iotar__ wrote:removed quote context is obvious
timorous wrote:In this particular race the Prime and the Option had practically the same degradation profile. They both lasted about the same but the Prime was just slower. Hamilton had already done 31 laps on the Option so doing 30 when the car is lighter, the track is more rubbered in and running in more clean air was easily doable.
The reason they should have switched strategy was because Hamilton got the overtake done on JEV and then put in 4 great laps that were a match for Ricciardo who had 15 lap newer tyres. That gave him the pit stop window over Rosberg and he had earned that entirely on his own merit.
Deg/speed profile of mediums and softs? Similar but certainly not identical and:
- Not in the race based on real life current conditions comparison Rosberg - Hamilton (you can adjust for drivers)
- Maybe not on 31 lap stint based on Alonso, OK, Merc was different I can see you can compare to middle stint but also you can compare to last stint on mediums (real life)
- 4 great laps? Maybe 4 unnecessary great laps that affected his tyres later? How can you be sure that 4 laps like that with softs and it's even worse than it was with mediums, small differences /= no differences, even if you adjust pace of course
- last 10 laps Hamilton was at slower Alonso's pace anyway (slower tyres didn't matter?), better car, better engine and DRS I didn't see him overtaking with better degradation towards the end (where tyre difference should be the highest?), on the contrary he was sliding and lost place to Ricciardo despite DRS from Alonso, now replace mediums with softs and what, everything is different and perfect? He is behind him earlier and faster, maybe a bigger chance.
- Rosberg is leading, deserved better strategy and they are fixed at Merc and are meant to separate them, like in Barcelona or Bahrain, you can't act like it's everything can happen scenario.
- Vergne was pitting anyway (his tyres gone), I don't understand what overtaking him has got to do with anything, what free air? Couple more laps on softs with pace longevity trade-off and shorter last stint? OK but nothing to do with Rosberg later
Lets look at the data Mercedes had available to them on Lap 39 when Hamilton came in for a pit stop.
1) He had completed 31 Laps on the Option tyre, in that stint 8.5 laps were at safety car speed, all but 4 of those laps he was in the dirty air of the driver infront, he made several overtaking moves, the car was obviously heavier in that stint and the track was greener. He was also able to pass JEV with relative ease, something Rosberg was unable to do and on laps 35,36,37,38 was able to match the lap times of Ricciardo who had tyres that were 15 laps newer than Hamilton's.
2) Williams had put both Bottas and Massa on the Prime tyre and they were very slow, suggesting that the lower track temp was not aiding in getting the Prime to work.
3) The data in FP1, FP2 and FP3 showed that the Prime tyre had a very similar degradation profile to the Option but was 1.5s/lap slower, a pit stop costs 20 seconds so in just over 13 laps the soft tyre would put you a pit stop ahead. 20 lap stints were comfortably doable on the soft tyre so even if the 30 lap stint looked a bit of a gamble at the time doing 2x 15 lap stints would have been faster than running the prime for 30 laps.
Given the above 3 facts it is easy to see that the Option tyre was the one to go for, doing 2x 15 lap stints or 1x 30 lap stint would probably have been a joint driver/team decision based on how Hamilton felt the track was at the time and his ability to look after the tyres. 1x 30 lap stint would have been marginally quicker than 2x 15 lap stints provided he did not reach the cliff at the end of the race. I think he would have been fine as he had already done a long stint with a heavier car while stuck in traffic and had a lot of pace when he was in clear air. I said this during the race so its not like this is some strategy with hindsight, I knew at the time that the Prime was the wrong call.
The 4 laps I am talking about were at the end of his 1st stint on slicks. He would have been comfortably in the mid to low 1:27's on new Options and would very likely have maintained that pace until the end.
The last 10 laps Hamilton was defending from Ricciardo and then Rosberg, of course he was slower.
Rosberg was leading, he deserved the better strategy until Hamilton got a pit stop advantage over him by doing the business and overtaking JEV which is something Rosberg failed to do.
If Rosberg had overtaken JEV earlier he would have gaped the cars behind and would not have lost position to Hamilton, which would have won him the race. His failure to do that his is own doing so why penalise Hamilton for actually getting the job done in 1 lap and pulling a gap to Rosberg, He earned his position on merit.
Now I do not think Mercedes penalised Hamilton in any way, it was quite a chaotic race and they were focusing (rightly so) on Rosberg and maximising his strategy, however once Hamilton managed to get a pit stop over Rosberg they should have switched focus as it was then Hamilton who was in the better position to maximise the points of the team, unfortunately in the chaos they missed this opportunity and I think that is unacceptable for a top class F1 team.
On the bright side they have learned a valuable lesson about strategic flexibility and hopefully they can learn from this mistake and make improvements to their in race strategy process to avoid this kind of error in the future. In a closely contested WCC/WDC this kind of error could cost the team or a driver the title so it is in their best interests to get it sorted ASAP.