basti313 wrote:iHpled wrote:Rhodium wrote:the question is: why ?
save fuel ?
save engine ?
Power above the 12k rpm is less efficient on fuel, so better to shift earlier.
When my knowledge about the rules is reight, than the 100kg/h fuel limit does not count below 10500rpm. So I suppose they may run below 10.5k rpm with even more than 100kg/h and maximum boost (MGU H support?) when they need battery for K support to get out of corners. This may have slight power and drivability advantage.
On the straight they stay above 10k rpm and use the MGU-H to boost MGU-K. Between 10.5 and 15k rpm there is always the same amount of fuel to burn, so also alway the same engine power and MGU-H support...so they stay as low as gearing allows them to be and avoid higher rpm just because of engine life and efficiency.
Nope, not true:
5.1.4 Fuel mass flow must not exceed 100kg/h.
5.1.5 Below 10500rpm the fuel mass flow must not exceed Q (kg/h) = 0.009 N(rpm)+ 5.5.
The fuel flow is limited through the entire rpm range, up to the maximum 15k. It is a straight ramp up to 10500, then is flat.
The reason for the limited rpms is the specific fuel comsumption of the engine, which basically states where the engine is most efficient. The engines should have a wide power band, but at the same time a maximum specific fuel consumption close to the 10500 limit, to minimalize fuel consumption at maximal power. Normally you'll see these charts against the cylinder pressure, which can be converted to power. The chart for a Formula 1 engine is much different, basically mirrored, and with a slightly differnt scale (due to the 15000 rpms).

“Strange women lying in ponds distributing swords is no basis for a system of government. Supreme executive power derives from a mandate from the masses, not from some farcical aquatic ceremony!” Monty Python and the Holy Grail