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leeks - 3/5/2020 10:56:11 AM

You won't find any data on the time attack cars as most of them are privately built. The top cars hire an aero engineer to design and cfd/wind tunnel test, which usually done so under a hefty NDA.

However you can compare laptimes at the track World Time Attack is held at each year (Sydney Motorsport Park in Australia)

Outright  Nico Hulkenberg (GER)    A1 Lola Zytek    1.19.142
Group 2A    James Winslow    Radical SR8    1.25.7027    

Time Attack Pro Class
1       Barton Mawer     Porsche 968     1:19.2770
2       Andre Heimgartner     Nissan Silvia S13     1:21.8760
3       Garth Walden    Mitsubishi Evo     1:23.8560

You are correct in thinking these cars weigh more than a F1 or Radical. They also run on lower grip tyre, rather than a slick they use a road legal semi slick.
Just going off those two facts and comparing the lap times I would assume the aero loads on Time Attack are no joke.

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Para - 3/5/2020 6:17:54 PM

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leeks - 3/5/2020 10:56:11 AM

You won't find any data on the time attack cars as most of them are privately built. The top cars hire an aero engineer to design and cfd/wind tunnel test, which usually done so under a hefty NDA.

However you can compare laptimes at the track World Time Attack is held at each year (Sydney Motorsport Park in Australia)

Outright  Nico Hulkenberg (GER)    A1 Lola Zytek    1.19.142
Group 2A    James Winslow    Radical SR8    1.25.7027    

Time Attack Pro Class
1       Barton Mawer     Porsche 968     1:19.2770
2       Andre Heimgartner     Nissan Silvia S13     1:21.8760
3       Garth Walden    Mitsubishi Evo     1:23.8560

You are correct in thinking these cars weigh more than a F1 or Radical. They also run on lower grip tyre, rather than a slick they use a road legal semi slick.
Just going off those two facts and comparing the lap times I would assume the aero loads on Time Attack are no joke.

Regarding the time posted, I’m not familiar with the Australian circuit....but obviously mind blowingly  quick when referenced to an SR8....although I’m just curious if the Time Attack cars are still incapable of pulling high g’s like the SR8....but they make up the time (lost on cornering) on long straights or gentler bends (as downforce is proportional to velocity squared) by making full use of that collosal power.....so that the cornering capabilities of SR8s is swamped in the overall lap times

Indeed, it would be good to have a peek inside and find out what sort of lateral loads these things are capable of.
Thanks a lot for a great input...much appreciated

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Hanaldo - 3/5/2020 11:17:40 PM

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Para - 3/5/2020 6:17:54 PM

+x

 

leeks - 3/5/2020 10:56:11 AM

You won't find any data on the time attack cars as most of them are privately built. The top cars hire an aero engineer to design and cfd/wind tunnel test, which usually done so under a hefty NDA.

However you can compare laptimes at the track World Time Attack is held at each year (Sydney Motorsport Park in Australia)

Outright  Nico Hulkenberg (GER)    A1 Lola Zytek    1.19.142
Group 2A    James Winslow    Radical SR8    1.25.7027    

Time Attack Pro Class
1       Barton Mawer     Porsche 968     1:19.2770
2       Andre Heimgartner     Nissan Silvia S13     1:21.8760
3       Garth Walden    Mitsubishi Evo     1:23.8560

You are correct in thinking these cars weigh more than a F1 or Radical. They also run on lower grip tyre, rather than a slick they use a road legal semi slick.
Just going off those two facts and comparing the lap times I would assume the aero loads on Time Attack are no joke.

Regarding the time posted, I’m not familiar with the Australian circuit....but obviously mind blowingly  quick when referenced to an SR8....although I’m just curious if the Time Attack cars are still incapable of pulling high g’s like the SR8....but they make up the time (lost on cornering) on long straights or gentler bends (as downforce is proportional to velocity squared) by making full use of that collosal power.....so that the cornering capabilities of SR8s is swamped in the overall lap times

Indeed, it would be good to have a peek inside and find out what sort of lateral loads these things are capable of.
Thanks a lot for a great input...much appreciated

They wont be anywhere near an F1 cars lateral acceleration, but they will be surpassing an SR8 Radical by quite a bit assuming Googles data on the SR8 is correct.

A quick search tells me an SR8 is capable of 2.5 lateral G's. Open class cars in Time Attack are running up around 3 lateral G's, so already more than the SR8. The Pro and Pro Am cars will be significantly more, though I cant find any posted data on that and havent heard back from my mate at Tilton. But I'm sure they will be up around 4-5 lateral G's. 

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Hanaldo - 3/6/2020 3:00:49 PM

I believe modern F1 cars are up around 8 lat G's through the high speed corners. 

But that said, I cant think of many corners in the F1 schedule that are taken at over 300km/h, which the top Time Attack cars are doing. So they could actually be in close territory.

Keep in mind that those classes have very little in common with a passenger car other than their exterior body shape, so it isnt totally surprising. Open class is really your more standard high aero passenger race car, and they will be managing around 3G's lat.