Want low drag? Don't follow a template.

[JulianEdgar]

Originally Posted by aerohead

Keep studying. You may eventually understand.

A great example of Aerohead's personal belittlement and complete disregarding of actual, measured, real-world data.

There have been numerous examples posted here of cars with attached flow that have a sharper downwards profile than the template. All are explained away or ignored by Aerohead.

It's just astonishing that he got away with spreading such misinformation for so long here.

[aerohead]

Originally Posted by JulianEdgar

Yeah, well it was Dr Hucho himself who suggested I buy the fifth edition - that's the book with just two pages out of 1300 on 'ideal shapes'!

You haven't said a thing! Did you read the two pages? Maybe just throw away the other 1298?
Next time you two visit, ask him about the XL1. And why VW chose that form.

[aerohead]

Originally Posted by JulianEdgar

A great example of Aerohead's personal belittlement and complete disregarding of actual, measured, real-world data.

There have been numerous examples posted here of cars with attached flow that have a sharper downwards profile than the template. All are explained away or ignored by Aerohead.

It's just astonishing that he got away with spreading such misinformation for so long here.

I experienced zero examples. Only self-delusion, from a phenomena explained scientifically, but summarily dismissed because it didn't fit the twisted worldview of Mr. Edgar and his 'wrapped flow.'

[freebeard]

Originally Posted by jUlIaNeDgAr

It's just astonishing that he got away with spreading such misinformation for so long here.

Sez someone who continues to disrespect aerohead's handle.

[aerohead]

Originally Posted by freebeard

Sez someone who continues to disrespect aerohead's handle.

Wait until you read his book and find that it agrees with everything I've said since Julian Edgar joined us. He behaves as if he doesn't understand the very material in his own book. Photographs included! No continuity. Completely reverses himself within a span of nineteen pages. He's got a real future in stand-up comedy.

[Cd]

I remember there was a long drawn out, confusing discussion here on how the EV-1 could have a .19 Cd, yet be so far off of the template.
Aerohead, I think you mentioned something about the tumblehome playing a large part in keeping flow attached once the rear glass goes out of the curve of the template.
Did I understand correctly ?

Gary Eaker is one of the people that worked at G.M. on the E.V.-1 aerodynamics.

I have suggested in the past that some of you here might could invite him to the forum as a guest.
No one seemed interested.
I would invite him here myself, but I'm a "no-body" .
Aerodynamics is just a hobby that fascinates me, and I can't even do basic math.

Rather than argue back and forth, how about let's invite some other experts to the forum.

I'd love to have a guest on the forum that could answer some of the questions here.

I have Gary's contact information if anyone is interested.

[JulianEdgar]

Originally Posted by Cd

I remember there was a long drawn out, confusing discussion here on how the EV-1 could have a .19 Cd, yet be so far off of the template.
Aerohead, I think you mentioned something about the tumblehome playing a large part in keeping flow attached once the rear glass goes out of the curve of the template.
Did I understand correctly ?

Gary Eaker is one of the people that worked at G.M. on the E.V.-1 aerodynamics.

I have suggested in the past that some of you here might could invite him to the forum as a guest.
No one seemed interested.
I would invite him here myself, but I'm a "no-body" .
Aerodynamics is just a hobby that fascinates me, and I can't even do basic math.

Rather than argue back and forth, how about let's invite some other experts to the forum.

I'd love to have a guest on the forum that could answer some of the questions here.

I have Gary's contact information if anyone is interested.

Sounds great!

[JulianEdgar]

Originally Posted by aerohead

Wait until you read his book and find that it agrees with everything I've said since Julian Edgar joined us. He behaves as if he doesn't understand the very material in his own book. Photographs included! No continuity. Completely reverses himself within a span of nineteen pages. He's got a real future in stand-up comedy.

Only Aerohead would think that he knows more about the content of a book than the person who wrote it.

Unbelievable...

But that's the very man who people have apparently believed here over all those years. It's a funny world.

[AeroMcAeroFace]

Originally Posted by aerohead

You haven't said a thing! Did you read the two pages? Maybe just throw away the other 1298?
Next time you two visit, ask him about the XL1. And why VW chose that form.

I must have done this wrong then. I have tried quite a few times though. I think template wisdom would suggest reaching up to the template to get lower drag.

They must have separated flow all the way down the back.

"Aerohead, I think you mentioned something about the tumblehome playing a large part in keeping flow attached once the rear glass goes out of the curve of the template." Flow is 3d, there are C-pillar vortices that can cause the flow to attach. However it is not always the result of C-pillar vortices, the EV1 had a lot of attached flow from the side of the car going over the back window. I would think that the XL1 is the same.

[Vman455]

Originally Posted by aerohead

Keep studying. You may eventually understand.

In the past six months, I've bought 5 books on aerodynamics and am in the middle of #4 right now. I've also bought my second manometer, made my own pressure sensing disks, replaced those with commercial pressure sensors, and have done more on-road testing and measuring than in my previous 8 years on this site. And, after two more classes next spring (another dynamics class and one on CAD), I'll have my (first) engineering degree (third overall).

You would do well to follow your own admonition. Meliora.