744 Fuel Burn
Joined: Jul 2004
Posts: 513
Likes: 0
From: Sydney NSW
that's fair
Good figures. I still have all the gen on my home computer. Give me what you think is a typical route, load, speed and I can supply the data. Mrs "E" would be happy to clear out the loft by the way. Just pm with the specifics. If you are Excel literate so much the better.
Joined: Jul 2004
Posts: 513
Likes: 0
From: Sydney NSW
Did I goof?
I read it as a fairly bland question and assumed the questioner would expect nothing too refined by way of an answer.
In my former airline with the engines we fitted. ISA conditions, 240 tonne landing weight, air distance 3800nm to 5800nm (which spans roughly 8-12hrs) my estimate of fuel burnout for cruise in the M0.85-0.86 region is 9.80-10.40 tonnes per hour averaged over the whole or 78 to 125 tonnes burnout if you prefer. A climb to FL330 optimum I’d expect to consume somewhere between 6 and 8 tonnes if it is a smooth uncomplicated departure with 16-24minutes to settle at 2600-2800kg/hr/engine in first cruise for a good revenue earning payload. Supposing FL370 top of the drop and 240 tonne touch-down I’d expect pretty close to 2100kg/hr/engine final cruise. We can discuss reserves, holding etc too but I doubt that the original questioner wanted any more than a one line answer and hasn't come back for more Someone swotting up would certainly want more detail and look for a mate in eng ops to supply and not put their trust in an anonymous forum.
Best rgds
The "E"
Please don't shoot, I'm only the messenger!
In my former airline with the engines we fitted. ISA conditions, 240 tonne landing weight, air distance 3800nm to 5800nm (which spans roughly 8-12hrs) my estimate of fuel burnout for cruise in the M0.85-0.86 region is 9.80-10.40 tonnes per hour averaged over the whole or 78 to 125 tonnes burnout if you prefer. A climb to FL330 optimum I’d expect to consume somewhere between 6 and 8 tonnes if it is a smooth uncomplicated departure with 16-24minutes to settle at 2600-2800kg/hr/engine in first cruise for a good revenue earning payload. Supposing FL370 top of the drop and 240 tonne touch-down I’d expect pretty close to 2100kg/hr/engine final cruise. We can discuss reserves, holding etc too but I doubt that the original questioner wanted any more than a one line answer and hasn't come back for more Someone swotting up would certainly want more detail and look for a mate in eng ops to supply and not put their trust in an anonymous forum.
Best rgds
The "E"
Please don't shoot, I'm only the messenger!
