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Forum: Aerodynamics 07-26-2021, 08:05 PM
Replies: 104
Views: 8,475
Posted By JulianEdgar
No flat roads and no straight roads = near...

No flat roads and no straight roads = near impossible to test. I currently drive 30 miles to my test location.

Example of on-road accelerometer testing:
...
Forum: Aerodynamics 07-21-2021, 03:58 AM
Replies: 104
Views: 8,475
Posted By JulianEdgar
Thank you

I have been told that, if I am to continue posting here, I am not to address any posts that Aerohead makes. That is unacceptable to me, because unfortunately Aerohead is the greatest source of...
Forum: Aerodynamics 06-25-2021, 08:25 PM
Replies: 23
Views: 2,615
Posted By JulianEdgar
https://i.postimg.cc/q7wv1tGz/924-lift.png ...

https://i.postimg.cc/q7wv1tGz/924-lift.png

You can see why they needed to add the rear spoiler for the faster Turbo model.
Forum: Aerodynamics 06-25-2021, 06:37 PM
Replies: 636
Views: 442,524
Posted By JulianEdgar
Unfortunately, some of these rules are deceptive...

Unfortunately, some of these rules are deceptive or incorrect. Looking at any low drag current car quickly shows that.

For example, the 'body must be as rounded as possible' applies only in parts...
Forum: Aerodynamics 06-25-2021, 06:24 PM
Replies: 7
Views: 1,062
Posted By JulianEdgar
The Ahmed body was used in the mid 1980s as a...

The Ahmed body was used in the mid 1980s as a very simple shape to work out some relationships between airflow and drag. It is still used today when basic relationships need to be explored, eg in...
Forum: Aerodynamics 06-25-2021, 06:03 PM
Replies: 23
Views: 2,615
Posted By JulianEdgar
The above pic is also interesting because it...

The above pic is also interesting because it shows how smoke streamlines can be a bit deceptive. Here it could be thought that there is flow separation occurring over the rear hatch, but if that were...
Forum: Aerodynamics 06-25-2021, 05:55 PM
Replies: 636
Views: 442,524
Posted By JulianEdgar
Don't forget that if you extend the top edge of...

Don't forget that if you extend the top edge of the shape past the tailgate you can then add a spoiler without increasing wake area. That is then likely to reduce drag and lift.

Also, you don't...
Forum: Aerodynamics 06-25-2021, 05:13 PM
Replies: 7
Views: 1,062
Posted By JulianEdgar
The Ahmed body, and the lessons drawn from it,...

The Ahmed body, and the lessons drawn from it, are now little used in modern car aerodynamics.

In fact, testing of detailed car models in wind tunnels with a moving floor and wheels has shown...
Forum: Aerodynamics 06-25-2021, 03:00 AM
Replies: 33
Views: 2,637
Posted By JulianEdgar
Actually, it's very interesting. When you write a...

Actually, it's very interesting. When you write a book on a topic, and the book attempts to cover a broad area of that topic, it's a huge learning experience. That's because, if you are honest with...
Forum: Aerodynamics 06-25-2021, 02:31 AM
Replies: 33
Views: 2,637
Posted By JulianEdgar
In fact, California98Civic, I was thinking about...

In fact, California98Civic, I was thinking about you the other day.

There (what 5-6 months ago - more?) was Aerohead saying point-blank that fastbacks always had less lift than squarebacks.
...
Forum: Aerodynamics 06-25-2021, 02:03 AM
Replies: 33
Views: 2,637
Posted By JulianEdgar
As usual, you are misquoting the context of my...

As usual, you are misquoting the context of my reply. Maybe you didn't see it, so I will repeat what I was responding to.

"Julian has been a cancer to the site ever since he came on but he writes...
Forum: Aerodynamics 06-23-2021, 11:17 PM
Replies: 23
Views: 2,615
Posted By JulianEdgar
Very interesting ad for the 924: ...

Very interesting ad for the 924:

https://i.postimg.cc/FRXdF65j/streamline-madness-a-gallery-of-automotive-aerodynamics-in-print-ads-13.jpg
Forum: Aerodynamics 06-23-2021, 06:43 PM
Replies: 33
Views: 2,637
Posted By JulianEdgar
Vman 455 was appointed a moderator many months...

Vman 455 was appointed a moderator many months ago.

The title of this thread is enough to categorise it as more personal abuse from Aerohead.
Forum: Aerodynamics 06-23-2021, 06:28 PM
Replies: 636
Views: 442,524
Posted By JulianEdgar
Yes - I suggest that you just do mock-ups to test...

Yes - I suggest that you just do mock-ups to test first, without worrying too much about 'getting things right' (eg the underlying framework) for the final one.

If you expect to have to try 4-5...
Forum: Aerodynamics 06-23-2021, 04:55 PM
Replies: 636
Views: 442,524
Posted By JulianEdgar
Stiffness depends on the grade of plywood, so...

Stiffness depends on the grade of plywood, so best to go handle a few sheets. Around here at least, 6mm (1/4 inch) ply may well be too stiff if you want to try to bend it at all three-dimensionally.
Forum: Aerodynamics 06-23-2021, 04:39 PM
Replies: 22
Views: 2,285
Posted By JulianEdgar
In that case you're confused, I think. ...

In that case you're confused, I think.

Hucho's reference to bistable flow (in your words - 28-degree-to 32-degree range, where the separation line jumps between a fastback and squareback wake...
Forum: Aerodynamics 06-23-2021, 04:34 PM
Replies: 33
Views: 2,637
Posted By JulianEdgar
It's not hard to understand. Threads have...

It's not hard to understand.

Threads have been closed where either/or:

1) You have been being personally abusive.

2) You have been posting topics that are quite irrelevant to aerodynamic...
Forum: Aerodynamics 06-23-2021, 04:21 PM
Replies: 23
Views: 2,615
Posted By JulianEdgar
Most people understand what a smaller car is. I...

Most people understand what a smaller car is. I don't know of any smaller production car that looks exactly like a big one but is just shrunk proportionally in all directions.
Forum: Aerodynamics 06-23-2021, 04:16 PM
Replies: 31
Views: 4,438
Posted By JulianEdgar
Not sure quite what you are asking. If you...

Not sure quite what you are asking.

If you want to learn about car aerodynamic modification, read my book 'Modifying the Aerodynamics of Your Road Car'. It's the only book available on the topic....
Forum: Aerodynamics 06-23-2021, 04:10 PM
Replies: 22
Views: 2,285
Posted By JulianEdgar
The rear hatch angle is nowhere in the range you...

The rear hatch angle is nowhere in the range you have described.

https://i.postimg.cc/HWvQsDbD/rt-i-holden-astra-AH-cdti-m-silver-s-r-00-65.jpg
Forum: Aerodynamics 06-22-2021, 07:04 PM
Replies: 23
Views: 2,615
Posted By JulianEdgar
Yes, they were testing full scale with the cars...

Yes, they were testing full scale with the cars made from polystyrene and having interchangeable bits.
Forum: Aerodynamics 06-22-2021, 05:24 PM
Replies: 23
Views: 2,615
Posted By JulianEdgar
Uno - Cd versus downward slope angle of the roof....

Uno - Cd versus downward slope angle of the roof.

https://i.postimg.cc/cHYyM1C8/Uno-roof-angle.png
Forum: Aerodynamics 06-22-2021, 03:53 AM
Replies: 23
Views: 2,615
Posted By JulianEdgar
Another one from the Uno - front spoiler depth....

Another one from the Uno - front spoiler depth. (No smooth underfloor in a car of this age.)

https://i.postimg.cc/2ygXzTMZ/Uno-front-spoiler.png
Forum: Aerodynamics 06-21-2021, 10:09 PM
Replies: 23
Views: 2,615
Posted By JulianEdgar
Compared to the standard car, the Turbo had the...

Compared to the standard car, the Turbo had the following changes:

- Rear spoiler
- Different front bumper
- Flush glass on front doors
- Improved under-hood airflow
- Modified rocker panels
Forum: Aerodynamics 06-21-2021, 05:50 PM
Replies: 636
Views: 442,524
Posted By JulianEdgar
Yes, typically if you reduce the base area - area...

Yes, typically if you reduce the base area - area in contact with the wake - you will reduce drag.
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