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Old 11th February 2019, 11:22   #1
grout20
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Default Drag coefficient...?

Hi all

The car has been sitting outside for a few weeks so was pleased to take it out for a drive in the sun this morning

I watched an absolutely beauuuuutiful E Type going the other way and the topic of Drag Coefficient entered the old brain. It used to be a frequent mention in car adverts of old, but never really thought about it for the 75.

A quick search of t'interweb tells you a lot about the theory, but on a few sites Rover/MG don't even get an entry in the lookup list. (Mercs apparently are very efficient.....)

Out of interest, anyone know how the 75 compared against its peer group cars of the late 90's / 00's ?

Anyone even interested..... ?!

The early design drawings of the 75, I think, look a bit sleeker than the final production .... come to think of it whilst typing this, those drawings look a bit modern Merc like....

Happy Roving, all

John
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Old 11th February 2019, 11:45   #2
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I believe Richard Woolley once said the production 75 was close to his original drawing ( not like poor Harris Mann who sketched the Allegro and it was produced as something else !) Regarding cd figures, I had a book on cars that stated that my mark 1 Capri was less efficient than my previous Austin A40 Farina !
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Old 11th February 2019, 16:21   #3
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Quote:
Originally Posted by grout20 View Post
Out of interest, anyone know how the 75 compared against its peer group cars of the late 90's / 00's ?
Rover 75(Mk1) Drag Coefficient 0.29
Source: https://www.carfolio.com/specificati...car/?car=79717

Jaguar E Type 0.4

Source: http://www.superstreetonline.com/fea...r-e-type-icon/


You'll have to look up other cars for comparison they're easy to find online.


TC

Last edited by T-Cut; 11th February 2019 at 17:01..
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Old 11th February 2019, 19:54   #4
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Quote:
Originally Posted by T-Cut View Post
Rover 75(Mk1) Drag Coefficient 0.29
Source: https://www.carfolio.com/specificati...car/?car=79717

Jaguar E Type 0.4

Source: http://www.superstreetonline.com/fea...r-e-type-icon/


You'll have to look up other cars for comparison they're easy to find online.


TC
So that's what slowed my E-Type down.---Well I never !!!
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Old 11th February 2019, 19:56   #5
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Quote:
Originally Posted by T-Cut View Post
Rover 75(Mk1) Drag Coefficient 0.29
Source: https://www.carfolio.com/specificati...car/?car=79717
Jaguar E Type 0.4
Source: http://www.superstreetonline.com/fea...r-e-type-icon/
You'll have to look up other cars for comparison they're easy to find online.
TC

Thanks TC ...... 0.29 sounds pretty efficient! ..... oh,and Happy Birthday!

Thanks Pete .... yes I remember Richard Woolley saying it remained true to his original design work.

Attached a few pics for interest, including my previous 75.

Cheers f'now

John
Attached Images
File Type: jpg Orig Design.jpg (46.7 KB, 36 views)
File Type: jpg Merc 2018.jpg (5.8 KB, 34 views)
File Type: jpg Merc 2018b.jpg (7.6 KB, 37 views)
File Type: jpg BD02 2017.jpg (136.8 KB, 31 views)
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Old 11th February 2019, 20:06   #6
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Quote:
Originally Posted by grout20 View Post
Thanks TC ...... 0.29 sounds pretty efficient! ..... oh,and Happy Birthday!

Thanks Pete .... yes I remember Richard Woolley saying it remained true to his original design work.

Attached a few pics for interest, including my previous 75.

Cheers f'now

John
Pics EH !!

Here's mine------
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Old 11th February 2019, 21:01   #7
grout20
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Originally Posted by COLVERT View Post
Pics EH !!

Here's mine------

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!


John
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My 2.5 V6 Connoisseur SE Auto 75 is the
• 20,516th 75 to be made out of 112,381
• 787th 2.5 V6 Connoisseur SE to be made out of 3,671
• 1,248th Wedgwood Blue Metallic (code: JBH) to be made out of 7,515 code JBH 75's
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Old 11th February 2019, 23:07   #8
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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
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Old 12th February 2019, 13:43   #9
Lord of Hog
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Originally Posted by Sonic ZS View Post
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
That's what I recall too. Didn't the Audi have it etched on the rear windows somewhere?
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Old 12th February 2019, 13:49   #10
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Originally Posted by COLVERT View Post
So that's what slowed my E-Type down.---Well I never !!!

By current standards, the e-Type is pretty poor. The windscreen angle is probably a big contributor to the poor figures, but there are many factors involved.


I was looking over a V12 recently and my overall impression meant there was no way I'd be in one at anywhere near 150mph.


TC

Last edited by T-Cut; 12th February 2019 at 13:53..
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