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Old 04-22-2012, 08:03 PM   #1 (permalink)
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Care to guess CD factor?

I just wanted some opinions on what you think the CD drag factor would be on the Lola T70, and, or replicas. (just this coupe body)

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Old 04-22-2012, 08:26 PM   #2 (permalink)
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.5 due to downforce?
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Old 04-22-2012, 08:41 PM   #3 (permalink)
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That

or worse. The first Porsche 930 turbo Carrera (whale tail) generated around 750 lbs. of downforce at 120 mph. The above has much more front and rear down force square footage.
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Old 04-23-2012, 11:26 AM   #4 (permalink)
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the vast majority of drag is usually in the back of the car.

The back of that car is HORRIBLE for drag - they were after downforce for the back of teh car at any cost of drag as horsepower was basically unlimited in that era.

Most racing cars are REALLY after grip - and grip is FREE with downforce.

You need to look at bonneville cars for inspiration.
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Old 04-23-2012, 01:16 PM   #5 (permalink)
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Quote:
Originally Posted by GRU View Post
.5 due to downforce?
At least 0.5, probably a lot higher. But minimal frontal area.

You could put in a little diesel engine and a 50 MPG sticker on the back, and watch the car nuts go berserk.
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Old 04-23-2012, 06:28 PM   #6 (permalink)
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Lola

I would guess it at over 0.60.
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Old 04-23-2012, 06:48 PM   #7 (permalink)
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I see a lot of potential in that car though.
The rear swings up . Just remove it and build a fiberglass extension for it.
This would not only help aerodynamics, but rear visibility as well.
Stock, the visibility was horrendous .
A boattail just like the one on the Olds Aerotech would look right at home.
No odd stares either. Thumbs would go up.
I've always loved the look of the Lola.
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Old 04-23-2012, 06:53 PM   #8 (permalink)
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YKYAEM when you admire that car for its windshield instead of the engine.
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Old 04-23-2012, 07:04 PM   #9 (permalink)
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Gulf-Mirage 1967 To 1982 - Ed McDonough - Google Books

This source gives the car a Cd of .395
I seem to remember reading the current generation GT-40 was tweaked down to .36 if memory serves me right.
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Old 04-23-2012, 08:43 PM   #10 (permalink)
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The book Competition Car Aerodynamics puts full blown Formula 1 cars at between .7-1.1CD depending on what track they were set up for. The books forward was written by a Formula 1 aero engineer whos been working in F1 for 20 years.

I would guess .5, but i could believe it being what cd listed above.

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