Visual quiz
 

Post a rough drawing or side profile pic of a car that is your best estimate of the shape of a car having these upper surface pressures:

https://i.postimg.cc/Qx7xfVKZ/pressures.jpg

Note 1: Start of graph is front of car (ie left) and finish of graph is rear of car (ie right).

Note 2: Centreline measured pressures

This quiz is a bit harder!

https://www.carparts.com/blog/wp-con...odge-viper.jpg

JK

Interesting, but that rear spoiler doesn't seem to fit, does it?

Right, which is why I added JK.

Was the first thing I thought of when imagining a car with a hood line that dips down before hitting the windshield.

I have no idea what 'JK' means!

https://ecomodder.com/forum/attachme...1&d=1600933704

.

Pretty good. Maybe some work on the front end? (Front of car starts at extreme left of graph)

Just couldn't "see" what was there, and I was in a hurry before my guess might be tainted by other peoples guesses.

https://i.pinimg.com/originals/a7/80...afbcb0ba0b.png

I don't know; I'm trying to think of cars with long hoods and a sharp windshield-to-roof transition. It's the pressures at the front that have me stumped.

long
 

Really long!

Just Kidding.

I guess kids these days use emoticons.

upper pressure profile
 

Seems like an earlier pre-fascia car, with a jutting front bumper, nerf-bars, and very long bonnet, which narrows it down to something akin to an XKE Jaguar Coupe.

If I could post new pics I'd have better subjects.

Open top car?

Not a bad guess, but incorrect.

For people struggling with the front pressures, to my eyes the whole graph looks exaggerated vertically - that is, the pressure variations are all greater than I would have expected based on my own measurements on other cars.

So maybe when picturing the car, dial back the pressure variations (but not whether they're positive or negative) a bit.

Having said that, people are doing a pretty good job so far.

Oops, I just realized positive pressure was below the x-axis. My mind always defaults to a positive value being represented higher on the chart. My ability to visualize would be helped by flipping it.

Why can't you post pics? I use https://postimages.org/

And no, it's definitely not an open top car.

The better question is why I think I could do better.

Mostly it's a mental block. The last copy I bought, 2nd hand, of Photoshop doesn't work on my current system. I've tried Krita and some others but nothing clicks. My best bet is likely Greasepaint inside Blender, but that's where the mental block comes in. I've beat my head against the learning curve in 3D, so I'm leery of taking on the 2D side. Or the video compositing.

So Mercedes Benz SSK mit kompressor?

https://i.pinimg.com/originals/d8/bb...92c846a4b1.jpg
https://i.pinimg.com/originals/d8/bb...92c846a4b1.jpg

Are we at least on the right track with the sports cars?

Yes.

Which rules out a dedicated racecar?

No it's not a dedicated race car.

https://i.postimg.cc/tgFHPGQb/000122.jpg

Do you consider this a sports car? I feel like the front has to have a lip or lights or some type of disturbance in the stagnation zone.

No, the graph isn't of my car.

And the car in question doesn't have additional lights.

OK, time for clues.

They later fitted a rear spoiler to reduce the rear lift.

There - now everyone will get it, right?!

That makes me think of this one, but that doesn't look right to me:
https://ecomodder.com/forum/attachme...1&d=1601022943

now?
 

1st-gen Audi TT ?

Not the first generation Audi TT.

Another clue. The shape first came out in the mid-late 1970s.

https://www.lambocars.com/images/countach/lp4006.jpg

I'm just throwing spaghetti at the wall at this point.

Nope, there wouldn't be the major pressure rise ahead of the windscreen.

https://i.postimg.cc/7L0q96mW/Figure-7-26b.png

?

Nope, but you're getting warmer.

https://ecomodder.com/forum/member-f...684-dasher.jpg
Giorgetto Giugiaro's B2 Passat/2nd gen Audi 80?

Nope, but you're also fairly warm. Sports car, remember (previous response).

OK, another clue: it's German.

New guess then:
https://ecomodder.com/forum/attachme...1&d=1601107561


Also about the wing on the Countach: What I learned from Harry's garage was that the wing was deliberately angled to do absolutely nothing. Customers asked for it because it looked cool (It was in that Cannonball Run movie) but if it provided any down force, the front lift problem the car already had, turned into total disaster.

Extremely warm!

Four numbers away?

Yes! To win, you need to post a pic. (And you don't actually win anything)