7 replies to this topic

[Toyfan]

HI!
Does anybody knows how many times rear wing downforce is bigger than front wing downforce?
Also what is the distance between front wing and front wheels,distance between front and rear wheels and distance betetween rear wheels and rear wing?
I know that question is stupid but if You don't won't to post data can you then post a link to data about this.



Thanks.

[Enkei]

It varies from car to car. Not all cars have the same wheelbase. Ofcourse there are rules for it, look at the FIA site, http://www.fia.com/r...ques-2003-a.pdf

[dosco]

Piola's book(s) indicate the downforce produced by the front wings at 30% and the rear wings at 30% also. The diffuser/undertray makes up the difference.

All "guesstimates," of course......;)

[Toyfan]

Are you sure that they have the same amount of downforce?
I belive not. But I may be wrong(as usualy )

[desmo]

According to Peter Wright, 25-30% of the downforce comes from the front wing, 30-35% from the rear wing, and the remainder from the undertray and diffuser. Very similar to Piola's figures. I suspect these figures are very close to the actual numbers.

[Toyfan]

But if they are about same wouldn't there be more force on front wheels becouse rear wing is almost directly above rear wheels and there is certain distance between front wing and front wheels?
Or it is to small diference to be important.
My bad English...

[Impspeed Gerry]

Why more rear downforce than front?

As a general rule, a twitchy rear-end, oversteery car is OK in slower corners. Therefore non-aeordynamic factors in a chassis tend to be set up to tend towards oversteer at lower speeds, where the effect of downforce is much reduced. This helps the driver fling the car around lower speed bends, eliminating dreaded low speed understeer, and easy to catch at lower speeds if overdone.

However, this inherent instability can be highly undesirable in faster corners (unless you're G Villeneuve, Peterson etc.), where a more neutral, slightly understeering car is often more much more stable and safe.

The important thing is that downforce squares with speed (as per drag). Downforce is therefore much more prevalent in fast corners, less so in slower corners. With more rear wing than front, higher cornering speeds give greater proportional rear downforce to front, leading to the change from an inherently oversteering car in slower bends to a more neutral/understeering in faster ones - for reasons described above.

Or something like that....

[Toyfan]

BUT except for setup reasons they must be different becouse force on front and rear tyre aren't proportional to downforce created by front-rear wing.