Quote:
Originally Posted by Blackdog_kt
Watch your language...
On the topic at hand, going fine pitch/high RPM while flying in low-density air decreases performance after a certain point. The air is "thin" so you need to coarsen the pitch (lower RPMs) to get a sufficient bite of air, otherwise the prop just spins around really fast without pushing the needed amount of airflow.
It's modeled the same way in 109s by the way (you get better performance if you drop your RPMs a bit at higher altitudes) and it's one of the first things i noticed and really liked in the sim.
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The engine cannot produce maximum power unless the supercharger is spinning at maximum speed to provide maximum boost. The effect of prop tip speed is practically unnoticable with BofB RAF fighters at RPMs of 3000 or less because the props were designed to provide full power at this RPM and were sized accordingly.