Topic Author
Posts: 371
Joined: Fri Oct 27, 2006 11:01 am

FS--excessive Fuel Consumption

Sun Apr 29, 2007 2:45 pm

Everytime i do a flight, i check the nav log, where they give an estimated amount of fuel consumpiton. However, when i am done wiht the flight i ususally have used nearly double the fuel. This is very frusttrating, as I have read the flight notes and maininatin the cruise speed in that same nav log.?? is this a game flaw or am i doing something wroing//??

Also a little of topic, but does Fsx have the landme function aka an autopilot setting that takes the plane down to 400 feet ?? If so can someone plz briefly explain how to use it??

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Joined: Thu Aug 04, 2005 11:00 pm

RE: FS--excessive Fuel Consumption

Sun Apr 29, 2007 6:46 pm

Many standard and some add on models have wrong fuel consumption , this can be changed by increasing the fuel_flow_scalar setting in the aircraft.cfg file when consuming too little or decreasing this setting when consuming too much .
Before you do this first be aware that the expected fuel consumption in the nav log does not take into account:
-fuel reserve that still has to be there when you landed and docked on the gate (ex. +/- 15% with B747)
-fuel needed for taxi from gate to runway (747 +/- 10000 pound on big airport with traffic)
-fuel needed for taxi from runway to gate when arrived (747 +/- 5000 pound on big airport with traffic)
-Extra fuel consumed during take off and climb stage.
-Compensation for headwind when usually flying westbound (this can be a considerable amount of extra fuel on longer flights with lots of headwind).
-Difference in extra fuel consumption when near MTOW.

All these parameters should be added extra to the proposed fuel level consumption given in the nav log.

Quoting Detroitflyer (Thread starter):
Also a little of topic, but does Fsx have the landme function aka an autopilot setting that takes the plane down to 400 feet ?? If so can someone plz briefly explain how to use it??

I don't use FSX up until now but the ILS landing function you talk about should be about the same as in FS2002 and FS2004, first get the course setting and more importantly the ILS frequency for the runway you have been assigned to land on (available in standard map by clicking on the airport and go to the runway you need).
-Fill in these values in the NAV1 radio (freq) and the course setting in CRS1 on your AutoPilot.
-Switch NAV/GPS button to NAV.
-Descent to Approach height as given by the ATC (usually about 2000ft above AGL).
-Switch on Nav1 radio ,when within range (About 20-30 miles out) you will hear an intermediate beeping noise meaning the ILS frequency is active.
-At about 6-8 miles out usually at about 30° off heading towards the runway and 2000ft AGL switch on APP (approach)
on the AP, after a while Your HDG and ALT button will automatically disengage and the plane will automatically start seeking the middle of the ILS beam by slowly descending and turning towards the runway.
-check speeds and set flaps accordingly , set autobrake , arm spoilers and lower Gear.
-your all set for landing.
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RE: FS--excessive Fuel Consumption

Sun Apr 29, 2007 8:04 pm

Arnie hit the nail on the head with the fuel consumption.

The "landme" function I think was only in FS98 and was accessed from a dropdown menu, it was not built into the autopilot and was as if another pilot would take the controls and bring the aircraft down. I do believe an ILS frequency was required though, it was not an autoland function though. I haven't used FS98 in years and I shoot all my approaches properly these days  Smile

If you are having trouble landing though, you could use the "Red Squares" to guide you in, you would need to tune NAV 1 to the appropriate ILS frequency, when its alive (you get a DME or heading reference), there is a setting under "Flight - Navigation", there is a setting (I can't remember the exact one) but you can select to have red boxes appear in the air along the centreline and glideslope, as long as you fly through each box you will land right on the runway. Its a great tool for people who are learning IFR, transitioning across to reading your own instruments (rather than the "Heads up display" as it could be called) is a fairly simple step afterwards. Its getting used to landing without seeing the runway until late in the approach which is the hard part  Smile

Lifes a train racing towards you, now you can either run away or grab a chair & a beer and watch it come - Phil
Posts: 2051
Joined: Sat Apr 23, 2005 2:38 am

RE: FS--excessive Fuel Consumption

Mon Apr 30, 2007 1:05 am

On 777 Professional, I frequently find the flight computer overestimates the fuel use. During a long flight, I notice how the point of step climb keeps on getting pushed back as it takes longer to loose weight than thought.

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