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Jared

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Discussion starter · #1 ·
So I'm reading an old Top Gear article on their website about their first test drive of the Ford GT (I finished all my work for today by 8:30am so I am attempting to read the Entire Internet) and they were talking about the top speed of the GT and this was part of the article:

The development team went to quite extreme lengths to ensure the GT wouldn't threaten to take off (Mercedes CLK GT1-style) as its top speed approached. "The car was styled entirely with visual appeal in mind, its aero performance was a big unknown," says Jamal. So the development team started off by placing a Sixties GT40 in the wind tunnel first. "It produced considerable lift, so we knew we'd have our work cut out with the GT," Jamal explains. They then consulted former GT40 racer and Le Mans winner Dan Gurney. "He said the GT40 had such a lift issue at high speed on the Mulsanne Straight that he could turn the steering wheel through a quarter turn of lock, without it making any difference to the direction the car was travelling."
can you imagine how freaky-deaky that must feel to be able to turn the wheel a quarter turn and you are going so fast that you are lifted enough off the ground that it wouldn't matter? I would probably pee my pants at that point. props to Dan Gurney
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Minimal contact patch at that speed and lift.
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Gurney did it all.
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Huge-ass sedans, won an F1 race in a car of his own design (Spa, 1967), endurance racing, had the team to beat in IMSA GTP; won absolutely anything and everything.
 
Discussion starter · #5 ·
what is more amazing is that they didn't do any wind tunnel testing on the new car until the design was already finalized. Seems like you'd want to do it the other way around.
yeah it was rather funny how they did it. here's the rest of that section of the article:

Ford's Special Vehicle Team then subjected the GT itself to a combination of wind-tunnel testing and CFT (or computational fluid dynamics) modelling. In the translation from concept car to this almost-ready-for-production prototype, it subtly sprouted a front splitter, a smoothed-off undertray, a rear diffuser and a tiny bootlid lip spoiler. "Although, obviously, we couldn't get away with adding a big wing on the back."

The unique Goodyear 'Eagle F1 Supercar' tyres were bench-tested to speeds equivalent to well beyond 200mph before test drivers could risk taking prototype GTs up to around 190mph at a pair of five-mile circuits in Michigan and Arizona.

"Because these were ovals rather than circular tracks like Nardo, we were finding that we were having to slow down to 185mph as each turn approached," says Jamal. "Isn't that a lovely sentence? 'I slowed to 185.' " With what's termed the 'validation work' now done, he says "that gave us the confidence to go to Nardo.

"We brought a lot of alternative splitters, diffusers and spoilers out with us, in case we needed to make changes," he continues. "In practise, we didn't need them."

In fact, it seems they over-achieved. A couple of days earlier, this very Ford GT cracked 190mph at Nardo. And it didn't stop until it hit... 212mph. Not just once, but on three occasions, driven by three separate drivers.

Now, due to some unfathomable bureaucratic decision, Ford has decided to down-play the GT's top speed, planning to publish it as a still-mighty 205mph - a figure high enough to make this the fastest Ford road car ever.
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I know what a wickerbill is on a ChampCar wing...

Never got the particulars on the Gurney flap, though.



On a side note, a friend JUST called me on his cellphone from the pits at the Canadian Gran Prix weekend; I answered my cellphone as Alonso (he says) was blasting down the front stretch for F1 practice in Canada...
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Pretty good reception; I got t3h go0s3bumPs...
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is he the guy that the "Gurney wing" or flap or whatever it was called was named after?
the "gurney bubble" yes. the little dimple in the roof of the GT40, because he was too tall to fit in the car (with helmet) otherwise.

i think they test fit it without helmet, then freaked out when he went to test drive the first prototypes? dunno. there's probably a speed channel or history channel special that covers this.
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Discussion starter · #8 ·
no it wasn't the bubble, I remember P-51 and others talking in the Road/Rally/Auto-X forum about a gurney wing, some type of spoiler.
 
Its called a Gurney flap. Its a 90* piece attached to the trailing edge of a wing. The turbulance created actually created more downforce. And, yes, its that Dan Gurney.
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http://www.allamericanracers.com/gurney_flap.html
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Also, he also apparently invented the tradition of spraying people with champagne.
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no it wasn't the bubble, I remember P-51 and others talking in the Road/Rally/Auto-X forum about a gurney wing, some type of spoiler.
ah, well the gurney bubble is real, and attributed to him, but we were talking about 2 different things. my bad. i didn't know about the flap thing.
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Well, on Cup cars, it's not a 90-degree-angle single piece, nor is it straight and flat.

The angle on a Cup car varies from track to track and is in the neighborhood of 50 degrees, is much taller, it is arced and placed on the rear of a large sedan.
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Well, on Cup cars, it's not a 90-degree-angle single piece, nor is it straight and flat.

The angle on a Cup car varies from track to track and is in the neighborhood of 50 degrees, is much taller, it is arced and placed on the rear of a large sedan.
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You're thinking of the spoiler. The spoiler has a Gurney flap on the end.
 
Going back to the Ford Gt....2 1/2 year ago I was at SEMA and had a talk with John Coletti (we had spent a week together in 1995 on the SVT Cobra) anyway I was complementing him on the undertray of the Ford Gt.(As it spun on a turntable)

HE took both hands, placed them on my shoulders (in a very parental type way) and said "Allan, we spent MUCH more time on the bottom of this car than on the top"

I miss that guy
 
I can believe it, once you hit the right speed, with the right low pressure zone, the cp of the wing changes dramatically!
The mush-stang is a brick and at the top end of the track it get a little light on its feet. It lets lots and lots of air underneath the car....
OH well
-bix
 
HE took both hands, placed them on my shoulders (in a very parental type way) and said "Allan, we spent MUCH more time on the bottom of this car than on the top"

I miss that guy
Great quote! It makes sense considering that most of the design on top of the car was pretty well perfected 40 years earlier.
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Did you know the GT has the same steering pieces as the focus???

Check out the steering cover, turnsignal switch, and wiper switch.....makes me wonder if the GT steering wheel will fit a focus?????

dave!!
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Did you know the GT has the same steering pieces as the focus???
So does the Saleen S7.
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The C5 Corvette Z06 used the same steering column controls as my '93 Geo Metro.
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