Quote:
Originally Posted by jf1981
Yes, to be considered.
If it's modelled right, mixtures pulled back is rich, then it shall be ok. And when pushing away, the engine's rough under many conditions.
I've also learned that it should'nt be the case since they are normally auto rich and auto lean so lean shall work better in theory.
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Actually, even with semi automatic mixture it's advised to use auto-rich whenever using high power settings. That depends on the aircraft and doesn't only mean WEP/boost cut out. It could also mean any boost above +5.
I don't know what the real aircraft used and how it's modeled in the sim, but from flying various A2A add-ons on a friends's FSX installation and after reading various manuals of real aircraft, it's pretty clear that high power needs rich mixture.
I think it's because it helps cool the engine and prevents detonation. I think detonation is improper fuel burning through pre-ingition, which damages the piston rods because they are out of alignment at the time of ignition, but i'm not entirely sure.
Generally speaking and as a safety measure, only use auto-lean for cruise. Cruise means the specified engine settings, not simply flying straight and level at whatever boost we want, it could be as low as +1 boost. Take-off, climb and combat should be done on rich, as well as fast cruise.
I don't know the limits for the Merlin (Spits and Hurris) but just as an example, let me give you the Mercury engine limits from the Blenheim pilot's handbook. The engine can do +5 at full throttle and +9 with the boost cut-out activated.
Nevertheless, anything above +1.5 requires auto-rich:
economy cruise is +1.5 at auto-lean
fast cruise is +3.5 at auto-rich.
In other words, just because there is spare power it doesn't mean it's sustainable at all times and conditions. That being said, i agree that some of the in-game limits are currently off the mark.