kardeck 0 Posted March 16, 2012 Report Share Posted March 16, 2012 What is the formula for fuel burn for imported aircraft? Is there an easy way to work it out? Link to post Share on other sites
allardjd 1,853 Posted March 16, 2012 Report Share Posted March 16, 2012 DETERMINING FUEL CONSUMPTION There are at least three ways to get fuel consumption info... 1) Look it up on line. It's a statistic that's often difficult to find, but sometimes you get lucky. 2) If you know the range, cruise speed and fuel capacity you can work it out. You divide range by cruise speed to get endurance, then divide fuel capacity by endurance. That will get you there. The result will probably be a little rough, but good enough for AH. 3) Fly the plane in FS in a non-AH flight. Climb to a typical cruise altitude and set a typical cruise power setting. Using the panel clock as a time reference... Open the Fuel & Payload menu... Top Line Menu -> Aircraft -> Fuel & Payload Read the fuel quantity from the F & P menu Return to the sim When exactly 10 minutes has elapsed by the panel clock go back to the F & P menu and read the fuel quantity again. Subtract the two to determine how much you burned in ten minutes. Multiply that by six to determine how much you will burn in an hour. Note that this will be in pounds and AH wants the fuel consumption in US gallons. To convert pph to USG/hr... If Jet A divide by 6.7 If 100LL divide by 6.0 Note that the fuel consumption value that you enter in AH does not affect the way the aircraft performs in FS. AH uses that value for job generation, AH scheduling, etc - only things internal to AH. Note also that fuel burn is NOT affected by AC weight, only by density altitude and power setting. Speed will vary with AC weight, but fuel burn will not if the power setting remains constant. Link to post Share on other sites
kardeck 0 Posted March 17, 2012 Author Report Share Posted March 17, 2012 That seems straight forward - can you double check my math? Handley Page Hermes, (r. 1735 nm / c. 234 kts) / (usg. 3480 / h. 7.5) = fuel burn of 464? Link to post Share on other sites
allardjd 1,853 Posted March 17, 2012 Report Share Posted March 17, 2012 That's about 116 gph per engine, which strikes me as a little on the high side. If you want to take the time to use the third method it will be much more accurate, but what you have is usable. You can always edit what you put in AH after a flight or two, when you have a better idea what the actual burn works out to be in FS. John Link to post Share on other sites
SEATAC 400 Posted March 17, 2012 Report Share Posted March 17, 2012 I don't know if your particular aircraft will be on here, but I use this all the time to plan my fuel load. It's quite accurate. http://fuel.aerotexas.com/ Link to post Share on other sites
kardeck 0 Posted March 17, 2012 Author Report Share Posted March 17, 2012 Thans SEATAC, but can you explain what I am looking at? I run a Saab 340 between KOFF and KFAR. What is the fuel load? Im a bit confused. ===================================================================== L O A D S H E E T CHECKED APPROVED EDNO 15835 ALL WEIGHTS IN LBS DATABASE NOV/10 // SAAB 340B FROM/TO FLIGHT A/C-REG VERSION CREW DATE TIME KOFF/KFAR 5224 __ERH 10JN1 2/03 17MAR12 0607 WEIGHT DISTRIBUTION LOAD IN COMPARTMENTS 000788 B26/30 PASSENGER/CABIN BAG 005460 Y028/195 EFU.1054/ RSV.1172 TOTAL TRAFFIC LOAD 006248 DRY OPERATING WEIGHT 019000 ZERO FUEL WEIGHT ACTUAL 025248 MAX 23000 TAKE OFF FUEL 002226 TAKE OFF WEIGHT ACTUAL 027475 MAX 29000 TRIP FUEL 001054 LANDING WEIGHT ACTUAL 026421 MAX 28500 ++--------------------------------+ | LAST MINUTE CHANGES | | DEST SPEC CL/CPT + - WEIGHT | | | | | | | +---------------------------------+ UNDERLOAD BEFORE LMC 1524 LMC TOTAL + - --------------------------------------------------------------------- SI BLOCK TIME 01:14 RESERVE 01:22 TIME TO EMPTY 02:36 CI 56 SI KOFF 171155Z AUTO 14009KT 10SM CLR 17/15 A2979 SI KFAR 171153Z 17008KT 7SM CLR 11/08 A2961 END LOADSHEET [ SF34 ] [ KOFF-KFAR ] [ 17MAR12 ] ===================================================================== FUELPLAN² Copyright 2008-2010 by Garen .AT. AeroTexas .DOT. com Link to post Share on other sites
hurricanemk1c 195 Posted March 17, 2012 Report Share Posted March 17, 2012 As far as I know it's this: TAKE OFF FUEL 002226 Link to post Share on other sites
SEATAC 400 Posted March 17, 2012 Report Share Posted March 17, 2012 Takeoff fuel is the number you need to look at. It includes fuel for alternate and holding, as required in case you have to divert or hold to land. 2,226 pounds of fuel at takeoof is what that is showing. I usually select the 'plan and load' option. It is a bit easier to read. Link to post Share on other sites
allardjd 1,853 Posted March 17, 2012 Report Share Posted March 17, 2012 I thought he was looking for a pph/gph value to plug into AH for an imported AC, not the amount of fuel required for a specific flight. John Link to post Share on other sites
kardeck 0 Posted March 17, 2012 Author Report Share Posted March 17, 2012 John, both (in the end!). Your advice led to Seatac posting the link to a flightsim fuel planner - I didnt want to start another thread for my question about that. Link to post Share on other sites
kardeck 0 Posted March 22, 2012 Author Report Share Posted March 22, 2012 Using the formula above (divide range by cruise speed to get endurance, then divide fuel capacity by endurance), I have come up with the following list for a/c I am using in AH. The figures are based on freeware a/c I downloaded from various sources. I hope they may be of use. BAE 146-100 794 Douglass DC-7C 505 Handley Page Hermes-4 424 Bristol Britania-100 501 Lockheed Hercules-K 847 Lockheed Hercules-J 495 Boeing 727-200 1692 Boeing 737-800 1034 Boeing 757-200 1618 Embraer 120-ER 256 Embraer 190-LR 854 NAMC YS-11 220 Learjet 60 189 Saab 340-B 242 Beechcraft 1900-D 223 Fokker F-100 1117 Link to post Share on other sites
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