A chronic "stock" Flight Model glitch which appears seemingly proper

[alfa2]

I'm very late in discovering this chronic glitch, however i think anybody should be aware of it.

In the [FlightControl] section of any jet  fighter with an afterburner there is an entry stating "MachLimitDry=XX" where "XX" is a value usually less than unity. It's purpose is obvious, to limit AB equipped AI jets, or actually any AI jet to break the sound barrier with its "dry"  non augmented thrust. As happens usually this [FlightControl] setting also affects the player controlled planes, regardless of their drag & thrust modelling fidelity. However, this setting is seemingly proper but in fact it is a nuisance, since it introduces a significant FM glitch. It results to  zero engine dry thrust above the "XX" value limit, while in the cockpit you can't observe it since all indications remain proper (rpm's, fuel flow, EGT's etc). It is only the dry thrust being suppressed which in fact is a big mistake. The turbojet and turbofan jet engines always produce a core "dry" thrust by the hot exhaust stream of the core combustion phase in every speed band (subsonic/transonic/supersonic). Their "wet" thrust  is a result of   injecting fuel directly into the said hot exhaust stream behind the engine's turbine, using leftover oxygen to trigger a second combustion phase. This second combustion rapidly heats and expands the exhaust gases, forcing them out of a variable-geometry nozzle at a much higher velocity and therefore producing a much higher "wet thrust".

From my experiments with it, If you totally omit this setting it will be imposed by default (it is hard coded) and therefore one solution remains. To replace it with "MachLimitDry=ZZ" where "ZZ" is the value of  the "MachLimit=ZZ"entry which also  found in the [FlightControl] section. After this change the jet engine operation is normally restored and thrust modelling is then proper.
 

Edited 12 hours ago by alfa2

[Goob113870]

oh wow! Good catch. so all you have to do is a little editing then in the [FlightControl] section

[alfa2]

FYI We'll post replacement aircraft data .ini files for our recent uploads with Sophocles. Until then please just do the simple edit I've described above to the respective files. (Correct the MachLimitDry= value to be equal  to the value of the MachLimit=)

[Wrench]

Need to correct the statement in the original post -- it should read as:

"FlightControl section in the aircraft's Data ini"

simply because there's a whole lot of folks, new or otherwise,  that won't know where to look for it. Might want to also tell them, that if it's a stock bird, they'll need to extract the relevant data ini from whichever CAT it's in, and place it INTO said aircraft's main folder.