020 at 10:19 PM..
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Old 09-12-2020, 12:40 PM   #5 (permalink)
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Julian, you've already said this all before. Jamming a new thread with repeats of the same images you have posted repeatedly before is simply bullying.
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Old 09-12-2020, 03:34 PM   #6 (permalink)
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Quote:
Originally Posted by California98Civic View Post
Julian, you've already said this all before. Jamming a new thread with repeats of the same images you have posted repeatedly before is simply bullying.
To be fair, aerohead also repeatedly posts lists of cars like this; this is the second such thread in just a few weeks. If you're going to criticize someone for saying the same thing again and again, give credit where credit is due.
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Old 09-12-2020, 04:12 PM   #7 (permalink)
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We all have more in common than we realize. But viva la dif-France.
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Old 09-12-2020, 04:43 PM   #8 (permalink)
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Quote:
Originally Posted by California98Civic View Post
Julian, you've already said this all before. Jamming a new thread with repeats of the same images you have posted repeatedly before is simply bullying.
Aerohead continually posts information on car aerodynamics that is incorrect and misleading. While I can be bothered, and to prevent others being mislead, I will continue posting information that shows how his posts are incorrect.

If that concerns you, I suggest you take it up with Aerohead - he is the person continually posting material that is incorrect and misleading. Or are you happy to see falsehoods being disseminated?
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Old 09-12-2020, 04:59 PM   #9 (permalink)
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Quote:
If that concerns you, I suggest you take it up with Aerohead .... Or are you happy to see falsehoods being disseminated?
As California98Civic and Vman455 (and that yahoo at Permalink #3) suggest disagreement is tolerable but excessive verbosity is not. And excessive capitalization of handles.

Quote:
Brevity is the soul of wit
William Shakespeare
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Old 09-12-2020, 05:09 PM   #10 (permalink)
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Quote:
Originally Posted by freebeard View Post
As California98Civic and Vman455 (and that yahoo at Permalink #3) suggest disagreement is tolerable but excessive verbosity is not. And excessive capitalization of handles.
Again, take that up with Aerohead not me. In fact my post used the premise 'a pic is worth a 1000 words' and had very few words (115 in fact) in it. It's Aerohead who writes reams of stuff - one reason I think he has got away with spreading rubbish here for so long... it just overwhelms people.

And as I said to California98Civic: are you happy to see falsehoods being disseminated?

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Modifying the Aerodynamics of Your Road Car

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- Dr Wolf-Heinrich Hucho, the founder of modern vehicle aerodynamics
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