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Old 12th February 2019, 14:00   #11
bl52krz
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Originally Posted by grout20 View Post
Woah ! Now that is gorgeous!

The coupe I saw today was a fairly dark green (not BRG) but not a colour I have seen before.

Drag coefficients are not at all important when it comes to E Types, really!


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Your photo reminded me of the time my then girl friend, now my wife, we’re going down to the smoke on the M1 in my 100e van, XOM 611. We were cruising along at a steady 60 mph, and suddenly a red E type shot past well over 100 mph, and another went past going around the same speed. My girl friend said ‘can we have one of them’? You can guess the answer.
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Old 12th February 2019, 14:22   #12
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From memory, the first cars to be marketed with drag coefficient info was the Ford Sierra and the Audi 100, both being classed as 'jelly mould' designs.

I'm not too sure what the figures were, but 0.33 seems to ring a bell
Pretty spot on. The last of the Cortinas were 0.44 and the Sierra was 0.34.



I had both as company cars and I remember that the Sierra didn't like crosswinds on the motorway.
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Old 12th February 2019, 17:18   #13
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I first read about drag coefficient in Autocar magazine in the 60s. It was included in the specs and data they gave in car reviews. You also got details like mph/1000 rpm in each gear, including reverse. As I recall, the maximum speed of an E-type in second gear was around 70mph.


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Old 12th February 2019, 19:27   #14
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I can clearly remember in the traffic light grand prixs that I never had to go above 2,000 rpm in any gear to make the cars around me become small dots in the rear view mirror.


This low drag thing. Volvo estate cars started to compete in the saloon car racing but I think they were banned because they had a great advantage due to the much smaller drag co-efficient. It was because their rear end was flat.--
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Old 12th February 2019, 20:11   #15
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Didn't the Audi have it etched on the rear windows somewhere?
Yes, I think there was a sticker placed somewhere on the glass....I wonder how many still exist ??

Does anyone else remember the Audi 'Procon 10' system ?? A very ingenious progressive deformation system that operated in a heavy front end crash, think it used steel cables around the engine to pull the steering column forward & away from the driver (....this is all from memory again though, so could be completely wrong and dreamt it...)
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Old 12th February 2019, 21:03   #16
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The 2019 Mecredes CLS has a drag coefficient value of 0.26. It's quite an achievement really.
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Old 12th February 2019, 21:22   #17
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Rover 75(Mk1) Drag Coefficient 0.29
Source: https://www.carfolio.com/specificati...car/?car=79717

With the engine under panel in place, bet it becomes much worse without it.


I thought I remembered the Saab 99 having a figure around 0.32?
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Old 13th February 2019, 08:05   #18
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Of course with too little drag what you've got is a wing, which isn't good news for sticking to the road.
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Old 13th February 2019, 09:09   #19
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Of course with too little drag what you've got is a wing, which isn't good news for sticking to the road.

Not at all. Drag works against forward movement and has no impact on upward/downward forces acting on the object.

The Mercedes CLS is a case in point - a super heavy car, with a large downward force when moving, but with a drag coefficient of only 0.26.
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Old 13th February 2019, 11:03   #20
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Thanks for all the comments and info on this.

Seems like the (pre-facelift) 75 at 0.29 is pretty aerodynamic in comparison to some. Well done RichardW !

I wonder if the change of styling for the facelift model made much difference?

Cheers all

John
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