Bingo 3 Posted March 31 Share Posted March 31 I generally like to fly the following PMDG aircraft: B747-8 Freighter B737-700 Freighter B777F I have PFPX profiles for all three A/C, but I would like to obtain fuel bias and drag bias for all three planes. I have not been successful at calculating accurate fuel loading versus actual flight plan results. Any ideas on where to get this data? BTW, is there are bias information available I need to enter into the PFPX aircraft configuration files to improve flight fuel burn results? Bill Clark Link to post Share on other sites
phil747fan 51 Posted April 1 Share Posted April 1 you may need to do some experiment in different phase of flights. the older version of 744 and f were off by 10%. Link to post Share on other sites
Bingo 3 Posted April 3 Author Share Posted April 3 Phillippe, I was hoping that someone, or others had already analyzed one or more of these three aircraft as to fuel bias and drag bias? Bill Link to post Share on other sites
Dan Cowsill 0 Posted April 3 Share Posted April 3 You can use the Aircraft Performance Monitoring (APM) function in the aircraft database to determine fuel and drag biases for any aircraft using data obtained in flight. Plan and start a new flight and once you get to cruise altitude, double-click the aircraft you're flying in the aircraft database, click APM, then enter the required fields. FF/hr can be calculated by using the engine performance, adding together the FF figure for all engines and multiplying by 1000. All the other fields can be found directly in either the FMC (gross weight) or on the flight displays (altitude/FL, TAS, GS). You can enter data from multiple flights over time to build up an accurate profile. Link to post Share on other sites
VHOJT 45 Posted April 6 Share Posted April 6 I will have a look tomorrow for the 77F figures I use. Note that these were before PMDG updated the 777, which now correctly burns differently depending on ISA deviation. The figures I have for it are for the default 77F profile where I took all ISA deviation burn changes out of the profile. So in theory, it should be a reasonable number. Link to post Share on other sites
Mr.Eurocup 0 Posted Thursday at 06:47 PM Share Posted Thursday at 06:47 PM for the PMDG 747-400ER/F i use 'FlyPrecisely' profile with this settings that work very well for me Takeoff burn: 500kg Approach burn: 1000kg Takeoff time: 0 Approach time: 2 Drag bias 0.0% to (minus)-0.1% LRC: FF bias 0.0% Ci 350 to 999 : FF 0.0% as a rule of thumb i decrease FF by -0.1% per 10 Ci less than Ci 350 ( e.g. Ci 340=FF -0.1 % ; Ci 330=FF -0.2% ; Ci 300=FF -0.5% ; Ci 200=FF -1.5% ; Ci 100= -2.5% etc ) Ci 0 : FF (minus)-3.5% its quite accurate until PFPX want me to fly 2000ft below the FMC OPT Altitude then everything goes crazy by losing or gaining 200-400kg/h Link to post Share on other sites
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