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Fuel Flight Planning
Posted: 28 May 2006, 14:50
by Chris Trott
Okay, started a new thread to make it clean for just the numbers that people have found for use in flight planning for each aircraft type we operate. As a suggestion, I'd like to see each post titled with the name of the aircraft the fuel planning for and the following information -
Aircraft - (Restate from title)
First Hour Fuel - (Figure includes taxi, climb, and initial cruise)
Subsequent hour Fuel - (Cruise fuel consumption at standard cruise altitude, please specify what altitude you use)
Normal arrival fuel - (45 minutes of flying plus alternate fuel of at least 20 minutes flying time)
HS.748 Srs.2A
Posted: 28 May 2006, 14:52
by Chris Trott
Aircraft - Hawker Siddley HS.748 Srs.2A
First Hour - 1400lbs / 635kg
Subsequent Hours - 700lbs / 318kg (at 16,000 feet)
Normal arrival fuel - 1800lbs / 816kg
Vanguard 951/953
Posted: 28 May 2006, 14:55
by Chris Trott
Aircraft - Vickers Vanguard 951/953
First Hour - 4800lbs / 2180kg
Subsequent Hour - 4410lbs / 2000kg (at 20,000 feet)
Normal arrival fuel - 5000lbs / 2268kg
Posted: 28 May 2006, 19:29
by Avant-Garde-Aclue
With regards to the Vanguard:
Using your figures a 3 hour flight would take 6351 Kg, leaving a landing load of 2268Kg. However a 2 hour 40 minute flight, cruising at 22500 used 8864 Kg out of a 9000Kg fuel load.
Posted: 28 May 2006, 22:13
by Chris Trott
2.6 hours using my figures -
1 hour at 2087kg
1.6 hours at 998kg = 1596.8
Alternate/Arrival fuel of 2268kg
Total - 6000kg (rounded up)
That is per the fuel flows I viewed during a 1 hour flight including 40 minutes at cruise to attain my first hour's cruise from an MTOW departure, direct climb to FL200, and then cruise at FL200 and 12,500 RPM (per the manual) with Fuel Trim at 100%. All conditions were ISA as well so that may give some change, but in my experience it shouldn't be enough to cause that much of a difference.
Posted: 29 May 2006, 00:25
by Chris Trott
I have just revised the first hour number slightly from a more detailed examination of my departure from Gatwick for Rome. I burned an additional 200 pounds than the first, however this time I'm cruising at FL230, and although the climb probably used more fuel, it shouldn't be that much difference, so most of it is due to ISA deviation flying with real-world conditions.
Posted: 29 May 2006, 00:45
by Avant-Garde-Aclue
Just flown EGLL- LICC a flight of 3 hours 15 minutes no weather conditions used total fuel used 11506kg out of a total of 12000kg cruising at 20500. 12,500 rpm.
Posted: 29 May 2006, 01:06
by Chris Trott
I know what you have wrong.
You did't modify the Aircraft.CFG per Fraser's instructions.
You need to ensure you have Fraser's panel and then you have to make several modifications to the Aircraft.CFG file, including changing the fuel flow scalar. The reason your fuel consumption is so high is because you have the default scalar.
Posted: 29 May 2006, 01:49
by TSR2
Chris,
Could you post the details of Frasers Mod please. Might help a few of us.
Cheers,
Posted: 29 May 2006, 02:16
by Chris Trott
Per the Vanguard Cockpit Manual included with Fraser's panel, in the section labelled "MUST READ"-
Commence each session with a complete engine start .
Do not alter keyboard/joystick propeller controls from their maximum, 100% setting.
Do not alter the keyboard/joystick mixture settings.
The correct Fuel Trim setting for takeoff and go around must be set.
Move the inverter switches on the overhead rear panel to 1 and 2 respectively.
In order for the Fuel system to work properly the aircraft.cfg must be adjusted:
Open the Aircraft folder in FS9;
Open the Vickers Vanguard folder within;
Open the Aircraft.cfg file;
Scroll down until reaching the [GeneralEngineData] section;
Find the line which says:
fuel_flow_scalar
Edit this to read:
fuel_flow_scalar=0.61
Additionally find the [Flaps. 0] section, and edit the settings from
flaps-position.0= 0.000, 0.000
flaps-position.1= 7.000, 0.000 to read flaps-position.1= 10.000, 0.000
flaps-position.2= 10.000, 0.000 to read flaps-position.2= 20.000, 0.000
flaps-position.3= 27.000, 0.000 to read flaps-position.3= 30.000, 0.000
flaps-position.4= 47.000, 0.000 to read flaps-position.4= 40.000, 0.000
In order for ADF2 to function ensure the [Radios] section reads as follows:
[Radios]
// Radio Type=available, standby frequency, has glide slope
Audio.1=1
Com.1=1, 0
Com.2=1, 0
Nav.1=1, 0, 1
Nav.2=1, 0, 1
Adf.1=1
Adf.2=1
Transponder.1=1
Marker.1=1
The ADF2 section may need to be added
Save and exit.
For ease, I copied the entire section, but the important one pertaining to the fuel system is emboldened.
