I'm glad Pat brought up the DS19, which I'm sure everyone agrees fits the definition of "active". That was fifty eight years ago, and totally without benefit of silicon engineering. My chapeau doffs to M. LeFebre yet again.
With respect to passive systems, the problem amounts to intelligent...
Okay, here are two more, but given the distortion in photo lenses, we can only guess at the hardpoints. This is the best I can come up with.
The LCA's, however, do seem to be canted out more.
Also check out #22 in the series.http://www.ultimatecarpage.com/pic/3129/Pagani-Zonda-R_24.html
Why, oh why, would anyone choose to add toe out to the outside rear wheel on bump?
Maybe there's a whole lot of designed-in understeer somewhere else, but I rather doubt it.
Oops! the jpg somehow didn't take. Here's the Pagani photo link. It's the tenth image: the ghosted overhead view.
Apologies to all.http://www.pagani.com/zonda/zonda_R/default.aspx
Forgive me for being a bit late, but there is an interesting variation on this theme: the rear arms on the Pagani Zonda R.(See attached)
It appears that both upper and lower arms are canted outward at the front: the top one at~10 deg or so, and the lower ones maybe a bit more. I would think...
Greg:
I was about to say the same thing... This approach, by the way, seems to be a natural for the "elevated ground plane" approach suggested by Katz. One might still need to fiddle with it to eliminate the remaining boundary layer effect, but it suggests that a few well placed pressure...
Thanks to all:
Pat-
The expected dimensions of the model are somewhere around 100cmL X 40cmW X 20cmH, and the shape fairly aerodynamic, so I wouldn't imagine that it would be worse than the stuff normally carried on roof racks.
Pneumatic instrumentation is fairly lightweight,(thanks Honeywell)...
Well, yeah...
But that becomes a big project in a hurry if you want decent Reynold's numbers. Not to mention that you have to characterize, rebuild, tweak, repeat...
I've included a link for a design that is at least 1/5 too small.
The cost scales something like the 3rd power of the linear...
I've not yet seen any reference to this, and it would seem so obvious that there must be something wrong with it.
However, it occurred to me that a 1/5 scale model affixed to a "ground plane" mounting on the roof of a passenger car tow vehicle, could achieve Reynold's numbers close to 1 X 10E6...
And our standard for beauty would be???*
Seriously, the body (fuselage?) shape is most interesting, and actually seems to be tetrahedral. Haven't seen that before. Anyhow they seem to have generated a CD of 0.16, Including those faired wheels. I'd be interested to see what the Frontal Area is...
Here are two references I came across. The first one is based on an ADAMS simulation and is pasted below:
http://www.mscsoftware.com/support/library/conf/adams/euro/1996/EURO9604.PDF
the second one is more "hands on" and provides some simple calculations which can also be applied to de Dions...
If I have this right, the FSAE shock is a collaboration between Ohlins and Cane Creek- maker of high-end bicycle shocks.
As small shocks go, it's fairly deluxe: twin tubes, external nitrogen reservoir, separate high and low speed adjustments for both bounce and rebound (four in all), but it's...
I've recently seen some photos of the unclothed MP4-12C chassis sporting what seems to be a version of the Tenneco/Kinetic "CES interconnected passive reactive system".
They (McLaren) are making a big deal about the absence of ARBs and continuously controlled damping. Sounds like something right...
You've hit the nail on the head. Any suspension is a set of trade-offs and compromises, and coupled systems are no exception.
The in/in (which I prefer to call common-mode) situation you describe produces the same two-wheel bump problem, whether it's connected side-to-side as in an ARB, or back...
The point I was driving at is, that full active systems may be wonderful, simple passive interconnection achieves much the same at a fraction of the cost. The mechanical 2CV and the hydragas/hydrolastic system proved that, and they were reliable over long prodution liftimes.
They were...
Thanks Peter:
My main point was not to advocate that everyone should start paying Moulton royalties; there are other approaches to coupled suspension: Creuat, and perhaps most majestically, the Citroen DS19. (No "Bouncy-Bouncy" there, although having my brief encounter the the MG1100, I quite...
After Greg Locock mentioned it, I decided to go dig up Alex Moulton's 1979 SAE paper on the Hydragas system. I was startled by the similarites to Creuat's paper of 23 years later (attached), even though the coupled hydropneumatic units are "wired" differently. (In the Creuat, the hydropneumatic...
