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Bahrain 2019 was the primary Grand Prix wherein Leclerc might battle for victory till the engine drawback compelled him to lose positions. However when precisely did this failure happen? And what have been the results for the efficiency of his SF90?
To seek out out, I in contrast the second half (with out DRS, to make the laps comparable) of the lap when the issue occurred, the earlier lap (for reference) and the subsequent. We see that on lap 45, on the yellow line, the engine out of the blue stops pushing: the velocity line stops rising as quickly as Leclerc enters the nook, with the automobile now not in a position to overcome the friction brought on by the nook, not like on the earlier lap. On this part, LEC radioed the issue (the engine was working on 5 cylinders as a substitute of 6).
The issue is repeated on the subsequent straight, with the white nook coming away from the purple one from 200km/h onwards (the place the engine now not limits the ability discharged to the bottom). As velocity will increase, the purple and white traces diverge, with the engine now not in a position to overcome the rising aerodynamic resistance.
However the issue solely intensified on the subsequent lap: the endothermic engine, having misplaced quite a lot of energy, couldn’t recharge the batteries sufficiently (the low exhaust gasoline temperatures fed the MGU-H much less, and the decrease velocity at first of braking recharged the MGU-Okay much less). In consequence, firstly of the subsequent lap, LEC additionally had a flat battery, dropping the contribution of the electrical motor as properly.
However how a lot is that this lack of energy? The ability required to achieve a sure velocity will increase with velocity cubed. LEC misplaced 5.4% velocity on lap 45 and 9.1% on lap 46. Subsequently, the ability loss is 15.3% on lap 45 and 24.8% on the subsequent lap. Assuming an influence output on the finish of the straight of just below 1000hp, this leads to a lack of 150hp and 245hp, respectively! This end result is smart: the interior combustion engine’s energy alone is round 800hp, so dropping one cylinder means dropping about 1/6 of the ability, i.e. 133hp. However the engine begins to work out of specification, so the precise loss is increased. On the subsequent lap, one other 95bhp is misplaced: the utmost energy of the electrical motor is 162bhp in accordance with the laws, however solely a part of that’s used on the finish of the straight. So when you went from 95hp to 0hp of electrical energy on the finish of the straight, the concerns can be legitimate!
Lastly, observe the throttle sign: as LEC loses energy, he can improve the share of throttle opening with which it negotiates the quick bend. He also can afford to brake later and open the throttle earlier.
I hope you loved the evaluation! Yow will discover me on Twitter (https://twitter.com/F1DataAnalysis) and Instagram (https://www.instagram.com/f1dataanalysis/) for additional analyses! I’ll attempt to reply all of your feedback and questions 😉
(Graphs generated by means of f1-tempo.com)
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