Interesting Aerodynamic Cars (Mike Vetter's ETV, also Avion)

[freebeard]

Adrian Newey's Hypercar, the AM-RB001



Allegedly, it has more downforce than any other road-going car, with a smooth, ventless upper body and a stepped diffuser and other high jinks underneath.

Possibly not a lot of passenger leg-room.

[Frank Lee]

Wouldn't that go in the unaerodynamic car thread?

Downforce = drag

[kach22i]

Originally Posted by Frank Lee

Wouldn't that go in the unaerodynamic car thread?

Downforce = drag

I tried to find a CD of the car but failed.

I did find this however.

Aston Martin AM-RB 001 hypercar revealed - exclusive pictures | Autocar

The AM-RB 001 has a small, adjustable, two-plane rear spoiler. “The rear wing will be an active element, but it doesn’t actually do that much. All it is doing is controlling the air off the top surfaces of the car,” said Palmer. “With your rear aerofoil, you want to cut the laminar flow and then you want to cut it as fast as you can so you don’t create drag. So you want it as far back as you can get it on the car within the limit of the regulations.”

You can gleam an awareness of drag as an issue from this.

You can also imagine that a car with a energy recovery system is attending to whole system approach.

Typically super-cars have high Cd's because of the cooling system and wings for down force.

From the cabin rearwards, the car has “an F1 layout” for its cooling, engine and transmission systems.

This car has wings, but they are more for controlling flow than down force (they claim), and has radiators for cooling a big V12 but it's treated like an F1 (they claim).

If the claims hold true there is promise, but there is also room for skepticism.

[freebeard]

My impression is that massive add-ons increase drag but shaping the underbody is 'free' down-force. kach22i says there're radiators, but I don't see much intake opening and only one exhaust.

The unaerodynamic thread is for things like this:


http://justacarguy.blogspot.com/2016/10/i-think-they-designed-this-soapbaox.html

[kach22i]

Originally Posted by freebeard

kach22i says there're radiators, but I don't see much intake opening and only one exhaust.

Of course there are radiators, it's not an air-cooled car. I suspect this concept mule does not have them installed yet. You can see the openings on either side but they look open/empty right now (and cut-out right side).

2017 Aston Martin AM-RB 001 Release | Cars Release Prices



If you know the F1 cooling system it is self explanatory.

http://atspeedimages.com/search.php?...200&length=100


More images and explaination in link below, last few paragraphs very telling.

http://www.motortrend.com/cars/aston...t-look-review/

[freebeard]

You mean this?

“We’re really trying to think about it from first principals, particularly in terms of saying this is our vision of what this car should be. Something like a Porsche 911 is basically the triumph of evolution over a bad concept,” Newey says bluntly. “It’s a bad idea, and they’ve managed to make it half-decent by a whole bunch of engineering. The important thing is to get the concept right.”

The Motor Trend pictures on a white floor are helpful to explicate the underpinnings. It starts to look a lot like Colani's C-form...



...Just with the front wing and more elaborated fender forms.

It sounds like the NA V-12 is provisional. If they want to sell it in Germany after 2025, it will be all-electric.

[Frank Lee]

Originally Posted by freebeard

My impression is that massive add-ons increase drag but shaping the underbody is 'free' down-force.

Certainly there are higher and lower drag versions of ways to get downforce but in the end, downforce is downforce and the cost of downforce is drag.

Thought experiment: 0 downforce car vs max downforce car doing a coast-down test. 0 car wins because it isn't using force vectored down.

I was taught in flight school that lift = drag.

[freebeard]

Thought experiment: "Straightenin' the curves and flattenin' the hills" with zero downforce.

'Free'≠zero. Can we agree on that?

[Frank Lee]

I don't go fast enough to straighten anything with downforce.

Agree free doesn't = 0

[Magajgfha]

Originally Posted by kach22i

I tried to find a CD of the car but failed.

I did find this however.

Aston Martin AM-RB 001 hypercar revealed - exclusive pictures | Autocar

If laminar flow has higher drag than turbulent one, the body surely ain't slippery. And I guess that the body is one big draggy spoiler.
Reminds me of F1 F-ducts:
F Ducts: How do they work? | Formula One technology - Racecar Engineering

Originally Posted by Frank Lee

Wouldn't that go in the unaerodynamic car thread?
Downforce = drag

Aerodynamic != low drag.
Yes, a car that has high downforce and high drag, but good L/D is aerodynamic.