Fuel burn in climb
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Fuel burn in climb
Talking about boeing 7' series (737, 767, 747).
I looked at their AOM's and it seem that there is no data on fuel burn in climb (only N1 in climb). All there is - for long range cruise control perfomance (http://img359.imageshack.us/img359/7...fomancevl0.jpg). So how climb burn is calculated, especially with taking gross weight into account?
I looked at their AOM's and it seem that there is no data on fuel burn in climb (only N1 in climb). All there is - for long range cruise control perfomance (http://img359.imageshack.us/img359/7...fomancevl0.jpg). So how climb burn is calculated, especially with taking gross weight into account?
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Boeing Flight Planning & Performance Manuel (http://www.b737.org.uk/perf_climb.gif)
Airbus FCOM 2 & 3
Airbus FCOM 2 & 3
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Thank you, that's exactly what i need (at least for 737)! However iam steel confused why it is not published in aom or other related document like qrh or flight crew training manual.
747 Classic is close enough to ten tonnes from takeoff to top of climb. AS mentioned, the burn varies quite a lot from ground to cruise. Something like 33 tonnes/hr on takeoff up to 13 tonnes/hr for a heavy cruise.
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I can supply
I have a set of "norms" for the 744. I can distill these into a spreasheet quite easily.
For the a/c I know a look out the window, figures from the loadsheet and put the two together. Bingo. Yes, you do need some kind of ready reckoner in case one day the gremlin strikes.
I don't need to rehearse the usual caveats. If this will do either post or drop me a line.
For the a/c I know a look out the window, figures from the loadsheet and put the two together. Bingo. Yes, you do need some kind of ready reckoner in case one day the gremlin strikes.
I don't need to rehearse the usual caveats. If this will do either post or drop me a line.
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747 Classic is close enough to ten tonnes from takeoff to top of climb. AS mentioned, the burn varies quite a lot from ground to cruise. Something like 33 tonnes/hr on takeoff up to 13 tonnes/hr for a heavy cruise.
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I think you are missing something
Exact figures? They don't exist till you've flown it but estimates and rules of thumb can be helpful.
Have a word with your engineering ops dept and they'll explain.
Figures for what BRW, Initial Climb to where, Temp?? Here is one variant of the 744. No noise restrictions, radical departure. [Doesn't happen, EVER].
Anyway try this. Climb to FL330. 'Valid' for BRW 340->400T.
Distance ~ (0.6BRW-110) ISA; (0.6BRW-105) ISA+10; (1.1BRW-245) ISA+20
Time~ (0.1BRW-20) ISA; (0.1BRW-19) ISA+10; (0.15BRW-30) ISA+20
Fuel~ (35BRW-5600) ISA; (35BRW-5200) ISA+10; (50BRW-9500) ISA+20
In case I have mistyped a first guess goes as follows. Say BRW = 386T. Estimates are then 122nm, 127nm, 180nm to T/C at FL330 at ISA, ISA+10, ISA+20 respectively.
Similarly time 19, 20, 28 mins respectively.
Fuel 7910kg, 8310kg, 9800kg which you can work out as being 2.05%, 2.15%, 2.54% of BRW respectively.
In general the smaller the aircraft the higher the %age BRW is burnt in climb but the gross figure naturally is smaller.
Have a word with your engineering ops dept and they'll explain.
Figures for what BRW, Initial Climb to where, Temp?? Here is one variant of the 744. No noise restrictions, radical departure. [Doesn't happen, EVER].
Anyway try this. Climb to FL330. 'Valid' for BRW 340->400T.
Distance ~ (0.6BRW-110) ISA; (0.6BRW-105) ISA+10; (1.1BRW-245) ISA+20
Time~ (0.1BRW-20) ISA; (0.1BRW-19) ISA+10; (0.15BRW-30) ISA+20
Fuel~ (35BRW-5600) ISA; (35BRW-5200) ISA+10; (50BRW-9500) ISA+20
In case I have mistyped a first guess goes as follows. Say BRW = 386T. Estimates are then 122nm, 127nm, 180nm to T/C at FL330 at ISA, ISA+10, ISA+20 respectively.
Similarly time 19, 20, 28 mins respectively.
Fuel 7910kg, 8310kg, 9800kg which you can work out as being 2.05%, 2.15%, 2.54% of BRW respectively.
In general the smaller the aircraft the higher the %age BRW is burnt in climb but the gross figure naturally is smaller.
