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I used to professionally drive F3, and trust me than no car in the world will ever have the same downforce as an F3, let alone an F1 car.
5G under braking and around 4Gs in corner.
I would agree there is a speed differential but I don't think that video is accurate....either the F1 is sped up (my guess) or the GT cars are slowed.....it's obviously a heavily edited video.....
I would agree there is a speed differential but I don't think that video is accurate....either the F1 is sped up (my guess) or the GT cars are slowed.....it's obviously a heavily edited video.....
Also, the F1 cars aren't exactly following the track. Looks like the overlay may just be off.
I guess I wasn't saying the gt3rs was as fast or has the same aerodynamic downforce as an F1 car but the fundamentals of aerodynamics are the same at 20mph as 200mph. If there was no effect I don't think Porsche would use the rear wing or front louvres. Unfortunately I don't have any wind tunnel data to support my belief that dropping the front and raising the rear of the car has a measurable effect on downforce/reduced lift.
I'm sure a rear diffuser would help as it would work the same way (venturi) to decrease the pressure under the rear. I think the common slats are just to clean the air unless they widen out laterally as well.
I'm just trying to propose a reason for the apparent higher back end of the gt3rs.
I'm just trying to propose a reason for the apparent higher back end of the gt3rs.
It does indeed look high (even more so on the pics of Weber going round the ring). Certainly on the LO car can't help but think the black lower trim gives visual impact its higher - it wraps around more than on the GT3. Reckon if it was same colour it would not look so bad.
The aerodynamics on a F1 car is undoubtedly very complex. Generally speaking, I believe the bottom of an F1 car is level with the ground. The diffuser in the back of the car is what helps accelerate the air from the bottom to help with the downforce. The rake you mentioned may be due to heavy braking.
Don't think the RS has much in common with an F1 car with regards to the underbody aerodynamics.
The downforce is a function of the angle of the diffuser and height above the ground. Rake was actually set in the chassis during part of the RB7 heyday, but the regulations have changed now requiring the angle of the diffuser to be reduced if the height is increased.
There is no advantage to running rake now due to these regs.
The downforce is a function of the angle of the diffuser and height above the ground. Rake was actually set in the chassis during part of the RB7 heyday, but the regulations have changed now requiring the angle of the diffuser to be reduced if the height is increased.
There is no advantage to running rake now due to these regs.
NateOZ, you are correct! Found this article and it explains very well how the RB F1 cars ran higher rake angles and made it work better than the rivals.
Good article. I wasn't sure how they were using the exhaust. It would be much easier to run deep side panels on the exterior of the diffuser if the rules permitted.
I believe they are still running rake. It's not all about the diffuser. F1 is governed by a ton of rules. They could do so much more with these cars but I understand that budget and speed/safety are real concerns.
This photo shows the front under panel literally on the ground with the back way up. Is Porsche doing this on the RS?
Sorry if this has already been discussed but what does Lava Orange really look like? I've seen pics where it looks like pure bright orange whereas in other pics it looks like a pale or washed-out orange.
04-25-2015, 09:58 AM
