I think we've found a bug in the way FSX is interpreting the reduction gear ratio. Ive got nothing concrete to go on yet to support it beyond some very short experiments performed on one aircraft, but indications support that fsx is interpreting a single number entered as the prop rpm ratio to the engine and decimal numbers such as 1.2 as equations ( or in this example 1/2 ) for the prop rpm.
the difference between the two is that the single number becomes a multiplier for the engine rpm while the decimal number becomes a divisional equation for the rpm. either way, what is reported on the rpm gauge is in fact the engine rpm in relationship to the prop rpm. In other words, fsx is looking at the prop rpm and using the multiplier or divisor to determine the displayed engine rpm as opposed to the other way around for simply determining the prop rpm..
Confusing i know, but Tom and i have been beating our heads against a wall for weeks on some outputs surrounding the gear reduction ratio that simply dont make sense.. The real tell will be in if we can learn whether this is an acceleration bug or an fsx bug..
[EDIT]
Bug confirmed: Changing my gear reduction ratio to 3:1 immediately gives me an engine rpm of 5000 rpm..
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