More about the BAC: fuel calculation - how?

[Independance]

Hi Tomasz and welcome to our humble abode ;-)

ATB

DaveB :tab:

Hello Dave ;-)

I knew about this site for a long time, but joined not until today ;-)

Now glad to be with You all.

Best Regards
Tomasz

[Sebastian]

Hello

If You look on my web page in Tools section, You will find quite accurate fuel figures for David's superb 1-11.

Best Regards
Tomasz

Sorry, of course, I am very interested in these figures, but where is that tool-section? Do you mean the FSairlines-link in your sig? But they don`t have a tool-section (used the guest-log-in). Could you post a proper link to that files, please? :tonqe:

[Independance]

...but where is that tool-section?...

Hi

In my profile, click that small Earth logo, then You will find it :tab:

Best Regards
Tomasz

[Sebastian]

All right, but I still have some questions.

Until now, I just had a quick look at your figures and I don`t find the relationship of flight level and fuel use. How can I use the usage per hour with different flight levels like FS 180 or FL 320? That would certainly make huges differences, wouldn`t it?

[DaveB]

Hi Sebastian

I've not looked at the figures Tomasz has produced but I see what you mean. If you're flying to a given IAS, your fuelburn would be higher at FL180 than it would be at FL320 but there are other things to be taken into consideration.. mainly your groundspeed. You're looking at an aircraft with a duration of what, 3hrs pushing it so in a lot of cases.. the extra groundspeed gained by going higher can be written off by the amount of time (and extra fuel) it takes to get there. NigelC posted a fair (and real world) figure he used on the real thing (as a rule of thumb) and it worked out pretty well

ATB

DaveB :tab:

[Independance]

All right, but I still have some questions.

Until now, I just had a quick look at your figures and I don`t find the relationship of flight level and fuel use. How can I use the usage per hour with different flight levels like FS 180 or FL 320? That would certainly make huges differences, wouldn`t it?

Hi

No, my figures reflect usage on highest possible level on particural route. This is a jet no matter old one, going higher burns less.

Basically if You fly on route more than 200NM, You always should climb to around 30000ft.

Climb to initial FL300/310, accelerate using climb speed to Ma 0.74, then shallow climb to FL340/FL350. If You are lighter than 44500kg, if speed is no less than Ma 0.7 and if distance permits climb to FL360/FL370.

Flying a jet on long distance at low levels is a waste of time and fuel, something never done in reality.

Best Regards
Tomasz