Linking RPM to Throttle
Kweassa, you got me wondering, so I set it up like you said and checked out the 109. While the 109f4 is spot on (and I suspect the other 109s as well), other aircraft are not.
Here's what I found:
In MANY planes (dare I say "most"?) the first reduced setting (i.e. not wep, not full throttle, the one below that) is almost spot on, but the second reduced setting (the one below that, most often max cruise) is usually off by a few hundred RPM (my method was to set MAP and check RPM). In most, the max cruise setting was way off. I checked one ride (it was either the p47N or the 190a5) the max cruise setting should have been at 2250rpm, but it was at 1850. Big difference.
In some planes it just doesn't work, as in the a6m5 mil power is (fuzzy memory alert!) 2700rpm and 40MAP, and cruise was 2700rpm and 35MAP (so that wouldn't work properly if you linked them). The max cruise was somewhat close but not exact.
Bombers aren't exact either.
Thing is, however, that it's close on lots, so if you fudge it and get near the fuel saver settings the E6B suggests, you should still save a lot of gas over "FFT". I'm currently going to use it for a while and see how it affects my flying. So far I'm interested in what it can do for me.
So basically if you want to link your RPM to throttle know that you may be sacrificing some fuel economy and performance when you are not at full throttle.
SECONDARY NOTE: You MUST (repeat MUST) map RPM1 through RPM4 all to the throttle, go into settings on the stick and invert the axis on each RPM listed. Doing RPM1 works fine for fighters, but if you launch a 2 engine fighter/bomber or 4 engine bomber you're boned.
While ShiftE selects all engines for 1 throttle, it doesn't seem to like using 1 rpm for all engines.