Allard J2X...9778lbs of downforce?!

NewyorkKopter · 06-14-2007, 08:12 AM

Okay so I was on mulsannescorner.com, looking through the aerodynamic data base and I ran into this...
http://www.mulsannescorner.com/aerod...allardj2x.html

Its a car called the Allard J2X that supposedly makes 9778 lbs of downforce! wtf is that even possible?
Anyway I tried searching it google, but didn't find anything. Does anybody have any more info/pics on this car?(besides the stuff on mulsannescorner, like "the Allard J2X story")

beef_bourito · 06-14-2007, 06:05 PM

a formula 1 makes about that, i can't remember if they said 8,000lbs or 18,000lbs with the rear wing. they can theoretically drive upside down at 20mph.

2.2 Straight six · 06-14-2007, 06:23 PM

Quote:

Originally Posted by beef_bourito

a formula 1 makes about that, i can't remember if they said 8,000lbs or 18,000lbs with the rear wing. they can theoretically drive upside down at 20mph.

at 20? no.

beef_bourito · 06-14-2007, 07:00 PM

while i was watching the canadian grand prix they said that they generate enough downforce at 20mph to drive upside down.

GreyGoose006 · 06-14-2007, 09:42 PM

120 mph maybe

the saleen s7 can drive upside down at 140 mph

beef_bourito · 06-15-2007, 05:57 AM

yeah, just looked it up, it's around 120.

NewyorkKopter · 06-15-2007, 06:21 AM

18,000lbs!!!

...I guess that would exaplain the 4G turning forces. Oh, yea I was gonna say like 20 mph, that seems alittle too much lol. So did anyone find any other info on the Allard?

GreyGoose006 · 06-16-2007, 05:32 PM

no, but 4g isnt that hard with lots of downforce.
i think f1 can get near that, and still be able to drive over 200
those are some light weight and powerful cars.
i do know that if an f1 car driver lets off the gas, there is a 1g decelerative force from the downforce alone at around 150 mph.
add to that, the constant 2g of braking force and you have some seriously speedy braking.

beef_bourito · 06-16-2007, 05:35 PM

they usually experience 4g's of deceleration under braking, but it can be as high as 5 or 6g's.

2.2 Straight six · 06-16-2007, 06:30 PM

in the 80s i believe some ran as much as 8g in cornering.

drivers often gave in the call of nature from the forces.

NewyorkKopter · 06-26-2007, 06:18 PM

8GS! omg, wow. I was reading that at a certain point the driver would have to wear a pressure suit just to drive the car safely (like the blood would rush out of his head if he didn't). Is 8G anywhere near that point?

Quote:

Originally Posted by 2.2 Straight six

drivers often gave in the call of nature from the forces.

sorry, but what exactly does that mean?

Moppie · 06-27-2007, 12:41 AM

Quote:

Originally Posted by NewyorkKopter

Is 8G anywhere near that point?

Yes.

9g for 1 second is the about the practical limit of the human body before you start to pass out. Of course personal fitness and health has a huge bearing on that, people have been know to pass out from as little as 5g.

2.2 Straight six · 06-27-2007, 09:56 AM

Quote:

Originally Posted by NewyorkKopter

8GS! omg, wow. I was reading that at a certain point the driver would have to wear a pressure suit just to drive the car safely (like the blood would rush out of his head if he didn't). Is 8G anywhere near that point?

i don't think so, but i'm not completely sure. it might not be 8g, but if i remember it's something between 6-8. this was in cars like the Fan car and the old Lotus, they made insane amounts of power and downforce. power like ~1,400bhp in the Brabham BT52. Although, it's not actually known what the peak power was, as BMW's dyno only went up to 1,400bhp and the engine was still making power above that.

Quote:

Originally Posted by NewyorkKopter

Sorry, but what exactly does that mean?

It means they piss themselves.

NewyorkKopter · 07-03-2007, 04:38 PM

ooo hahhhh, lol. WOW the fan car made that much downforce??? I opened up a thread to discuss the fan cars and how they work (like the brahman BT46 car and the chaparrall 2J) but it got closed because it was supposedly "dicussed already". Thats nuts though; btw just out of curiosity...why doesn't any one make a fan car again today? Is it because its not worth it, or because its been banned or is it something else?

2.2 Straight six · 07-03-2007, 05:02 PM

it's banned. lots of Gordon Murray's designs were. they were so good but they got banned.

the reason it got banned (on paper) wasn't to even the competition, it was because everything the fan sucked up was shot out the back, so if you were behind you ran the risk of getting hit by stones and any other crap that was sucked up.

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