Fulcrum wrote: ↑25 Sep 2021, 09:05
godlameroso wrote: ↑24 Sep 2021, 23:01
Fulcrum wrote: ↑24 Sep 2021, 18:34
I can think of 3 reasons for doing more than 2 stops: desperation, trying to steal the fastest lap, or getting a 'free stop' during a Safety Car period. You'd likely require a combination of these factors to facilitate 3 stops.
This track has a pitlane speed limit of 60kph. Between that and the low degradation tarmac, pit stops are hugely disincentivized, as evidenced by every race ever held here.
Look at the data from Practice 1, where the tyres typically degrade at their worst.
Bottas (C3) - 9 lap stint
01:41.762
01:40.801
01:41.978
01:40.761
01:40.675
01:41.172
01:40.232
01:40.615
01:40.516
Average: 01:40.946; 01:40.682 if excluding the initial high 01:41's.
I.e. Degradation lower than the fuel burn-off effect.
The Mercs are going to be under little to no threat with Max at the back of the field. They'll try to get through to Q3 on the C4 (yellow), nurse those tyres for as long as required during the race, before pitting for C3 (white). Then, come race end, they'll bolt on some C5's for the fastest lap. A 'fake' 2-stop in other words.
All of this assuming a dry race without Safety Cars.
That's 9 laps...The race is around 6 times longer than that, the tires are going to fall off a cliff and be horrendous to drive on in ~20 laps, there will be almost no grip in the rear, maybe you can nurse them for a one stop, but you'll be so painfully slow that it's not worth it.
So an, as yet, unobserved, yet humongous drop off in tyre performance. Okay then.
I'll stick with my prediction of a '1-stop' for Mercedes, with an unneccesary 2nd stop for fastest lap at the end of the race.
The drop off means if the opening stint starts in mid 40's on C2, then by lap 15 only mid 41's will be possible because you won't be able to put down the power in sector 3, by lap 20 you'll be doing 42's and you still have 32 laps to go. If you box on lap 14 you'll be doing mid 39's to high 38's because of fuel burnoff, and fresh tires, that's like 2.5 seconds pace difference per lap. Enough to overtake cars on older tires. Say I severely miscalculated, the hards are still not going to be able to do 30 laps for the same aforementioned reason. The pace drop off and the power of the undercut is too strong.
A 2.5 second per lap pace disparity means it takes ~10 laps to make up a pitstop loss. If your final stint is 14 laps, that gives you enough time to catch up, and gives you ~3 laps to get the overtake done.