bill shoe wrote: ↑
Thu May 23, 2019 2:24 am
Drica wrote: ↑
Wed May 22, 2019 7:47 pm
There is this video on youtube which has the onboards from Barcelona T9 from every car. Kubica's approach to the turn was completely different to Russell's, to the extent that Kubica braked on entry, thus had some 20kph lower apex speed to Russell who had only lifted prior to the apex.
Here is the video https://www.youtube.com/watch?v=BZjTGSUWgtc
Great video, yes.
Kubica peaks at 256 kph on entry just before his early lift, and speed during corner falls to min of 235 kph.
Russell peaks at 260 kph on entry, breathes it later, and speed falls to min of 250 kph. He is much more planted and solid and committed all the way through. I've looked at it several times and I'm not clear if this difference is down to car or driver. But it's a large difference.
All the other cars have a few things in common. They enter slightly faster due to little or no lift, then they hold their corner speed dead-nuts steady, it's really not a transient longitudinal situation for them. They hit low 260's on entry and stay at or above 260 thru the rest of the corner. The really strong cars in Q3 are getting up to mid to high 260's and maintaining that.
Great demo of F1 differences at the limit of car and driver, and of course a demo of one team that's really struggling.
Interesting video. If you look at the speeds post-corner at a fixed reference point (white lines on the left), we find:
Kvyat: (video cut off early)
Leclerc (Q3): 296
It isn't clear if all the early times are the quickest laps or not? If so, quite a difference, but not all speeds are quite what we might think they would be.
Comparing T7 speeds at the same point in the curve between Russell and Kubica shows Robert 10kph down at the same point in T7 (at the marker I used as a reference, 151 vs 161). That compromises T8 - Robert is down and can't make it all back - at T8 exit there's 6kph in it. That in turn impacts on corner entry speeds - as above, Robert is slightly slower than George at T9 lift (the same 6kph).
Why does Robert brake in T9? Well, at turn-in he has his left wheels on the white line. But he's a fraction later to turn in than George (a couple of metres), so his LF wheel is actually just on the grass, and likely his LR was too. He brakes (I believe) to try to get the car to turn in better from that compromised position. The car slightly over-rotates (well, more likely the car doesn't wash out as he's lost speed) so his RF ends up on the inside curb, so he can't get the power down early either.
If you look at the side-by-side on-boards from Bahrain, you'll see that in quali Robert was ahead of George for the first few corners, then lost out through poor traction on one bend and was behind. Robert was faster than George in Bahrain sector 3 in quali, but not enough to make up a single corner's worth of poor traction.
I'd love to see more on-board footage. Where do people find these things?