Hi,The fuel flow on a lot of MS airplanes is usually way off. I was wondering if there was a way to tweak it to make it more realistic, or is the code buried in FS.Thanks.

In each aircraft's main folder there is a file named, Aircraft.cfg. If you look in the section titled "GeneralEngineData" you will find a variable called, "fuel_slow_scalar". To quote directly from the FS9 SDK,"Scalar for modifying the fuel flow required by the engine(s). A value of less than 1.0 causes a slower fuel consumption for a given power setting, a value greater than l.0 causes the aircraft to burn more fuel for a given power setting".The same variable exists in FSX aircraft so I think it's safe to assume the above also applies.Cal

I matched up the PMDG 744 to a real world 744 flight from London to LA. The PMDG airplane's FMC calculated fuel flow to within 1000 lbs of the real airplane's 250K+ burn. Pretty amazing. A test flight would have proved nothing because MSFS does not have the atmospheric detail to allow real world 'proving' flights. That addons provide capabilities that are are WAY beyond what FS9 can support. In particular, the addons (at least this one) are very good in modeling FF charactoristics. The MSFS default airplanes were never meant to be anthing more than a great way to zoom around and have fun in the sim. They do a great job for their intended purpose. But if you want fidelity, you'll need to get one of these terrific 3rd party addons.

Thanks for the reply.The reason I asked was I have a couple of 3rd party aircraft, F-104 and F4, and I can fly in burner forever. I flew the F4 from ACY to JFK in burner, and the fuel showed 85% remaining! I'm sure FS was never designed to deal w/ M2 fighters, but just wanted to tweak it some.